TWI547957B - Applicable to low printed weight of conductive aluminum for solar cells and the application of the conductive aluminum adhesive solar cells - Google Patents
Applicable to low printed weight of conductive aluminum for solar cells and the application of the conductive aluminum adhesive solar cells Download PDFInfo
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本發明係關於一種導電鋁膠，特別關於一種含釩、磷或鉬源的導電鋁膠。本發明亦關於一種應用該導電鋁膠之太陽能電池。 This invention relates to a conductive aluminum paste, and more particularly to a conductive aluminum paste containing a source of vanadium, phosphorus or molybdenum. The invention also relates to a solar cell using the conductive aluminum paste.
太陽能電池是一種將太陽光轉換成直流電能輸出的一種裝置，其中矽基太陽能電池為太陽能發電之主流(占產業比重80%以上)，業界現有產品多為採用P型矽基材為基底，在受光面以高溫磷擴散(phosphorous diffusion)形成n+射極，形成一P-N接面二極體；接著在n+表面形成一層60~80nm之抗反射層；隨後在抗反射層上網版印刷30~90μm的細長柵狀銀電極與正面匯流電極(busbar)；另一面(p面)也印上背面匯流電極，接著印上鋁膠做為鋁源，其目的是在高溫環境下與矽基形成鋁矽合金與背面場(back surface field,BSF)層，可以避免少數載子在背面複合(recombination)的機會。 Solar cells are a kind of device that converts sunlight into DC power output. Among them, silicon-based solar cells are the mainstream of solar power generation (accounting for more than 80% of the industry). Most of the existing products in the industry use P-type germanium substrates as the base. The light-receiving surface forms a n + emitter by a high-temperature phosphorus diffusion to form a PN junction diode; then a 60-80 nm anti-reflection layer is formed on the n + surface; and then the anti-reflection layer is printed on the screen 30~ 90μm elongated grid-shaped silver electrode and front busbar (busbar); the other side (p-face) is also printed with a backside bus electrode, followed by aluminum glue as an aluminum source, the purpose of which is to form aluminum with bismuth base in high temperature environment The tantalum alloy and the back surface field (BSF) layer avoid the chance of a few carriers recombining on the back side.
為了達到最高的效率與拉力表現，業界熟知可在6吋矽基材上，藉由網版印刷印上鋁膠做為鋁源，一般而言，一6吋矽基材中該鋁膠所需要的印重為1.3g~1.7g；若印重低於1.3g會出現以下負面影響：1. 拉力不足(源於沒有足夠的熔鋁與矽形成夠厚的鋁矽合金)；2. 效率不足(BSF層的厚度不夠，少數載子在背面複合的機率仍高)。 In order to achieve the highest efficiency and tensile performance, it is well known in the industry that aluminum foil can be printed on the 6-inch substrate by screen printing as an aluminum source. Generally, the aluminum adhesive is required in a 6-inch substrate. The printing weight is 1.3g~1.7g; if the printing weight is less than 1.3g, the following negative effects will occur: 1. insufficient pulling force (due to insufficient aluminum and tantalum to form a thick aluminum-bismuth alloy); 2. insufficient efficiency (The thickness of the BSF layer is not sufficient, and the probability of a few carriers recombining on the back side is still high).
然而，鋁膠之印重若能低於1.3g，可同時帶來以下正面效應：1. 低製造成本(低鋁膠用量)；2. 優良的耐水性(鋁會跟水反應釋放氫氣，造成封裝壓合後的模組層間脫附，導致模組壽命縮短；若能減少鋁膠的使用量，將可延長模組壽命)；3. 低翹曲(鋁與矽的熱膨脹係數不同，高溫接合成鋁矽合金若過厚，降回常溫會產生翹曲現象，其中鋁的熱膨脹係數為23ppm/K，矽的熱膨脹係數為2.5ppm/K，二者之間有不小的差異)。 However, if the printing weight of aluminum glue is less than 1.3g, it can bring the following positive effects: 1. Low manufacturing cost (low aluminum adhesive dosage); 2. Excellent water resistance (aluminum will react with water to release hydrogen, resulting in Debonding between the module layers after the package is pressed, resulting in shortened module life; if the amount of aluminum glue can be reduced, the life of the module can be extended); 3. Low warpage (the thermal expansion coefficient of aluminum and tantalum is different, high temperature connection If the synthetic aluminum-bismuth alloy is too thick, it will cause warpage when it is returned to normal temperature. The thermal expansion coefficient of aluminum is 23ppm/K, and the thermal expansion coefficient of bismuth is 2.5ppm/K. There is no small difference between the two.
因此，如何開發出一種高活性的太陽能導電鋁膠，可以在印重減輕的情況下，維持良好的電性與拉力，並且帶來低廉的製造成本、強化耐水性、減低翹曲是所有太陽能導電鋁膠開發者的研發重點。 Therefore, how to develop a highly active solar conductive aluminum adhesive, which can maintain good electrical and tensile strength in the case of light weight reduction, and bring low manufacturing cost, strengthen water resistance, and reduce warpage. The focus of research and development of aluminum gel developers.
為解決上述現有技術的缺失，本發明係提供一種適用於低印刷重量之太陽能電池用導電鋁膠及應用該導電鋁膠之太陽能電池。藉此改善習知技術之太陽能導電鋁膠，無法在印重減輕的情況下，維持良好的電性與拉力的問題。 In order to solve the above-mentioned shortcomings of the prior art, the present invention provides a conductive aluminum paste for solar cells suitable for low printing weight and a solar cell using the conductive aluminum paste. In this way, the solar conductive aluminum paste of the prior art can be improved, and the problem of good electrical and tensile strength cannot be maintained with the printing weight reduced.
為達上述目的及其他目的，本發明係提供一種適用於低印刷重量之太陽能電池用導電鋁膠，包含：鋁粉；有機載體；以及至少一釩、磷或鉬源，該釩、磷或鉬源之總含量係不高於該導電鋁膠總重的0.5%。 To achieve the above and other objects, the present invention provides a conductive aluminum paste for solar cells suitable for low printing weight, comprising: aluminum powder; an organic carrier; and at least one vanadium, phosphorus or molybdenum source, the vanadium, phosphorus or molybdenum The total content of the source is not more than 0.5% of the total weight of the conductive aluminum paste.
上述之導電鋁膠，其中該釩、磷或鉬源可為氧化釩、氧化磷或氧化鉬。 The above conductive aluminum paste, wherein the vanadium, phosphorus or molybdenum source may be vanadium oxide, phosphorus oxide or molybdenum oxide.
上述之導電鋁膠，其中該鋁粉可佔該導電鋁膠總重的65~80%，較佳為70~76%。 The conductive aluminum paste described above, wherein the aluminum powder may account for 65-80%, preferably 70-76%, of the total weight of the conductive aluminum paste.
上述之導電鋁膠，其中該鋁粉較佳係包含：小顆鋁粉，其粒徑係小於3μm；以及大顆鋁粉，其粒徑係為3~7μm，其中該小顆鋁粉之含量係不高於該導電鋁膠總重的30%。 The conductive aluminum paste, wherein the aluminum powder preferably comprises: a small aluminum powder having a particle size of less than 3 μm; and a large aluminum powder having a particle size of 3 to 7 μm, wherein the content of the small aluminum powder It is not higher than 30% of the total weight of the conductive aluminum paste.
上述之導電鋁膠，其中該小顆鋁粉之含量較佳係佔該導電鋁膠總重的5~25%。 The conductive aluminum paste mentioned above, wherein the content of the small aluminum powder is preferably 5 to 25% of the total weight of the conductive aluminum adhesive.
上述之導電鋁膠，其中該有機載體較佳係佔該導電鋁膠總重的10~30%。 The above conductive aluminum paste, wherein the organic carrier preferably accounts for 10 to 30% of the total weight of the conductive aluminum paste.
上述之導電鋁膠，其中該有機載體包含：樹脂，其可選自由乙基纖維素、木松香及聚丙烯腈所組成之群組；以及溶劑。 The above conductive aluminum paste, wherein the organic vehicle comprises: a resin selected from the group consisting of ethyl cellulose, wood rosin and polyacrylonitrile; and a solvent.
上述之導電鋁膠，其中可進一步包含：玻璃粉，其平均粒徑係小於6.0μm，且含量係不高於該導電鋁膠總重的10%。 The conductive aluminum paste described above may further comprise: a glass frit having an average particle diameter of less than 6.0 μm and a content not higher than 10% of the total weight of the conductive aluminum paste.
上述之導電鋁膠，其中可進一步包含：添加劑，其係選自由分散劑、流平劑、脫泡劑、抗沉降劑、觸變助劑及偶合劑所組成之群組。 The conductive aluminum paste described above may further comprise: an additive selected from the group consisting of a dispersant, a leveling agent, a defoaming agent, an anti-settling agent, a thixotropic agent, and a coupling agent.
為達上述目的及其他目的，本發明亦提供一種太陽能電池，其係包含上述之導電鋁膠。 To achieve the above and other objects, the present invention also provides a solar cell comprising the above-described conductive aluminum paste.
本發明之一種適用於低印刷重量之太陽能電池用導電鋁膠及應用該導電鋁膠之太陽能電池，可以在印重減輕的情況下，維持良好的電性與拉力，並可降低製造成本、強化耐水性、減低翹曲。 The invention relates to a conductive aluminum glue for solar cells with low printing weight and a solar battery using the same, which can maintain good electric and tensile force under the condition of light weight reduction, and can reduce manufacturing cost and strengthen Water resistance and reduced warpage.
為充分瞭解本發明之目的、特徵及功效，茲藉由下述具體之實施例，對本發明做一詳細說明，說明如後： In order to fully understand the objects, features and effects of the present invention, the present invention will be described in detail by the following specific embodiments.
本發明所提供之導電鋁膠大體上包含了鋁粉、有機載體以及釩、磷或鉬源至少其一，亦可進一步包含玻璃粉及各類添加劑。 The conductive aluminum paste provided by the invention generally comprises aluminum powder, an organic carrier and at least one of vanadium, phosphorus or molybdenum sources, and may further comprise glass powder and various additives.
鋁粉可佔該導電鋁膠總重的65~80%，較佳為70~76%。 The aluminum powder may account for 65 to 80%, preferably 70 to 76%, of the total weight of the conductive aluminum rubber.
鋁粉較佳可由兩種以上顆粒大小組成，可粗分為小顆鋁粉與大顆鋁粉兩類，若小顆鋁粉粒徑<3μm，大顆鋁粉粒徑為3~7μm，小顆鋁粉佔該導電鋁膠總重不高過30wt%，以5~25wt%為佳。 The aluminum powder is preferably composed of two or more kinds of particles, and can be roughly classified into two types: small aluminum powder and large aluminum powder. If the small aluminum powder has a particle size of <3 μm, the large aluminum powder has a particle size of 3 to 7 μm. The aluminum powder accounts for no more than 30% by weight of the total weight of the conductive aluminum rubber, preferably 5 to 25 wt%.
釩、磷或鉬源(即含上述元素之添加物，例如：氧化釩、氧化磷、氧化鉬)用以提升鋁膠反應活性；可以來自於無機化合物、玻璃粉、有機物化合物、添加劑等但並不以此為限；該釩、磷或鉬源之總含量係不高於該導電鋁膠總重的0.5%。 Vanadium, phosphorus or molybdenum sources (ie additives containing the above elements, such as: vanadium oxide, phosphorus oxide, molybdenum oxide) to enhance the reactivity of aluminum gel; can be derived from inorganic compounds, glass powder, organic compounds, additives, etc. Not limited to this; the total content of the vanadium, phosphorus or molybdenum source is not higher than 0.5% of the total weight of the conductive aluminum paste.
有機載體用以提供網印性與乾燥強度。由至少一種之樹脂與至少一種之有機溶劑調配而成，樹脂可為乙基纖維素、木松香或聚丙烯腈，但並不以此為限；溶劑可為酯醇成膜劑(TEXANOL®,EASTMAN CHEMICAL COMPANY)、松油醇或二乙二醇丁醚等，但並不以此為限；有機載體佔該導電鋁膠總重的10~30wt%，以20~28wt%為佳。 Organic carriers are used to provide screen printing and drying strength. It is prepared by mixing at least one kind of resin with at least one organic solvent, and the resin may be ethyl cellulose, wood rosin or polyacrylonitrile, but not limited thereto; the solvent may be an ester alcohol film forming agent (TEXANOL®, EASTMAN CHEMICAL COMPANY), terpineol or diethylene glycol butyl ether, etc., but not limited thereto; the organic carrier accounts for 10 to 30% by weight of the total weight of the conductive aluminum rubber, preferably 20 to 28% by weight.
玻璃粉用以提高鋁膠對基板之附著性與控制鋁膠反應特性；本發明之導電鋁膠中可包含一種或數種玻璃粉，該玻璃粉可藉由多種元素或化合物 在高溫下熔融而成，其成份可包含：Bi2O3、B2O3、SiO2、Al2O3、TiO2但並不以此為限。該玻璃粉之平均粒徑<6.0μm，含量占總體導電膠的0~10wt%，以不高於3%為最佳。 The glass powder is used for improving the adhesion of the aluminum glue to the substrate and controlling the reaction characteristics of the aluminum glue; the conductive aluminum glue of the present invention may comprise one or several kinds of glass powder, and the glass powder may be melted at a high temperature by various elements or compounds. The composition may include: Bi 2 O 3 , B 2 O 3 , SiO 2 , Al 2 O 3 , TiO 2 but not limited thereto. The average particle diameter of the glass powder is <6.0 μm, and the content is 0 to 10% by weight of the total conductive rubber, and preferably not more than 3%.
添加劑用以強化鋁膠之穩定性、印刷性、平坦性、反應性高低與粉體密著性，可以選擇分散劑、流平劑、脫泡劑、抗沉降劑、觸變助劑、偶合劑等，但並不以此為限，添加劑總合佔該導電鋁膠總重的0~5wt%，以0~1.3wt%為佳。 Additives are used to enhance the stability, printability, flatness, reactivity and powder adhesion of aluminum adhesives. Dispersants, leveling agents, defoamers, anti-settling agents, thixotropic agents, coupling agents can be selected. Etc., but not limited thereto, the additive totals 0 to 5 wt% of the total weight of the conductive aluminum paste, preferably 0 to 1.3 wt%.
本發明實施例1~4及比較例1~2之導電鋁膠係依照下列表一所示之配方及百分比配製：
實施例1Example 1
實施例1之導電鋁膠係藉由下列步驟製備： The conductive aluminum paste of Example 1 was prepared by the following steps:
步驟一(有機載體製作)：將乙基纖維素(ETHOCEL Std 20)/松油醇/二乙二醇丁醚以15：20：65的比例加入反應槽中，110℃油浴下以300rpm的方式攪拌三小時以上，直至完全溶解。 Step 1 (manufacturing of organic carrier): Ethyl cellulose (ETHOCEL Std 20) / terpineol / diethylene glycol butyl ether was added to the reaction tank at a ratio of 15:20:65, and the oil bath at 110 ° C was 300 rpm. Stir for more than three hours until completely dissolved.
步驟二：依照表一所示之配方及百分比，於步驟一所製得之有機載體中添加玻璃粉、鋁粉等其他配方，配製成300g的混合鋁膠。 Step 2: According to the formula and percentage shown in Table 1, other formulas such as glass powder and aluminum powder are added to the organic carrier prepared in the first step to prepare 300 g of mixed aluminum glue.
步驟三： Step three:
以高速攪拌機攪拌步驟二製得之混合鋁膠3分鐘，使其充分混合後，以三輥研磨機(廠牌型號：Exakt 80E)研磨三次，可得黏度為30~50Pa．s，平均粒徑為8μm之導電鋁膠。 The mixed aluminum rubber prepared in the second step was stirred by a high-speed mixer for 3 minutes, and after fully mixing, it was ground three times with a three-roll mill (brand type: Exakt 80E) to obtain a viscosity of 30 to 50 Pa. s, a conductive aluminum paste having an average particle diameter of 8 μm.
實施例2~4及比較例1~2Examples 2 to 4 and Comparative Examples 1 to 2
實施例2~4及比較例1~2之導電鋁膠係藉由與實施例1相同之步驟製備，但於步驟二中，分別依據表一改變配方及百分比。 The conductive aluminum pastes of Examples 2 to 4 and Comparative Examples 1 and 2 were prepared by the same procedures as in Example 1, but in the second step, the formulations and percentages were changed according to Table 1, respectively.
測試例Test case
使用上述實施例1~4及比較例1~2製得之導電鋁膠，依照下列步驟製備太陽能電池： Using the conductive aluminum paste prepared in the above Examples 1 to 4 and Comparative Examples 1 and 2, a solar cell was prepared in accordance with the following procedure:
步驟一(印刷)：以網印方式將背面銀膠與正面銀膠分別印在6吋矽基材的背面與正面，以200℃烘箱乾燥後，在矽基材背面的背面銀膠未覆蓋之處，印上實施例1~4及比較例1~2製得之導電鋁膠，導電鋁膠與背面銀膠間，須有部分重疊。調控印刷參數與網版網篩數以控制不同印重後，重新置入200℃烘箱乾燥，製得待燒結之印刷矽基材。 Step 1 (printing): The backside silver paste and the front side silver paste are separately printed on the back side and the front side of the 6-inch substrate by screen printing, and dried in an oven at 200 ° C, and the silver paste on the back side of the back surface of the tantalum substrate is not covered. At the same time, the conductive aluminum paste prepared in Examples 1 to 4 and Comparative Examples 1 and 2 was printed, and the conductive aluminum rubber and the back silver paste were partially overlapped. The printing parameters and the screen mesh number are adjusted to control different printing weights, and then re-inserted in an oven at 200 ° C to obtain a printing enamel substrate to be sintered.
步驟二(燒結)：乾燥步驟完成後，將步驟一製得之待燒結之印刷矽基材置入紅外線快速燒結爐(Despatch CF furnace)進行燒結，製得太陽能電池。 燒結步驟中，相關參數設定為Z1/Z2/Z3/Z4/Z5/Z6/speed=500℃/550℃/600℃/680℃/830℃/930℃/230ipm，該紅外線快速燒結爐係藉由輸送帶輸送該待燒結之印刷矽基材，使該待燒結之印刷矽基材通過Z1~Z6等不同的溫區，輸送帶之輸送速度(speed)係為230ipm(英寸/分鐘)。 Step 2 (Sintering): After the drying step is completed, the printing ruthenium substrate prepared in the first step is placed in a Despatch CF furnace for sintering to obtain a solar cell. In the sintering step, the relevant parameters are set to Z1/Z2/Z3/Z4/Z5/Z6/speed=500°C/550°C/600°C/680°C/830°C/930°C/230ipm, and the infrared rapid sintering furnace is used The conveyor belt conveys the printing enamel substrate to be sintered, and the printing enamel substrate to be sintered passes through different temperature zones such as Z1 to Z6, and the conveying speed of the conveyor belt is 230 ipm (inch/min).
依據上述步驟，分別使用實施例1~4及比較例1~2之導電鋁膠製作太陽能電池，就下列性質進行測試： According to the above steps, solar cells were fabricated using the conductive aluminum pastes of Examples 1 to 4 and Comparative Examples 1 and 2, respectively, and tested under the following properties:
光電轉換效率量測：使用太陽能電池片模擬測試系統，測試太陽能電池之光電轉換效率，測試機台型號為芬蘭Endeas公司生產之QuickSun 120CA。 Photoelectric conversion efficiency measurement: The solar cell photoelectric conversion efficiency was tested using a solar cell simulation test system, and the test machine model was a QuickSun 120CA produced by the Finnish Endeas company.
拉力：將EVA膜裁成1×10cm長條，將該EVA膜置於太陽能電池之背面，經過層壓機150℃熱壓三次，使該EVA膜熱壓於太陽能電池之背面，以拉力計量測EVA膜與太陽能電池之間的最大拉力值，低於1kgf為NG。 Pulling force: The EVA film is cut into 1×10cm strips, and the EVA film is placed on the back side of the solar cell, and hot pressed three times through a laminator at 150° C., so that the EVA film is hot pressed on the back surface of the solar cell, and the tensile force is measured. The maximum tensile force between the EVA film and the solar cell is measured, and below 1 kgf is NG.
耐水性：於燒杯中加入去離子水500cc後，放置在加熱板上加熱至水溫為75℃，將太陽能電池平放於底部，10分鐘之內有連續起泡即為NG。 Water resistance: After adding 500 cc of deionized water to the beaker, it was placed on a hot plate and heated to a water temperature of 75 ° C. The solar cell was placed flat on the bottom, and continuous foaming was NG within 10 minutes.
翹曲：燒結後冷卻太陽能電池1小時，使用厚薄規量測厚度，超過1.8mm即為NG。 Warpage: After cooling, the solar cell was cooled for 1 hour, and the thickness was measured using a thickness gauge. When it was over 1.8 mm, it was NG.
鋁凸：燒結後之太陽能電池表面有橘皮狀凸起，即是NG。 Aluminum convex: The surface of the solar cell after sintering has a orange peel-like convex surface, that is, NG.
上述性質之測試結果，彙整於下列表二中：
表二所示之印重係為一6吋矽基材上之導電鋁膠的印刷重量(g/6吋矽基材)，其中該6吋矽基材的印刷面積為235cm2，可換算為單位面積之印重(mg/cm2)如下：1.5g/6吋矽基材=6.3mg/cm2 1.3g/6吋矽基材=5.5mg/cm2 1.2g/6吋矽基材=5.0mg/cm2 0.8g/6吋矽基材=3.4mg/cm2 The printing weight shown in Table 2 is the printing weight (g/6 吋矽 substrate) of the conductive aluminum adhesive on a 6 吋矽 substrate, wherein the printing area of the 6 吋矽 substrate is 235 cm 2 , which can be converted into The basis weight (mg/cm 2 ) per unit area is as follows: 1.5 g / 6 吋矽 substrate = 6.3 mg / cm 2 1.3 g / 6 吋矽 substrate = 5.5 mg / cm 2 1.2 g / 6 吋矽 substrate = 5.0 mg/cm 2 0.8 g/6 吋矽 substrate = 3.4 mg/cm 2
表二中，各項測試中較差的結果係以粗體字標示。由表二之測試結果可了解到，相較於未添加釩、磷或鉬源之比較例1，實施例1~4在光電轉換效率、拉力及耐水性等性質上，具有較佳的測試結果。其中，比較例1之太陽能 電池，當導電鋁膠的印重由1.5g減少為1.3g時，光電轉換效率明顯自19.50%下降至19.35%，當印重減少至1.2g時，光電轉換效率更進一步下降至18.90%。相較之下，實施例1~4之太陽能電池，當導電鋁膠的印重由1.5g減少為1.2g甚至減少為0.8g時，光電轉換效率皆未明顯改變，可見本發明之導電鋁膠可以較低的印重印刷，而不至於降低太陽能電池的光電轉換效率。 In Table 2, the poor results in each test are indicated in bold. It can be understood from the test results of Table 2 that Examples 1 to 4 have better test results in terms of photoelectric conversion efficiency, tensile strength and water resistance compared to Comparative Example 1 in which no vanadium, phosphorus or molybdenum source is added. . Among them, the solar energy of Comparative Example 1 When the printing weight of the conductive aluminum adhesive is reduced from 1.5g to 1.3g, the photoelectric conversion efficiency is obviously reduced from 19.50% to 19.35%. When the printing weight is reduced to 1.2g, the photoelectric conversion efficiency is further reduced to 18.90%. In contrast, in the solar cells of Examples 1 to 4, when the printing weight of the conductive aluminum paste is reduced from 1.5 g to 1.2 g or even decreased to 0.8 g, the photoelectric conversion efficiency is not significantly changed, and the conductive aluminum paste of the present invention can be seen. Printing can be performed at a lower printing weight without lowering the photoelectric conversion efficiency of the solar cell.
此外，在拉力及耐水性方面，比較例1之太陽能電池，在印重為1.5g的情況下，有較佳的拉力，但耐水性不佳；在印重為1.3g或0.2g的情況下，有較佳的耐水性，但拉力不佳，可見使用未添加釩、磷或鉬源之導電鋁膠的太陽能電池，在減少印重的同時，雖可提升耐水性，但卻犧牲了拉力特性。相較之下，實施例1~4之太陽能電池，在印重為1.5g的情況下，有較佳的拉力及耐水性，且即便將導電鋁膠的印重由1.5g減少至0.8g，仍可保持較佳的拉力，可見本發明之導電鋁膠可以較低的印重印刷，而不至於降低拉力且保有優良的耐水性。 Further, in terms of tensile strength and water resistance, the solar cell of Comparative Example 1 had a preferable tensile force at a printing weight of 1.5 g, but the water resistance was poor; in the case where the printing weight was 1.3 g or 0.2 g. It has better water resistance, but the tensile strength is not good. It can be seen that the solar cell using the conductive aluminum glue without vanadium, phosphorus or molybdenum source can reduce the printing weight while improving the water resistance, but at the expense of the tensile force. . In contrast, the solar cells of Examples 1 to 4 have better tensile strength and water resistance at a printing weight of 1.5 g, and even if the printing weight of the conductive aluminum rubber is reduced from 1.5 g to 0.8 g, It is still possible to maintain a good tensile force, and it can be seen that the conductive aluminum paste of the present invention can be printed with a lower printing weight without lowering the tensile force and maintaining excellent water resistance.
本發明之導電鋁膠，其可以較低印重印刷之特性，可節省太陽能電池製造商之每瓦生產成本。 The conductive aluminum glue of the invention can be printed with lower printing weight, and can save the cost per watt of the solar cell manufacturer.
再者，由表二之測試結果可了解到，相較於添加>0.5wt%的釩、磷或鉬源之比較例2，實施例1~4係添加≦0.5wt%的釩、磷或鉬源，實施例1~4之太陽能電池在光電轉換效率、翹曲及鋁凸等性質上，具有較佳的測試結果。可見，本發明之導電鋁膠中釩、磷或鉬源的添加量應以≦0.5wt%為佳。 Furthermore, it can be understood from the test results of Table 2 that Examples 1 to 4 are added with 0.5% by weight of vanadium, phosphorus or molybdenum as compared with Comparative Example 2 with >0.5 wt% of vanadium, phosphorus or molybdenum source added. The solar cells of Examples 1 to 4 have better test results in terms of photoelectric conversion efficiency, warpage, and aluminum convexity. It can be seen that the vanadium, phosphorus or molybdenum source in the conductive aluminum paste of the present invention should be added in an amount of 0.5% by weight.
本發明在上文中已以較佳實施例揭露，然熟習本項技術者應理解的是，該實施例僅用於描繪本發明，而不應解讀為限制本發明之範圍。應注意的是，舉凡與該實施例等效之變化與置換，均應設為涵蓋於本發明之範疇內。因此，本發明之保護範圍當以申請專利範圍所界定者為準。 The invention has been described above in terms of the preferred embodiments, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the patent application.
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| CN102318013A (en) * | 2009-03-27 | 2012-01-11 | 株式会社日立制作所 | Conductive paste and electronic part equipped with electrode wiring formed from same |
| TW201335098A (en) * | 2011-11-09 | 2013-09-01 | Hitachi Chemical Co Ltd | Electronic component, conductive paste for aluminum electrodes used in same, and glass composition for aluminum electrodes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102318013A (en) * | 2009-03-27 | 2012-01-11 | 株式会社日立制作所 | Conductive paste and electronic part equipped with electrode wiring formed from same |
| TW201335098A (en) * | 2011-11-09 | 2013-09-01 | Hitachi Chemical Co Ltd | Electronic component, conductive paste for aluminum electrodes used in same, and glass composition for aluminum electrodes |
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