TWI492402B - Solar cell and module comprising the same - Google Patents
Solar cell and module comprising the same Download PDFInfo
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- TWI492402B TWI492402B TW102119946A TW102119946A TWI492402B TW I492402 B TWI492402 B TW I492402B TW 102119946 A TW102119946 A TW 102119946A TW 102119946 A TW102119946 A TW 102119946A TW I492402 B TWI492402 B TW I492402B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Description
本發明是有關於一種電池及其模組，特別是指一種太陽能電池及其模組。The invention relates to a battery and a module thereof, in particular to a solar battery and a module thereof.
參閱圖1、2，一般太陽能電池通常包含：一基板91、一位於該基板91的一正面92處之內的射極層94、一配置於該基板91的一背面93上的鈍化層95、一配置於該基板91的正面92而接觸該射極層94的正電極單元96，以及數個配置於該鈍化層95上且過穿該鈍化層95而接觸該基板91的背電極單元97。Referring to FIGS. 1 and 2, a general solar cell generally includes a substrate 91, an emitter layer 94 located at a front surface 92 of the substrate 91, and a passivation layer 95 disposed on a back surface 93 of the substrate 91. A positive electrode unit 96 disposed on the front surface 92 of the substrate 91 to contact the emitter layer 94, and a plurality of back electrode units 97 disposed on the passivation layer 95 and passing through the passivation layer 95 to contact the substrate 91.
該基板91的正面92為受光面，該基板91與該射極層94透過半導體製程技術形成PN接面，為光伏特效應的來源。該正電極單元96包括數個正面匯流電極961(圖中僅示其一)，以及數個連接該數個正面匯流電極961的指狀電極962。該背電極單元97包括數個配置於該鈍化層95上的背面匯流電極971，以及一個配置於該鈍化層95上且穿過該鈍化層95而接觸該基板91的背電極972，該背電極972接觸該數個背面匯流電極971。The front surface 92 of the substrate 91 is a light receiving surface, and the substrate 91 and the emitter layer 94 form a PN junction through a semiconductor process technology, which is a source of photovoltaic specific effects. The positive electrode unit 96 includes a plurality of front side bus electrodes 961 (only one of which is shown), and a plurality of finger electrodes 962 that connect the plurality of front side bus electrodes 961. The back electrode unit 97 includes a plurality of back surface bus electrodes 971 disposed on the passivation layer 95, and a back electrode 972 disposed on the passivation layer 95 and contacting the substrate 91 through the passivation layer 95. The back electrode 972 contacts the plurality of backside bus electrodes 971.
在製造上，該數個正面匯流電極961、該數個指狀電極962與該數個背面匯流電極971分別可透過網印 導電漿料而形成，但由於導電漿料的材料主要為銀(Ag)而價格昂貴，再加上該數個正面匯流電極961與該數個背面匯流電極971一般皆印製成一整條連續的線狀體，所以導電漿料的用量大而增加製造成本。因此，若能減少該數個正面匯流電極961或該數個背面匯流電極971的面積，以減少導電漿料的消耗，將可降低製造成本。In manufacturing, the plurality of front bus electrodes 961, the plurality of finger electrodes 962, and the plurality of back side bus electrodes 971 are respectively screen-printable The conductive paste is formed, but since the material of the conductive paste is mainly silver (Ag) and expensive, the plurality of front side bus electrodes 961 and the plurality of back side bus electrodes 971 are generally printed as a whole continuous The linear body, so the amount of the conductive paste is large to increase the manufacturing cost. Therefore, if the area of the plurality of front side bus electrodes 961 or the plurality of back side bus electrodes 971 can be reduced to reduce the consumption of the conductive paste, the manufacturing cost can be reduced.
另一方面，太陽能電池製作完成後，通常會將數個太陽能電池與其它構件封裝成為太陽能電池模組。其中，該數個太陽能電池之間必須藉由焊接數個焊帶導線(Ribbon)來使彼此電連接。具體而言，每一個焊帶導線連接其中一個太陽能電池的正面匯流電極961，且該焊帶導線還連接相鄰的另一個太陽能電池的背面匯流電極971。On the other hand, after the solar cell is manufactured, several solar cells and other components are usually packaged into a solar cell module. Wherein, the plurality of solar cells must be electrically connected to each other by soldering a plurality of ribbon wires (Ribbon). Specifically, each of the ribbon wires is connected to the front side bus electrode 961 of one of the solar cells, and the strip line is also connected to the back side bus electrode 971 of the adjacent other solar cell.
雖然改良該數個正面匯流電極961與該數個背面匯流電極971的結構以節省成本是一重要的課題，但同時也需要考慮所述焊帶導線分別與該數個正面匯流電極961或該數個背面匯流電極971之間的焊接結合拉力。若為了節省成本，而一味地減少該數個正面匯流電極961與該數個背面匯流電極971的導電漿料之用量，將會減少前述電極與焊帶導線的接觸面積，則在封裝模組時容易發生焊帶導線脫落的問題，進而降低製造良率與使用可靠性。Although it is an important issue to improve the structure of the plurality of front side bus electrodes 961 and the plurality of back side bus electrodes 971 to save costs, it is also necessary to consider the strip conductors and the plurality of front side bus electrodes 961 or the number. The welding between the back side bus electrodes 971 is combined with the pulling force. If the amount of the conductive paste of the plurality of front side bus electrodes 961 and the plurality of back side bus electrodes 971 is reduced in order to save cost, the contact area between the electrodes and the strip conductors is reduced, and when the module is packaged The problem of the drop of the ribbon is prone to occur, thereby reducing the manufacturing yield and the reliability of use.
因此，本發明之目的，即在提供一種可節省導電漿料以降低製造成本，並具有良好的製造良率與使用可靠性的太陽能電池及其模組。Accordingly, it is an object of the present invention to provide a solar cell and a module thereof which can save conductive paste to reduce manufacturing cost and have good manufacturing yield and reliability.
於是，本發明太陽能電池，包含：一基板、一射極層、一第一介電層、一正電極及一背電極。該基板包括彼此相對的一正面及一背面，該射極層配置於該正面處，該第一介電層位於該正面上，該正電極位於該第一介電層上，並穿過該第一介電層而接觸該射極層，而該背電極位於該背面上，並包括數個以二維陣列方式排列的第一導電部，且該數個第一導電部彼此之間分別包圍出數個鏤空部。Thus, the solar cell of the present invention comprises: a substrate, an emitter layer, a first dielectric layer, a positive electrode and a back electrode. The substrate includes a front surface and a back surface opposite to each other, the emitter layer is disposed at the front surface, the first dielectric layer is located on the front surface, and the positive electrode is located on the first dielectric layer and passes through the first a dielectric layer is in contact with the emitter layer, and the back electrode is located on the back surface, and includes a plurality of first conductive portions arranged in a two-dimensional array, and the plurality of first conductive portions are respectively surrounded by each other Several hollows.
本發明太陽能電池模組，包含：一第一板材與一第二板材、至少一個如前述且設置於該第一板材與該第二板材間的太陽能電池，以及一位於該第一板材與該第二板材間並接觸該太陽能電池的封裝材。The solar cell module of the present invention comprises: a first plate and a second plate, at least one solar cell disposed between the first plate and the second plate, and a first plate and the first plate The two sheets are in contact with the packaging material of the solar cell.
本發明之功效在於：將該背電極分隔成以二維陣列式排列的該數個第一導電部的創新結構設計，在節省導電漿料以降低製造成本的同時，還能增加該數個第一導電部在焊接時與焊帶導線的接觸面積，因而有助於提升兩者之間的焊接結合力與支撐力，並在封裝模組時焊帶導線能穩固地結合而不易脫落，故可提升焊接作業時的製造良率與使用可靠性。The utility model has the advantages that the back electrode is divided into the innovative structural design of the plurality of first conductive portions arranged in a two-dimensional array, and the conductive paste is saved to reduce the manufacturing cost, and the plurality of the first The contact area of a conductive portion with the wire of the solder ribbon during soldering helps to improve the solder bonding force and the supporting force between the two, and the soldering wire can be firmly combined and not easily fall off when the module is packaged, so Improve manufacturing yield and reliability during welding operations.
1‧‧‧第一板材1‧‧‧ first plate
2‧‧‧第二板材2‧‧‧Second plate
3‧‧‧太陽能電池3‧‧‧Solar battery
31‧‧‧基板31‧‧‧Substrate
32‧‧‧正面32‧‧‧ positive
33‧‧‧背面33‧‧‧Back
34‧‧‧射極層34‧‧ ‧ emitter layer
35‧‧‧第一介電層35‧‧‧First dielectric layer
36‧‧‧正電極36‧‧‧ positive electrode
361‧‧‧匯流電極361‧‧‧Concurrent electrode
362‧‧‧指狀電極362‧‧‧ finger electrode
37‧‧‧背電極37‧‧‧Back electrode
370‧‧‧電極組370‧‧‧electrode group
371‧‧‧第一導電部371‧‧‧First Conductive Department
372‧‧‧凸出段372‧‧‧ protruding section
373‧‧‧連接段373‧‧‧Connected section
374‧‧‧鏤空部374‧‧‧镂空部
375‧‧‧第二導電部375‧‧‧Second Conductive Department
376‧‧‧第三導電部376‧‧‧ Third Conductive Department
377‧‧‧局部背表面電場377‧‧‧Partial back surface electric field
379‧‧‧內周圍壁379‧‧‧ inner wall
38‧‧‧第二介電層38‧‧‧Second dielectric layer
381‧‧‧第一開孔381‧‧‧ first opening
382‧‧‧第二開孔382‧‧‧Second opening
39‧‧‧連接電極39‧‧‧Connecting electrode
4‧‧‧封裝材4‧‧‧Package
5‧‧‧焊帶導線5‧‧‧welding wire
81‧‧‧第一方向81‧‧‧First direction
82‧‧‧第二方向82‧‧‧second direction
本發明之其他的特徵及功效，將於參照圖式的實施方式中清楚地呈現，其中：圖1是一般太陽能電池的背面示意圖；圖2是圖1的太陽能電池的局部立體剖視圖，圖中該 太陽能電池之一背面朝上；圖3是本發明太陽能電池模組之一第一較佳實施例的局部剖視示意圖；圖4是該第一較佳實施例之一太陽能電池的背面示意圖；圖5是該太陽能電池之一局部立體剖視圖，圖中該太陽能電池之一背面朝上；圖6是沿圖4中線A-A所取之一局部側視剖視圖；圖7是一類似圖4的背面示意圖，說明該太陽能電池之數個第一開孔與數個第二開孔的另一實施態樣；圖8是一類似圖6的剖視圖，說明該太陽能電池之數個第一電極部與數個第二電極部的另一設置型態；圖9是本發明太陽能電池之一第二較佳實施例的局部背面示意圖；圖10是本發明太陽能電池之一第三較佳實施例的局部背面示意圖；圖11是本發明太陽能電池之一第四較佳實施例的局部背面示意圖；圖12是本發明太陽能電池之一第五較佳實施例的局部背面示意圖；圖13是本發明太陽能電池之一第六較佳實施例的局部背面示意圖；圖14是本發明太陽能電池之一第七較佳實施例的局部背面示意圖； 圖15是本發明太陽能電池之一第八較佳實施例的局部背面示意圖；圖16是本發明太陽能電池之一第九較佳實施例的局部背面示意圖；圖17是本發明太陽能電池之一第十較佳實施例的局部背面示意圖；圖18是本發明太陽能電池之一第十一較佳實施例的局部背面示意圖；及圖19是本發明太陽能電池之一第十二較佳實施例的局部背面示意圖。Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a schematic side view of a general solar cell; FIG. 2 is a partial perspective cross-sectional view of the solar cell of FIG. FIG. 3 is a partial cross-sectional view showing a first preferred embodiment of the solar cell module of the present invention; FIG. 4 is a schematic rear view of the solar cell of the first preferred embodiment; 5 is a partial perspective cross-sectional view of the solar cell, in which one of the solar cells faces upward; FIG. 6 is a partial side cross-sectional view taken along line AA of FIG. 4; FIG. 7 is a schematic view similar to FIG. Another embodiment of the first opening and the plurality of second openings of the solar cell is illustrated; FIG. 8 is a cross-sectional view similar to FIG. 6 illustrating a plurality of first electrode portions and a plurality of solar cells. FIG. 9 is a partial rear side view of a second preferred embodiment of the solar cell of the present invention; FIG. 10 is a partial rear view of a third preferred embodiment of the solar cell of the present invention; Figure 11 is a partial rear side view of a fourth preferred embodiment of the solar cell of the present invention; Figure 12 is a partial rear side view of a fifth preferred embodiment of the solar cell of the present invention; Figure 13 is a solar cell of the present invention; Local backside sixth preferred embodiment; and FIG. 14 is a schematic partial back surface of one of the seventh preferred embodiment of a solar cell according to the present invention; Figure 15 is a partial rear elevational view of an eighth preferred embodiment of the solar cell of the present invention; Figure 16 is a partial rear perspective view of a ninth preferred embodiment of the solar cell of the present invention; FIG. 18 is a partial rear perspective view of an eleventh preferred embodiment of the solar cell of the present invention; and FIG. 19 is a partial view of a twelfth preferred embodiment of the solar cell of the present invention; Schematic diagram of the back.
在本發明被詳細描述之前，應當注意在以下的說明內容中，類似的元件是以相同的編號來表示。Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.
參閱圖3，本發明太陽能電池模組之一第一較佳實施例包含：上下間隔的一第一板材1與一第二板材2、數個陣列式地排列於該第一板材1與該第二板材2之間的太陽能電池3，以及一位於該第一板材1與該第二板材2之間且接觸該數個太陽能電池3的封裝材4。當然在實施上，該太陽能電池模組可以僅包含一太陽能電池3。Referring to FIG. 3, a first preferred embodiment of the solar cell module of the present invention comprises: a first plate 1 and a second plate 2 spaced apart from each other, and arrayed on the first plate 1 and the array A solar cell 3 between the two sheets 2, and a package 4 between the first sheet 1 and the second sheet 2 and contacting the plurality of solar cells 3. Of course, in practice, the solar cell module may include only one solar cell 3.
在本實施例中，該第一板材1又稱為背板(Back Sheet)，該第二板材2位於光線入射的一側，其可由透光材料製成，例如玻璃或塑膠材質等板材，不需特別限制。該數個太陽能電池3彼此之間可透過數個焊帶導線5電連接。而該封裝材4的材料為乙烯-醋酸乙烯共聚物 (EVA)或其他可用於太陽能電池模組封裝之相關材料，並不限於本實施例的舉例。此處圖3係將該太陽能電池模組的該第一板材1朝上繪製，僅為配合繪製後續圖示時，將該數個太陽能電池3的背部朝上以便說明之故。由於該太陽能電池模組的結構非本發明改良的重點，不再說明，於圖3中也僅為簡單示意。此外，由於該數個太陽能電池3的結構都相同，以下僅以其中一個為例進行說明。當然，在一模組中的該數個太陽能電池3的結構不以相同為絕對之必要。In this embodiment, the first plate 1 is also referred to as a Back Sheet, and the second plate 2 is located on the side where the light is incident, and may be made of a light-transmitting material, such as a glass or plastic material. Special restrictions are required. The plurality of solar cells 3 are electrically connected to each other through a plurality of ribbon conductors 5. The material of the packaging material 4 is ethylene-vinyl acetate copolymer (EVA) or other related materials that can be used for solar cell module packaging are not limited to the examples of the embodiment. Here, in FIG. 3, the first sheet 1 of the solar cell module is drawn upward, and the backs of the plurality of solar cells 3 are directed upward for the sake of illustration. Since the structure of the solar cell module is not an improvement of the present invention, it will not be described again, and is also simply illustrated in FIG. In addition, since the structures of the several solar cells 3 are the same, only one of them will be described below as an example. Of course, the structure of the plurality of solar cells 3 in a module is not absolutely necessary.
參閱圖4、5、6，本實施例的太陽能電池3包含一基板31、一射極層34、一第一介電層35、一正電極36、一背電極37，及一第二介電層38。其中，設置有該第二介電層38時，此種形式之太陽能電池3即為Passivated Emitter and Rear Contact(簡稱PERC)之電池類型，即該太陽能電池3之背部有許多局部設置的背表面電場(Local Back Surface Field)，另外，若未設置有該第二介電層38時，即該太陽能電池3之背部整面皆為背表面電場設計之電池類型。4, 5, and 6, the solar cell 3 of the present embodiment includes a substrate 31, an emitter layer 34, a first dielectric layer 35, a positive electrode 36, a back electrode 37, and a second dielectric. Layer 38. Wherein, when the second dielectric layer 38 is disposed, the solar cell 3 of this type is a battery type of a Passivated Emitter and Rear Contact (PERC), that is, the back surface of the solar cell 3 has a plurality of locally disposed back surface electric fields. (Local Back Surface Field), in addition, if the second dielectric layer 38 is not provided, that is, the entire back surface of the solar cell 3 is a battery type designed with a back surface electric field.
該基板31可為p型或n型的晶矽基板，並可為單晶矽基板或多晶矽基板。該基板31包括一受光的正面32，以及一相對於該正面32的背面33。該射極層34配置於該正面32處之內，並與該基板31形成p-n接面。而該第一介電層35位於該正面32上且接觸該射極層34，其材料例如氮化矽(SiNx )等，用於提升光線入射量以及降低載子表面 複合速率(Surface Recombination Velocity，簡稱SRV)。由於本發明的改良不在於此，因此不再詳述。The substrate 31 may be a p-type or n-type crystal germanium substrate, and may be a single crystal germanium substrate or a polycrystalline germanium substrate. The substrate 31 includes a light-receiving front side 32 and a back side 33 opposite the front side 32. The emitter layer 34 is disposed within the front surface 32 and forms a pn junction with the substrate 31. The first dielectric layer 35 is located on the front surface 32 and contacts the emitter layer 34. The material thereof is, for example, tantalum nitride (SiN x ), etc., for increasing the incident light amount and reducing the surface recombination velocity of the carrier (Surface Recombination Velocity) , referred to as SRV). Since the improvement of the present invention is not here, it will not be described in detail.
該正電極36位於該第一介電層35上，並穿過該第一介電層35而接觸該射極層34。該正電極36包括至少一個匯流電極361，以及數個連接該匯流電極361的指狀電極362。The positive electrode 36 is located on the first dielectric layer 35 and passes through the first dielectric layer 35 to contact the emitter layer 34. The positive electrode 36 includes at least one bus electrode 361, and a plurality of finger electrodes 362 connected to the bus electrode 361.
該背電極37位於該背面33上，並包括兩個分別沿一第一方向81長向延伸且沿一第二方向82間隔排列的電極組370，該第一方向81與該第二方向82彼此之間可為垂直或非垂直。當然在實施上，該背電極37可以僅包括一電極組370。The back electrode 37 is located on the back surface 33 and includes two electrode groups 370 extending longitudinally along a first direction 81 and spaced apart along a second direction 82. The first direction 81 and the second direction 82 are opposite to each other. It can be vertical or non-vertical. Of course, in practice, the back electrode 37 may include only one electrode group 370.
每一電極組370皆包括數個分別沿該第一方向81與該第二方向82而以二維陣列方式排列的第一導電部371，該數個第一導電部371中的至少兩個彼此連接，並且該數個第一導電部371彼此之間分別可包圍出數個周圍為封閉或/及無封閉的鏤空部374，該數個鏤空部374中之至少一個呈多邊形，且本發明中的每一個鏤空部374具有一內周圍壁379，可供於高溫熔融時增加可焊接之面積，從而提昇拉力。本發明的鏤空部374自該數個第一導電部371的頂面朝該基板31的背面33呈內凹狀地延伸，並且該數個鏤空部374的底部露出該第二介電層38相反於該背面33的一側面。另外，本發明所述之二維陣列於該第一方向81與該第二方向82上的行列數量關係為m*n，其中m代表在該第一方向81上的數量，而n代表在該第二方向82上 的數量，且m與n為大於1的整數。Each of the electrode sets 370 includes a plurality of first conductive portions 371 arranged in a two-dimensional array along the first direction 81 and the second direction 82, and at least two of the plurality of first conductive portions 371 are mutually Connecting, and the plurality of first conductive portions 371 can respectively surround a plurality of hollow portions 374 that are closed or/and non-closed, and at least one of the plurality of hollow portions 374 is polygonal, and in the present invention Each of the hollow portions 374 has an inner peripheral wall 379 which is used to increase the weldable area at the time of high temperature melting, thereby increasing the tensile force. The hollow portion 374 of the present invention extends concavely from the top surface of the plurality of first conductive portions 371 toward the back surface 33 of the substrate 31, and the bottom of the plurality of hollow portions 374 exposes the second dielectric layer 38 oppositely. On one side of the back surface 33. In addition, the relationship between the number of rows and columns in the first direction 81 and the second direction 82 of the two-dimensional array of the present invention is m*n, where m represents the number in the first direction 81, and n represents In the second direction 82 The number, and m and n are integers greater than one.
在本實施例中，該數個第一導電部371為三角形，並且該數個第一導電部371之間是以角對角的方式連接，進而包圍出呈三角形且周圍封閉的該數個鏤空部374。其中，每一個鏤空部374的內周圍壁379在與該數個焊帶導線5(見圖3)焊接時可有效提供較多的焊接面積，提昇焊接拉力。當然在實施上，該數個第一導電部371也可為文字形狀、多邊形或/及星形，而不限於本實施例之舉例。In this embodiment, the plurality of first conductive portions 371 are triangular, and the plurality of first conductive portions 371 are connected in an angular diagonal manner, thereby surrounding the plurality of hollows that are triangular and closed around. Department 374. Wherein, the inner peripheral wall 379 of each hollow portion 374 can effectively provide more welding area and improve the welding tension when welding with the plurality of welding strip wires 5 (see FIG. 3). Of course, in practice, the plurality of first conductive portions 371 may also be a character shape, a polygon, or/and a star shape, and are not limited to the examples of the embodiment.
該第二介電層38位於該背面33和該背電極37之間，其材料可以為氧化物、氮化物或上述材料的組合，並可用於修補、降低表面或該基板31內部缺陷，進而降低載子的表面複合速率，提升光電轉換效率。該第二介電層38具有數個位於該基板31與該數個第一導電部371之間的第一開孔381，以及數個位於該基板31背面上方且未受該數個第一導電部371覆蓋的第二開孔382。該數個第一開孔381與該數個第二開孔382中的至少一個為線狀開孔或點狀開孔的形式，當然，該數個第一開孔381與該數個第二開孔382亦可為多邊形或其他形狀。The second dielectric layer 38 is located between the back surface 33 and the back electrode 37, and the material thereof may be an oxide, a nitride or a combination of the above materials, and may be used for repairing, reducing the surface or internal defects of the substrate 31, thereby reducing The surface recombination rate of the carrier increases the photoelectric conversion efficiency. The second dielectric layer 38 has a plurality of first openings 381 between the substrate 31 and the plurality of first conductive portions 371, and a plurality of first conductive layers 381 located above the back surface of the substrate 31 and not subjected to the plurality of first conductive layers. The second opening 382 is covered by the portion 371. At least one of the plurality of first openings 381 and the plurality of second openings 382 is in the form of a linear opening or a dot opening. Of course, the plurality of first openings 381 and the plurality of second holes The aperture 382 can also be polygonal or otherwise shaped.
該背電極37除了具有該數個第一導電部371外，還具有數個第二導電部375和至少一個第三導電部376。在本實施例中，該數個第二導電部375和該第三導電部376的材質彼此相同，但不同於該數個第一導電部371的材質；然而於實施上，該數個第一導電部371、該 數個第二導電部375和該第三導電部376之材質亦可相同。該數個第二導電部375分別位於該數個第一開孔381，並且該數個第二導電部375分別連接該數個第一導電部371與該基板31背面33。且對應於該背面33上，該第三導電部376覆蓋之面積大於該數個第一導電部371所覆蓋之面積。該第三導電部376連接該數個第一導電部371，且該第三導電部376延伸穿過該數個第二開孔382而可電連接該基板31。The back electrode 37 has a plurality of second conductive portions 375 and at least one third conductive portion 376 in addition to the plurality of first conductive portions 371. In this embodiment, the materials of the plurality of second conductive portions 375 and the third conductive portion 376 are the same as each other, but different from the materials of the plurality of first conductive portions 371; however, in practice, the first plurality Conductive portion 371, the The materials of the plurality of second conductive portions 375 and the third conductive portions 376 may be the same. The plurality of second conductive portions 375 are respectively located in the plurality of first openings 381 , and the plurality of second conductive portions 375 are respectively connected to the plurality of first conductive portions 371 and the back surface 33 of the substrate 31 . And corresponding to the back surface 33, the area covered by the third conductive portion 376 is larger than the area covered by the plurality of first conductive portions 371. The third conductive portion 376 is connected to the plurality of first conductive portions 371 , and the third conductive portion 376 extends through the plurality of second openings 382 to electrically connect the substrate 31 .
此外，位於該背面33處之內且對應該第三導電部376於該數個第二開孔382內的部位處，設有數個局部背表面電場(Local Back Surface Field，簡稱LBSF)377，該數個局部背表面電場377與該基板31的導電型相同，但該數個局部背表面電場377的摻雜濃度大於該基板31的摻雜濃度，如此可幫助提升載子收集效率及光電轉換效率，並且載子可經由每一局部背表面電場377進入該第三導電部376或/及該數個第二導電部375，並透過該兩個電極組370的該數個第一導電部371向外導出。In addition, a plurality of local back surface fields (LBSF) 377 are disposed at a portion of the back surface 33 and corresponding to the third conductive portion 376 in the plurality of second openings 382. The plurality of partial back surface electric fields 377 are the same as the conductivity type of the substrate 31, but the doping concentration of the plurality of partial back surface electric fields 377 is greater than the doping concentration of the substrate 31, which can improve the carrier collection efficiency and photoelectric conversion efficiency. And the carrier can enter the third conductive portion 376 or/and the plurality of second conductive portions 375 via each partial back surface electric field 377, and pass through the plurality of first conductive portions 371 of the two electrode groups 370 Exported outside.
在本實施例中，該數個第一開孔381與該數個第二開孔382可為點狀開孔的形式，當然在實施上，該數個第一開孔381與該數個第二開孔382也可如圖7所示為線狀開孔的形式，或者同時混合線狀與點狀的形式，當然該數個第一開孔381與該數個第二開孔382亦可為多邊形，在此不需限制。當然，若該數個第一開孔381與該數個第二開孔382為如圖7所示的線狀開孔的形式時，該數個 第一開孔381分別可沿該第二方向82延伸地連通該數個第二開孔382，進而設計成數條沿該第一方向81間隔排列的線狀開孔。In this embodiment, the plurality of first openings 381 and the plurality of second openings 382 may be in the form of dot-shaped openings. Of course, in practice, the plurality of first openings 381 and the plurality of The two openings 382 can also be in the form of linear openings as shown in FIG. 7 or in the form of a line and a dot. The plurality of first openings 381 and the plurality of second openings 382 can also be used. For polygons, there is no limit here. Of course, if the plurality of first openings 381 and the plurality of second openings 382 are in the form of linear openings as shown in FIG. 7, the plurality The first openings 381 extend in the second direction 82 to communicate with the plurality of second openings 382, and are further configured as a plurality of linear openings spaced along the first direction 81.
請再參閱圖4、5、6，進一步說明的是，本實施例製作該背電極37時，可先於該第二介電層38上塗布一層主要材料為鋁的導電漿料，其中部分的含鋁導電漿料會流動填入該數個第一開孔381與該數個第二開孔382中而接觸該基板31，接著再於該第二介電層38上塗布一層主要材料為銀的導電漿料，其中係使用網印之技術使銀下方僅留有些許上述的含鋁導電漿料。最後透過高溫燒結(Firing)製程使前述兩種導電漿料固化，使含鋁導電漿料分別形成該數個第二導電部375與該第三導電部376，而含銀導電漿料形成該數個第一導電部371，並如圖6所示，該數個第二導電部375分別位於該數個第一開孔381中，各該第二導電部375的相對兩側面分別連接各該第一導電部371與該基板31的背面33。該第三導電部376覆蓋於該第二介電層38上並分別延伸入該數個第二開孔382內而接觸該基板31的背面33。Referring to FIG. 4, FIG. 5 and FIG. 6 further, in the embodiment, when the back electrode 37 is formed, a conductive paste of a main material of aluminum may be coated on the second dielectric layer 38, some of which are partially The aluminum-containing conductive paste flows into the plurality of first openings 381 and the plurality of second openings 382 to contact the substrate 31, and then applies a layer of the main material to the second dielectric layer 38. The conductive paste, in which the technique of screen printing is used, leaves only a little of the above-mentioned aluminum-containing conductive paste under the silver. Finally, the two conductive pastes are cured by a high-temperature sintering (Firing) process, and the aluminum-containing conductive paste is respectively formed into the plurality of second conductive portions 375 and the third conductive portion 376, and the silver-containing conductive paste forms the number. As shown in FIG. 6, the plurality of second conductive portions 375 are respectively located in the plurality of first openings 381, and the opposite sides of the second conductive portions 375 are respectively connected to the first conductive portion 371. A conductive portion 371 and a back surface 33 of the substrate 31. The third conductive portion 376 covers the second dielectric layer 38 and extends into the plurality of second openings 382 to contact the back surface 33 of the substrate 31.
其中，部分的含鋁導電漿料會流動填入該數個第一開孔381與該數個第二開孔382中，並且前述含鋁導電漿料與該基板31的背面33接觸之處，導電漿料的鋁會擴散至該背面33處之內，進而與該基板31的矽混合而形成材料為鋁矽混合物的該數個局部背表面電場377，並且該數個局部背表面電場377的位置對應該數個第二導電部375 的位置以及該第三導電部376位於該數個第二開孔382處的位置。Wherein, part of the aluminum-containing conductive paste flows into the plurality of first openings 381 and the plurality of second openings 382, and the aluminum-containing conductive paste contacts the back surface 33 of the substrate 31, The aluminum of the conductive paste diffuses into the back surface 33 and is further mixed with the crucible of the substrate 31 to form the plurality of partial back surface electric fields 377 of the aluminum crucible mixture, and the plurality of partial back surface electric fields 377 The position corresponds to a plurality of second conductive portions 375 The position of the third conductive portion 376 is located at the plurality of second openings 382.
參閱圖8，當然在實施上，也可先在該第二介電層38上局部塗布一層主材料為銀的導電漿料，其中部分的含銀導電漿料會先流動填入該數個第一開孔381中而接觸該基板31。接著再於該第二介電層38上塗布一層主材料為鋁的導電漿料，且部分的含鋁導電漿料會流動填入該數個第二開孔382中而接觸該基板31。最後透過高溫燒結製程使前述兩種導電漿料固化。其中經燒結後可使含鋁導電漿料形成該第三導電部376，且該第三導電部376的一部分則分別位於該數個第二開孔382之內而接觸該基板31。而含銀導電漿料形成該數個第一導電部371，其中，位於該背面33與該數個第一導電部371之間的該數個第一開孔381內便形成有該數個第二導電部375，此時該數個第一導電部371與該數個第二導電部375的材質彼此相同。Referring to FIG. 8, of course, in the implementation, a conductive paste having a main material of silver may be partially coated on the second dielectric layer 38, and some of the silver-containing conductive paste may first flow into the plurality of layers. The substrate 31 is contacted in an opening 381. Then, a conductive paste having a main material of aluminum is coated on the second dielectric layer 38, and part of the aluminum-containing conductive paste flows into the plurality of second openings 382 to contact the substrate 31. Finally, the two kinds of conductive pastes are cured by a high temperature sintering process. After the sintering, the aluminum-containing conductive paste can be formed into the third conductive portion 376, and a portion of the third conductive portion 376 is respectively located within the plurality of second openings 382 to contact the substrate 31. The silver-containing conductive paste forms the plurality of first conductive portions 371. The plurality of first openings 381 between the back surface 33 and the plurality of first conductive portions 371 are formed in the plurality of first openings 381. The two conductive portions 375 are made of the same material of the plurality of first conductive portions 371 and the plurality of second conductive portions 375.
另言之，於所謂之PERC太陽能電池，即該太陽能電池3的背面33設置有該第二介電層38之型態上，因為該背電極37與該基板31的背面33之間被該第二介電層38所隔開，亦即該背電極37是局部與基板31背面33接觸而其他部份則是位於該第二介電層38上方，使得其結合拉力不若傳統背電極沒有被隔離而完全與基板接觸的好。因此，若在前述PERC太陽能電池上，採用本發明之具有第一導電部371與鏤空部374之設計來增加整體的可焊接面積時，將可較傳統一整條連續且實心形式之背電極具有拉力上 之優勢，乃因本發明能確保可焊接面積之增加，提昇該數個焊帶導線5(見圖3)焊接後之拉力；而反觀傳統一整條背電極因其可與焊帶導線焊接之面積相較於本發明明顯較少，使得傳統一整條連續且實心形式之背電極其若設置於此種PERC太陽能電池上時，將存在結合拉力明顯不足之問題。In other words, in the so-called PERC solar cell, that is, the back surface 33 of the solar cell 3 is provided with the second dielectric layer 38, because the back electrode 37 and the back surface 33 of the substrate 31 are The two dielectric layers 38 are separated, that is, the back electrode 37 is partially in contact with the back surface 33 of the substrate 31 and the other portion is located above the second dielectric layer 38, so that the combined tensile force is not as long as the conventional back electrode is not It is good to isolate and completely contact the substrate. Therefore, if the design of the first conductive portion 371 and the hollow portion 374 of the present invention is used to increase the overall solderable area on the aforementioned PERC solar cell, the back electrode having a continuous and solid form can be provided in a conventional manner. Pull on The advantage is that the invention can ensure the increase of the weldable area and increase the tensile force of the plurality of strip conductors 5 (see FIG. 3) after welding; and the conventional one back electrode can be welded with the strip conductors. The area is significantly less than in the present invention, so that if a conventional continuous and solid form of the back electrode is placed on such a PERC solar cell, there will be a problem that the combined tensile force is significantly insufficient.
進一步說明的是，在實施上，該背電極37的電極組370與該基板31的背面33之間的該第二介電層38處也可不形成該數個第一開孔381，即該電極組370的第一導電部371直接配置在該第二介電層38上而不接觸該基板31的背面33，透過該第二介電層38將該電極組370與該基板31間隔開來，如此可增加該背電極37下方的第二介電層38對該基板31的背面33的鈍化面積，有助於電性提昇。由此可知，該背電極37是否具有該數個第一開孔381之設計，可依其所欲著重強調之特點與其所具有之效果來個別設計製作。Further, in practice, the plurality of first openings 381 may not be formed at the second dielectric layer 38 between the electrode group 370 of the back electrode 37 and the back surface 33 of the substrate 31, that is, the electrode The first conductive portion 371 of the group 370 is disposed directly on the second dielectric layer 38 without contacting the back surface 33 of the substrate 31, and the electrode group 370 is spaced apart from the substrate 31 through the second dielectric layer 38. Thus, the passivation area of the second dielectric layer 38 under the back electrode 37 to the back surface 33 of the substrate 31 can be increased to contribute to electrical improvement. It can be seen from the above that whether the back electrode 37 has the design of the plurality of first openings 381 can be individually designed and manufactured according to the characteristics to be emphasized and the effects thereof.
參閱圖3、4、5，由以上的說明可知，相較於一般太陽能電池的背電極印製成一整條連續線狀體的作法，本發明將該背電極37的電極組370分隔成以二維陣列式排列的該數個第一導電部371，前述創新的結構設計，使本發明的背電極37的電極組370整體非完全實心，並且在該數個第一導電部371之間包圍出該數個鏤空部374，進而可節省該背電極37的導電漿料的耗費，以降低生產成本。Referring to Figures 3, 4 and 5, it can be seen from the above description that the electrode group 370 of the back electrode 37 is divided into two in comparison with the method in which the back electrode of a general solar cell is printed as a single continuous linear body. The plurality of first conductive portions 371 are arranged in an array, and the foregoing innovative structural design is such that the electrode group 370 of the back electrode 37 of the present invention is not completely solid as a whole, and is surrounded between the plurality of first conductive portions 371. The plurality of hollow portions 374 can further save the cost of the conductive paste of the back electrode 37 to reduce the production cost.
減少導電漿料的使用量除了可以降低成本之外，由於前述導電漿料塗布於該基板31的背面33上而進行燒結作業時，若選用的導電漿料會對該第二介電層38產生燒穿之情形時，如此將會減少該第二介電層38對該背面33鈍化的面積，進而影響該太陽能電池3的光電轉換效率。因此，本實施例減少導電漿料覆蓋於該第二介電層38上的面積，可減少導電漿料燒穿該第二介電層38之情形，使設置於該基板31之背面33上的該第二介電層38能保有較大面積，以提供良好鈍化效果，進而可提高光電轉換效率。In addition to reducing the cost of the conductive paste, when the conductive paste is applied to the back surface 33 of the substrate 31 for sintering, the selected conductive paste may be generated for the second dielectric layer 38. In the case of burn-through, this will reduce the area of the second dielectric layer 38 that is passivated to the back surface 33, thereby affecting the photoelectric conversion efficiency of the solar cell 3. Therefore, in this embodiment, the area of the conductive paste covering the second dielectric layer 38 is reduced, and the conductive paste is burned through the second dielectric layer 38 to be disposed on the back surface 33 of the substrate 31. The second dielectric layer 38 can maintain a large area to provide a good passivation effect, thereby improving the photoelectric conversion efficiency.
除此之外，由於網印製程與漿料流動特性所致，一般在網印形成一整條連續線狀的電極時，在結構上會有中央厚度相對於左右兩側的厚度較薄的問題，導致焊接時焊帶導線只會與電極的兩側凸起部位接觸，故使得焊帶導線與電極兩者之間的接觸面積不足而降低焊接結合力。反觀，本實施例將該背電極37的電極組370分隔成以二維陣列式排列的該數個第一導電部371的設計，使每一第一導電部371中央厚度與外側厚度的差異變小而較為均勻，同時所有的第一導電部371彼此之間的厚度也較為一致，藉此增加在後續焊接時所述焊帶導線5與所述電極組370的第一導電部371的焊接面積以提供更強的焊接支撐拉力，故可克服因一般整條連續線狀的電極其中央下凹結構導致所述焊帶導線5架空而接觸不良、容易剝落的問題。In addition, due to the screen printing process and the flow characteristics of the slurry, generally when the screen is formed into a continuous line of electrodes, there is a problem that the thickness of the center is thin relative to the left and right sides. As a result, the solder ribbon is only in contact with the convex portions on both sides of the electrode during soldering, so that the contact area between the solder ribbon and the electrode is insufficient to reduce the solder bonding force. In contrast, in this embodiment, the electrode group 370 of the back electrode 37 is partitioned into a design of the plurality of first conductive portions 371 arranged in a two-dimensional array, such that the difference between the central thickness and the outer thickness of each of the first conductive portions 371 is changed. Small and relatively uniform, while the thicknesses of all the first conductive portions 371 are relatively uniform with each other, thereby increasing the soldering area of the strip conductor 5 and the first conductive portion 371 of the electrode group 370 during subsequent soldering. In order to provide a stronger welding support pulling force, it is possible to overcome the problem that the strip conductor 5 is overhead due to the general concave structure of the entire continuous linear electrode, and the contact is poor and easy to peel off.
當然在實施上，該正電極36的匯流電極361也可與該背電極37具有相同的結構，並具有數個以二維陣列 式排列的導電部，該數個導電部的形狀也可為文字形狀、多邊形或/及星形，但不限於前述舉例。如此一來，還可再一次地節省導電漿料的消耗，而更進一步地降低該太陽能電池3的製造成本。同時，該數個焊帶導線5仍能與該正電極36的匯流電極361維持良好的結合性及焊接穩固性，所以在封裝模組時該數個焊帶導線5不易脫落。Of course, in practice, the bus electrode 361 of the positive electrode 36 can also have the same structure as the back electrode 37, and have several two-dimensional arrays. The conductive portions arranged in the form, the shape of the plurality of conductive portions may also be a letter shape, a polygon or/and a star shape, but are not limited to the foregoing examples. In this way, the consumption of the conductive paste can be saved again, and the manufacturing cost of the solar cell 3 can be further reduced. At the same time, the plurality of soldering strip wires 5 can still maintain good bonding and soldering stability with the bus electrode 361 of the positive electrode 36. Therefore, the plurality of soldering strip wires 5 are not easily peeled off when the module is packaged.
綜上所述，將該背電極37分隔成以二維陣列式排列的該數個第一導電部371的創新結構設計，在節省導電漿料以降低製造成本的同時，還能增加該數個第一導電部371與該數個焊帶導線5的接觸面積，因而有助於提升兩者之間的焊接結合力與支撐力，並在封裝模組時所述焊帶導線5能穩固地結合而不易脫落，故可提升焊接作業與後續模組封裝製程時的製造良率與使用可靠性。In summary, the back electrode 37 is partitioned into an innovative structural design of the plurality of first conductive portions 371 arranged in a two-dimensional array, and the conductive paste can be saved to reduce the manufacturing cost, and the number can be increased. The contact area of the first conductive portion 371 with the plurality of solder ribbon wires 5, thereby helping to improve the solder bonding force and the supporting force between the two, and the solder ribbon wire 5 can be firmly combined when the module is packaged It is not easy to fall off, so it can improve the manufacturing yield and reliability of the soldering operation and subsequent module packaging process.
參閱圖9，本發明太陽能電池之一第二較佳實施例與該第一較佳實施例大致相同，兩者之間的差別在於：該數個第一導電部371為四角星形。Referring to FIG. 9, a second preferred embodiment of the solar cell of the present invention is substantially the same as the first preferred embodiment. The difference between the two is that the plurality of first conductive portions 371 are square stars.
參閱圖10，本發明太陽能電池之一第三較佳實施例與該第一較佳實施例大致相同，兩者之間的差別在於：該數個第一導電部371為五角星形。Referring to FIG. 10, a third preferred embodiment of the solar cell of the present invention is substantially the same as the first preferred embodiment, and the difference between the two is that the plurality of first conductive portions 371 are pentagonal.
參閱圖11，本發明太陽能電池之一第四較佳實施例與該第一較佳實施例大致相同，兩者之間的差別在於：該數個第一導電部371為六角星形。Referring to FIG. 11, a fourth preferred embodiment of the solar cell of the present invention is substantially the same as the first preferred embodiment, and the difference between the two is that the plurality of first conductive portions 371 are hexagonal stars.
參閱圖12，本發明太陽能電池之一第五較佳實施例與該第一較佳實施例大致相同，兩者之間的差別在 於：該數個第一導電部371為六角形，並且該數個第一導電部371之間是以邊對邊的方式連接，進而包圍出呈六角形的該數個的鏤空部374。當然在實施上，該數個第一導電部371也可以角對角的方式連接。Referring to FIG. 12, a fifth preferred embodiment of the solar cell of the present invention is substantially the same as the first preferred embodiment, and the difference between the two is The plurality of first conductive portions 371 are hexagonal, and the plurality of first conductive portions 371 are connected side to side to surround the plurality of hollow portions 374 having a hexagonal shape. Of course, in practice, the plurality of first conductive portions 371 may also be connected diagonally.
參閱圖13，本發明太陽能電池之一第六較佳實施例與該第一較佳實施例大致相同，兩者之間的差別在於：該數個第一導電部371為英文字母的形狀，具體而言，該數個第一導電部371為M形，但不限於此。Referring to FIG. 13, a sixth preferred embodiment of the solar cell of the present invention is substantially the same as the first preferred embodiment. The difference between the two is that the plurality of first conductive portions 371 are in the shape of an English letter. The plurality of first conductive portions 371 are M-shaped, but are not limited thereto.
參閱圖14，本發明太陽能電池之一第七較佳實施例與該第一較佳實施例大致相同，兩者之間的差別在於：該數個第一導電部371為X形，每一電極組370的第一導電部371皆沿該第一方向81排列，並且其中一個電極組370的第一導電部371與另一個電極組370的第一導電部371之間是沿該第二方向82間隔設置，進而使該數個第一導電部371以二維陣列方式排列。Referring to FIG. 14, a seventh preferred embodiment of the solar cell of the present invention is substantially the same as the first preferred embodiment. The difference between the two is that the plurality of first conductive portions 371 are X-shaped and each electrode The first conductive portions 371 of the group 370 are all arranged along the first direction 81, and the first conductive portion 371 of one of the electrode groups 370 and the first conductive portion 371 of the other electrode group 370 are along the second direction 82. The plurality of first conductive portions 371 are arranged in a two-dimensional array.
而本實施例的太陽能電池3還包含兩個分別沿該第一方向81長向延伸的連接電極39，每一連接電極39貫穿地與每一電極組370的該數個第一導電部371接觸，以下為了方便說明，於圖中以假想線區分該個連接電極39與該數個第一導電部371。The solar cell 3 of the present embodiment further includes two connection electrodes 39 extending in the first direction 81, and each of the connection electrodes 39 is in contact with the plurality of first conductive portions 371 of each electrode group 370. Hereinafter, for convenience of explanation, the connection electrodes 39 and the plurality of first conductive portions 371 are distinguished by imaginary lines in the drawing.
該兩個連接電極39的材料與該數個第一導電部371相同，皆由含銀的導電漿料製成。本實施例的該數個第一導電部371分別透過該兩個連接電極39而連接彼此，並且分別以該兩個連接電極39為對稱軸設置。當然在實施 上，該太陽能電池3可以僅在其中一個電極組370上設置一連接電極39。The material of the two connection electrodes 39 is the same as that of the plurality of first conductive portions 371, and is made of a conductive paste containing silver. The plurality of first conductive portions 371 of the present embodiment are respectively connected to each other through the two connection electrodes 39, and are respectively disposed with the two connection electrodes 39 as symmetry axes. Of course in implementation In the above, the solar cell 3 may be provided with a connection electrode 39 only on one of the electrode groups 370.
本實施例透過增設該兩個連接電極39，可增加該數個焊帶導線(圖未示)在焊接時的接觸面積，以提升兩者之間的焊接結合力與支撐力，藉此進一步地提升焊接作業時的製造良率與使用可靠性。In this embodiment, by adding the two connecting electrodes 39, the contact area of the plurality of soldering strip wires (not shown) during soldering can be increased to improve the solder bonding force and the supporting force between the two, thereby further Improve manufacturing yield and reliability during welding operations.
參閱圖15，本發明太陽能電池之一第八較佳實施例與該第七較佳實施例大致相同，兩者之間的差別在於：每一連接電極39位於每一電極組370的該數個第一導電部371之間，而該數個第一導電部371為D形，並且兩兩交錯排列地連接於其中一個連接電極39的相反側，具體而言，每一第一導電部371具有一向外弧凸的凸出段372，以及一連接於該凸出段372與其中一個連接電極39之間的連接段373。Referring to FIG. 15, an eighth preferred embodiment of the solar cell of the present invention is substantially the same as the seventh preferred embodiment, and the difference between the two is that each of the connection electrodes 39 is located in the plurality of electrode groups 370. Between the first conductive portions 371, the plurality of first conductive portions 371 are D-shaped, and the two pairs are staggeredly connected to opposite sides of one of the connection electrodes 39. Specifically, each of the first conductive portions 371 has An outwardly convex projection 372, and a connecting portion 373 connected between the projection 372 and one of the connection electrodes 39.
參閱圖16，本發明太陽能電池之一第九較佳實施例與該第八較佳實施例大致相同，兩者之間的差別在於：該數個第一導電部371為三角形，並且每一電極組370的該數個第一導電部371是兩兩一組地連接於其中一個連接電極39的相反側，而位於每一連接電極39相反側的該兩個第一導電部371彼此不對稱。Referring to FIG. 16, a ninth preferred embodiment of the solar cell of the present invention is substantially the same as the eighth preferred embodiment. The difference between the two is that the plurality of first conductive portions 371 are triangular and each electrode The plurality of first conductive portions 371 of the group 370 are connected to the opposite sides of one of the connection electrodes 39 in a pair, and the two first conductive portions 371 on the opposite side of each of the connection electrodes 39 are asymmetrical to each other.
參閱圖17，本發明太陽能電池之一第十較佳實施例與該第八較佳實施例大致相同，兩者之間的差別在於：每一電極組370的該數個第一導電部371是兩兩一組地連接於其中一個連接電極39的相反側，而位於每一連接 電極39相反側的該兩個第一導電部371彼此對稱。此外，該數個第一導電部371中的至少一個具有一周圍封閉的鏤空部374。Referring to FIG. 17, a tenth preferred embodiment of the solar cell of the present invention is substantially the same as the eighth preferred embodiment. The difference between the two is that the plurality of first conductive portions 371 of each electrode group 370 are Connected to the opposite side of one of the connection electrodes 39 in pairs, and at each connection The two first conductive portions 371 on the opposite side of the electrode 39 are symmetrical to each other. Further, at least one of the plurality of first conductive portions 371 has a hollow portion 374 that is closed around.
進一步說明的是，本實施例的每一第一導電部371皆具有一周圍封閉的鏤空部374，前述設計可以使每一第一導電部371的厚度變得均勻，藉此增加在後續焊接時焊帶導線(圖未示)與該數個第一導電部371的焊接面積，因而進一步地提供更強的焊接支撐拉力，並增進焊接作業時的製造良率與使用可靠性。It is further noted that each of the first conductive portions 371 of the embodiment has a peripherally closed hollow portion 374, and the foregoing design can make the thickness of each of the first conductive portions 371 uniform, thereby increasing the subsequent soldering. The welding strip wire (not shown) and the welding area of the plurality of first conductive portions 371 further provide a stronger welding support tensile force and improve manufacturing yield and use reliability during the welding operation.
參閱圖18，本發明太陽能電池之一第十一較佳實施例與該第十較佳實施例大致相同，兩者之間的差別在於：每一第一導電部371具有一圓滑地向外弧凸的凸出段372、一連接於該凸出段372與其中一個連接電極39之間的連接段373，以及兩個被該凸出段372、該連接段373與該連接電極39環繞而呈周圍封閉的鏤空部374。Referring to Fig. 18, an eleventh preferred embodiment of the solar cell of the present invention is substantially the same as the tenth preferred embodiment, and the difference between the two is that each of the first conductive portions 371 has a smooth outward arc. a convex protruding section 372, a connecting section 373 connected between the protruding section 372 and one of the connecting electrodes 39, and two surrounded by the protruding section 372, the connecting section 373 and the connecting electrode 39 A closed hollow portion 374.
參閱圖19，本發明太陽能電池之一第十二較佳實施例與該第十較佳實施例大致相同，兩者之間的差別在於：每一第一導電部371的凸出段372呈角度彎折狀。Referring to FIG. 19, a twelfth preferred embodiment of the solar cell of the present invention is substantially the same as the tenth preferred embodiment. The difference between the two is that the convex portion 372 of each first conductive portion 371 is at an angle. Bent.
本發明上述第七較佳實施例至第十二較佳實施例中所設置的連接電極，可提供本發明之實施例在為減少導電漿料之用量以及增加焊接面積之目的下，進一步提供此與焊帶導線呈對應延伸平行形貌的連接電極，透過如此之設計，可再進一步加強且提昇整體的焊接效果，確保整體之拉力。The connecting electrode provided in the seventh preferred embodiment to the twelfth preferred embodiment of the present invention can provide an embodiment of the present invention, further providing the purpose of reducing the amount of the conductive paste and increasing the soldering area. The connecting electrode corresponding to the parallel strip shape of the strip conductor can be further strengthened and the overall welding effect can be further enhanced to ensure the overall pulling force.
惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及專利說明書內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.
3‧‧‧太陽能電池3‧‧‧Solar battery
31‧‧‧基板31‧‧‧Substrate
32‧‧‧正面32‧‧‧ positive
33‧‧‧背面33‧‧‧Back
34‧‧‧射極層34‧‧ ‧ emitter layer
35‧‧‧第一介電層35‧‧‧First dielectric layer
36‧‧‧正電極36‧‧‧ positive electrode
361‧‧‧匯流電極361‧‧‧Concurrent electrode
362‧‧‧指狀電極362‧‧‧ finger electrode
37‧‧‧背電極37‧‧‧Back electrode
370‧‧‧電極組370‧‧‧electrode group
371‧‧‧第一導電部371‧‧‧First Conductive Department
374‧‧‧鏤空部374‧‧‧镂空部
375‧‧‧第二導電部375‧‧‧Second Conductive Department
376‧‧‧第三導電部376‧‧‧ Third Conductive Department
377‧‧‧局部背表面電場377‧‧‧Partial back surface electric field
379‧‧‧內周圍壁379‧‧‧ inner wall
38‧‧‧第二介電層38‧‧‧Second dielectric layer
381‧‧‧第一開孔381‧‧‧ first opening
382‧‧‧第二開孔382‧‧‧Second opening
81‧‧‧第一方向81‧‧‧First direction
82‧‧‧第二方向82‧‧‧second direction
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| TWI631814B (en) * | 2017-08-11 | 2018-08-01 | 財團法人工業技術研究院 | Photovoltaic module |
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| US7393699B2 (en) * | 2006-06-12 | 2008-07-01 | Tran Bao Q | NANO-electronics |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201448238A (en) | 2014-12-16 |
| CN104241404A (en) | 2014-12-24 |
| CN104241404B (en) | 2016-12-28 |
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