CN107004456B - 导电性组合物作为导电性粘着剂的用途 - Google Patents
导电性组合物作为导电性粘着剂的用途 Download PDFInfo
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- CN107004456B CN107004456B CN201580064120.0A CN201580064120A CN107004456B CN 107004456 B CN107004456 B CN 107004456B CN 201580064120 A CN201580064120 A CN 201580064120A CN 107004456 B CN107004456 B CN 107004456B
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Abstract
本发明涉及一种导电性组合物作为导电性粘着剂以用于机械和电连接太阳能电池的至少一个触点与电导体的用途,其中所述至少一个触点选自由发射极触点和集极触点组成的群组,其特征在于所述导电性组合物包含(A)2到35vol%银粒子,其平均粒度在1到25μm范围内并且呈现在5到30:1范围内的纵横比,(B)10到63vol%非金属粒子,其平均粒度在1到25μm范围内,呈现在1到3:1范围内的纵横比,(C)30到80vol%可固化树脂***,和(D)0到10vol%的至少一种添加剂,其中粒子(A)和(B)的vol%总和总计是25到65vol%。
Description
本发明涉及一种导电性组合物作为导电性粘着剂以用于机械和电连接电导体与太阳能电池的电触点的用途。
太阳能电池可以将例如日光的光转换成电能。有可能从一个单体太阳能电池收集电能。为了将由单个太阳能电池输送的电压增加到适合水平,多个太阳能电池常规地以串联方式电连接在一起,以形成可并入光伏打模块中的太阳能电池数组。太阳能电池的电能收集和电连接典型地经由电导体作出,所述电导体机械和同时电连接到太阳能电池的发射极和集极触点。电导体与电池触点的机械和同时的电连接典型地通过焊接或通过粘接进行,在后一情况中使用导电性粘着剂。
本文中所使用的术语“电导体”意谓常规电导体,如例如常规线、带、带状物或导电背片箔(背面接触箔)。
本文中所使用的术语“发射极触点”意谓连接太阳能电池的发射极与电导体的电触点,而本文中所使用的术语“集极接点”意谓连接太阳能电池的集极与电导体的电触点。电触点呈金属化物的形式。
在现今的大多数光伏打模块中,太阳能电池具有位于电池的相对侧上的发射极触点和集极触点。发射极触点位于前表面(即暴露于日光的表面)上,然而集极触点在背侧上。一实例是H型电池,其典型地具有两个在其前面上的称为发射极母线的发射极触点,和两个在其背面上的也称为集极母线的集极触点。技术人员将认识到发射极触点和集极触点的极性相反。
已开发新电池类型,其中发射极触点已从太阳能电池前面移动到背面,以便释放前表面的额外部分并且增加可由电池产生的电能的量。发射极和集极触点位于电池背侧上的所述太阳能电池以常用名称“背面接触电池”已知,所述名称包括金属化绕通(MWT)电池、背面接合(BJ)电池、集成背面接触(IBC)电池和发射极绕通(EWT)电池。在这些背面接触电池的情况下,发射极触点是位于电池背面上的所谓“通孔”或“背面发射极触点”,而集极触点也位于电池背面上。
现今的大多数太阳能电池是硅太阳能电池。
常规导电性粘着剂包含数量级是约80wt%(重量%)的很大一部分的银粒子。由于较高的银价格,就由例如镀银铜粒子的镀银粒子替换相当大部分的银粒子来说,已开发所谓的低银替代物。然而,使用所述类型的含铜导电性粘着剂以用于粘接电导体与太阳能电池触点存在担忧,尤其在硅太阳能电池的情况下。理由是太阳能电池打算用于长期使用,这放大了以下风险:在太阳能电池使用寿命期间铜扩散进入太阳能电池整体材料中,并且因此形成减少再结合中心的不当效率,或甚至破坏太阳能电池的p-n或n-p转变。这在硅太阳能电池的情况下尤其是一担忧。然而,所述担忧不仅在铜的情况下适用,并且也在具有与铜类似作用的其它元素的情况下适用。所述元素的实例包括磷、钛、钒、铬、锰、铁、钴、镍、锆、铌、钼、钽和钨,参见“荷兰能源研究中心(Energy research Centre of theNetherlands),詹卢卡科莱蒂(Gianluca Coletti),结晶硅太阳能电池对金属杂质的敏感性(Sensitivity of crystalline silicon solar cells to metal impurities),2011年9月14日”或“J.R.戴维斯(J.R.Davis),国际电子电器工程师电子器件杂志(IEEE TransEl.Dev.)ED-27,677(1980)”。
本发明通过使用特定导电性低银型粘着剂以用于机械和同时电连接太阳能电池的触点与电导体来预防所述风险。在一实施例中,在导电性粘着剂中,基本上或完全避免呈元素或金属形式或呈合金形式的元素铜、磷、钛、钒、铬、锰、铁、钴、镍、锆、铌、钼、钽、铝和钨。
因此,本发明涉及一种导电性组合物作为导电性粘着剂以用于机械和同时电连接太阳能电池、优选硅太阳能电池的至少一个触点与电导体的用途,其中所述至少一个触点选自由发射极触点和集极触点组成的群组,其特征在于导电性组合物包含
(A)2到35vol%(体积%)银粒子,其平均粒度在1到25μm范围内并且呈现在5到30:1范围内的纵横比,
(B)10到63vol%非金属粒子,其平均粒度在1到25μm范围内,呈现在1到3:1范围内的纵横比,
(C)30到80vol%可固化(可硬化、可交联)树脂***,和
(D)0到10vol%的至少一种添加剂,
其中粒子(A)和(B)的vol%总和总计是25到65vol%。
在说明书和权利要求书中,使用术语“太阳能电池”。其不应意谓对于某一类型的太阳能电池的任何限制。其包括任何类型的太阳能电池,尤其包括硅太阳能电池。电池可以是例如在前提及的H或背面接触电池类型。
在一实施例中,(A)、(B)、(C)和如果存在(D)的vol%总和可总计是导电性组合物的100vol%。
说明书和权利要求书中所揭示的vol%涉及导电性组合物,即尚未固化,或甚至更精确地涉及根据本发明在其涂覆或使用之前的导电性组合物。
在说明书和权利要求书中使用术语“平均粒度”。其应意谓借助于激光衍射测定的平均初始粒径(d50)。激光衍射测量可使用例如来自马尔文仪器(Malvern Instruments)的粒度分析仪3000的粒度分析仪进行。
在说明书和权利要求书中,关于导电性组合物中所包括的粒子(A)和(B)的形状,使用术语“纵横比”。纵横比意谓粒子的最大尺寸与最小尺寸的比,并且其通过SEM(扫描电子显微法)和通过测量统计上有意义的很多单个粒子的尺寸评估电子显微图像来测定。
导电性组合物包含2到35vol%、优选2到30vol%并且最优选2到20vol%的银粒子(A),其平均粒度在1到25μm、优选1到20μm、最优选1到15μm范围内,并且呈现在5到30:1、优选6到20:1、最优选7到15:1范围内的纵横比。银粒子(A)可具有涂层,所述涂层包含至少一种有机化合物,尤其C8到C22脂肪酸或其衍生物如盐或酯。vol%值包括银粒子(A)上的所述涂层的体积贡献。
银粒子(A)包括银和银合金的粒子;即本文中所使用的术语“银粒子”应意谓纯银和/或银合金的粒子。在银合金的情况下,合金金属的总比例是例如>0到5wt%,优选是>0到1wt%。银合金可包含银和一种其它金属的二元合金或银与多于一种不为银的金属的合金。可用作银的合金金属的金属的实例尤其包括锌、铑、钯、铟、锡、锑、铼、锇、铱、铂、金、铅和铋。在一实施例中,排除铜、磷、钛、钒、铬、锰、铁、钴、镍、锆、铌、钼、钽、铝和钨作为合金元素。
银粒子(A)显示在5到30:1、优选6到20:1、最优选7到15:1范围内的纵横比。所述纵横比应表示银粒子(A)是例如与例如具有球形、基本上球形、椭圆或卵形形状的粒子相对的针状粒子(针)或薄片(小板)。
导电性组合物可包含一种类型的银粒子(A)或两种或多于两种不同类型的银粒子(A)的组合。在任何情况下,导电性组合物中所含有的所有类型银粒子(A)符合在前提及的平均粒度和纵横比条件。为说明这点,可设想以下理论实例:导电性组合物可包含两种不同类型的银粒子作为唯一粒子(A),即X vol%的d50值是xμm并且纵横比是y:1的银粒子,和Yvol%的d50值是vμm并且纵横比是w:1的银粒子,其中X+Y在所述2到35vol%范围内,x和v独立地在所述1到25μm范围内,并且y和w独立地在所述5到30:1范围内。
类型(A)的银粒子可于市面购得。所述银粒子的实例包括来自艾姆斯戈德史密斯(Ames Goldsmith)的SF-3、SF-3J;来自福禄(Ferro)的银片(Silver Flake)#80;来自美泰乐(Metalor)的RA-0101、AA-192N。
在一实施例中,导电性组合物可包含一部分,例如10到30vol%的不为类型(A)的银粒子的银粒子,特定来说纵横比在例如1到<5:1或1到3:1范围内的银粒子。所述银粒子的一个市售实例是来自美泰乐的FA-3162。
导电性组合物包含10到63vol%、优选15到63vol%并且最优选15到60vol%的非金属粒子(B),其平均粒度在1到25μm、优选1到20μm、最优选1到15μm范围内,并且呈现在1到3:1、优选1到2:1、最优选1到1.5:1范围内的纵横比。(B)类型的适用粒子的实例包括石墨粒子和非导电性非金属粒子,在每一情况下符合所述平均粒度和纵横比条件。本文中所使用的术语“非导电性非金属粒子”应意谓电导率<10-5S/m的材料的非金属粒子。所述材料的实例包括玻璃、陶瓷、塑料、钻石、氮化硼、二氧化硅、氮化硅、碳化硅、铝硅酸盐、氧化铝、氮化铝、氧化锆和二氧化钛。
非金属粒子(B)显示在1到3:1、优选1到2:1、最优选1到1.5:1范围内的纵横比。所述纵横比应表示粒子(B)具有与如例如针状粒子或薄片的粒子相反的真实球形或基本上球形形状。单个粒子(B)当在电子显微镜下观察时具有类似球或接近类似球的形状,即其可完美地是圆或近似圆、椭圆的或其可具有卵形形状。
导电性组合物可包含一种类型的粒子(B)或两种或多于两种不同类型的粒子(B)的组合。在任何情况下,导电性组合物中所含有的所有类型粒子(B)符合在前提及的平均粒度和纵横比条件。
类型(B)的粒子市售。实例包括来自雅都玛(Admatechs)的AE9104;来自AMG矿业(AMG Mining)的EDM99,5;来自安迈(Almatis)的CL4400、CL3000SG;来自西格玛阿尔德里奇(Sigma Aldrich)的玻璃球(Glass Spheres);来自的CA6、CA10、CA15。
在一优选实施例中,银粒子(A)的平均粒度在是非金属粒子(B)的平均粒度的0.2到2倍范围内。
银粒子(A)和非金属粒子(B)的vol%总和总计是25到65vol%。
导电性组合物包含30到80vol%、优选30到75vol%并且最优选30到70vol%的可固化树脂***(C)。
可固化树脂***(C)包含导电性组合物的那些成分,所述成分在其涂覆并且固化后形成包埋有(A)和(B)粒子的共价交联的聚合物基质。
“可固化树脂***”意谓一树脂***:包含至少一种典型地与起始剂或引发剂组合的可自交联树脂,和/或一或多种与一或多种用于一或多种可交联树脂的硬化剂(交联剂、固化剂)组合的可交联树脂。然而,非反应性树脂存在于所述可固化树脂***内也是可能的。为避免误解,术语“树脂***”虽然一般理解为涉及聚合材料,但不应理解为不包括寡聚材料的任选存在。寡聚材料可包括反应性调薄剂(反应性稀释剂)。寡聚和聚合材料之间的界限由重量平均摩尔质量定义,所述重量平均摩尔质量通过凝胶渗透色谱法(GPC;二乙烯基苯交联的聚苯乙烯作为固定相,四氢呋喃作为液相,聚苯乙烯标准品)测定。寡聚材料的重量平均摩尔质量≤500,而聚合材料的重量平均摩尔质量>500。
典型地,可固化树脂***(C)的成分是非挥发性的;然而也可存在可涉及可固化树脂***的固化机制的挥发性化合物。
可固化树脂***(C)可通过形成共价键固化。共价键形成固化反应可以是自由基聚合、缩合和/或加成反应,其中缩合反应次佳。
如之前已提及,可固化树脂***(C)包含导电性组合物的在其涂覆并且固化后形成共价交联的聚合物基质或聚合物网状结构的那些成分。这种聚合物基质可以是任何类型,即其可包含一或多种聚合物,或两种或多于两种不同聚合物的一或多种混合物。可能聚合物的实例可包括(甲基)丙烯酰基共聚物、聚酯、聚氨基甲酸酯、聚硅氧烷、聚醚、环氧-胺-聚合加合物和任何组合。形成所述聚合物基质的聚合物可来源于可固化树脂***(C)的聚合组分,并且/或可在涂覆后的可固化树脂***(C)的聚合物形成固化反应期间和在导电性组合物的固化期间形成。
因此,一或多种可以是可固化树脂***(C)的成分的树脂可选自例如(甲基)丙烯酰基共聚物树脂、聚酯树脂、聚氨基甲酸酯树脂、聚硅氧烷树脂、包括环氧树脂型聚醚树脂的聚醚树脂、环氧-胺-聚合加合物和其混合物。
可固化树脂***(C)的可自交联树脂可以是携有能够在形成共价键下在交联网状结构形成的意义上相互间反应的官能团的树脂。在替代方案中,可自交联树脂是在同一个分子中携有不同官能团(F1)和(F2)的树脂,其中官能团(F2)显示与官能团(F1)的官能度互补的反应性官能度。可交联树脂与硬化剂的组合意谓可交联树脂携有官能团(F1),而硬化剂携有显示与官能团(F1)的官能度互补的反应性官能度的其它官能团(F2)。所述互补官能团(F1)/(F2)的实例是:羧基/环氧基、羟基/异氰酸酯基、环氧基/胺、可自由基聚合烯烃双键/可自由基聚合烯烃双键等等。互补官能团(F1)/(F2)的反应在任何情况下导致形成共价键,结果是形成共价交联的聚合物网状结构。
在一优选实施例中,可固化树脂***(C)包含可自交联环氧树脂或环氧树脂和用于环氧树脂的硬化剂的***,所述硬化剂选自多胺硬化剂、聚羧酸硬化剂和聚羧酸酐硬化剂。环氧树脂和用于环氧树脂的多胺硬化剂的***可任选地包含内酯。
包含可自交联环氧树脂的可固化树脂***(C)可包含起始剂或引发剂。其可以是阳离子可固化***。为引发阳离子固化,其需要可以是热不稳定或UV不稳定的阳离子引发剂。因此,包含可自交联环氧树脂的阳离子可固化树脂***(C)可以是热可固化或UV可固化树脂***。
适用环氧树脂的实例是双酚A和/或双酚F环氧树脂、酚醛环氧树脂、脂肪族环氧树脂和环脂肪族环氧树脂。所述市售环氧树脂的实例包括来自亨斯迈(Huntsman)的GY 279、GY 891、PY 302-2、PY 3483、GY 281和1010;来自陶氏化学(Dow Chemical)的D.E.R.TM 331、D.E.R.TM 732、D.E.R.TM 354和D.E.NTM 431;来自三菱化学(Mitsubishi Chemical)的JER YX8000;和来自迈图特用化学品公司(Momentive Specialty Chemicals)的EPONEXTM树脂1510。
适用多胺硬化剂的实例是每分子包含多于一种一级或二级氨基的化合物。典型的实例是在分子中具有至少两个氨基的二胺、三胺和其它多胺,其中氨基选自一级和二级氨基。二级氨基可呈现为侧向或末端官能团或呈现为杂环成员。优选多胺硬化剂的实例包括二亚乙基三胺、乙二胺、三亚乙基四胺、氨基乙基哌嗪和来自亨斯迈的D230。
适用聚羧酸硬化剂的实例包括甲基六氢邻苯二甲酸和其可能的酐。
适用阳离子引发剂的实例是六氟锑酸1-(对甲氧基苯甲基)四氢噻吩鎓。
适用内酯的实例是△-戊内酯、△-己内酯、△-壬内酯、△-癸内酯、△-十一内酯、γ-丁内酯、γ-己内酯、γ-庚内酯、γ-辛内酯、ε-己内酯、ε-辛内酯、ε-壬内酯和其混合物。
导电性组合物包含0到10vol%的至少一种添加剂(D)。
添加剂的实例包括4-环己烷二甲醇二乙烯醚;有机溶剂,例如异丙醇、正丙醇、萜品醇;湿润剂,例如油酸;流变改质剂,例如纳米级二氧化硅、乙基纤维素。
迄今为止,导电性组合物的组成以vol%状观察。在一实施例中,导电性组合物包含15到60wt%银粒子(A)、10到75wt%非金属粒子(B)、7到35wt%可固化树脂***(C),和(D)0到5wt%的至少一种添加剂,其中(A)和(B)的wt%总和总计是60到93wt%,并且其中(A)、(B)、(C)和如果存在(D)的wt%总和可总计是导电性组合物的100wt%。说明书和权利要求书中所揭示的wt%涉及导电性组合物,即尚未固化的,或甚至更精确地涉及在其根据本发明使用之前的导电性组合物。
优选地,根据DIN 53018(在23℃下,CSR-测量,圆锥-板***,剪切速率是每秒50转)所测量,导电性组合物的粘度在4到45Pa·s、最优选8到35Pa·s范围内。
导电性组合物可通过混合组分(A)、(B)、(C)和任选的(D)来制备,其中优选在添加组分(A)和(B)之前首先引入组分(C)。完成混合后,可储存因此产生的导电性组合物直到其根据本发明而使用。可宜在例如-78到+8℃的低温下储存导电性组合物。
视(C)组分的化学性质而定并且如果需要或适宜,也有可能将组分(C)分离成子组分,例如分离成可固化树脂子组分(C1)和硬化剂子组分(C2),并且混合(A)、(B)、(C1)和任选的(D),并且将所述混合物与(C2)分开储存。如此,获得双组分类型的导电性组合物。其两种组分彼此分开储存直到根据本发明使用导电性组合物。随后涂覆前不久或即刻混合两种组分。
根据本发明使用导电性组合物,即其用作导电性粘着剂以用于机械和同时电连接太阳能电池的至少一个触点与电导体,其中至少一个触点选自由太阳能电池发射极触点和太阳能电池集极触点组成的群组。
为此目的,将导电性组合物涂覆到太阳能电池的至少一个触点的接触表面和/或电导体的接触表面,所述电导体粘接到太阳能电池的至少一个触点。典型地,如之前已在解释发射极和集极触点的段落中所提及,太阳能电池的触点的接触表面是金属化物。电导体的接触表面可以是线、带或带状物的末端和/或其它适合地点。在电导体呈导电背片箔形式的情况下,其接触表面典型地呈经设计以装配太阳能电池的至少一个触点的图案的形式。
可例如通过印刷(例如网板印刷或模板印刷)、通过喷射或通过分配来进行导电性组合物的涂覆。经涂覆并且未固化的导电性组合物的典型厚度处于例如20到500μm范围内。
涂覆导电性组合物后,将一或多个太阳能电池触点和粘接到其上的电导体放在一起,其中具有导电性组合物的其接触表面在两者之间。
固化之前,即在涂覆后并且将一或多个太阳能电池触点和电导体放在一起之前或之后,可进行一任选的干燥步骤,以便从导电性组合物去除最终存在的挥发性化合物,如例如有机溶剂。如果进行所述干燥步骤,那么干燥参数是在例如60到160℃的目标温度下例如1到120分钟。
随后固化包含导电性组合物的因此形成的组合件,即固化导电性组合物。如果待要粘接的接触表面中的至少一个对UV光足够透明和/或允许UV光充分进入,并且如果(C)***的固化化学允许UV固化,那么固化可通过UV照射引发。UV可固化(C)***的实例是已经提及的可固化树脂***(C),其包含可自交联环氧树脂和UV不稳定阳离子引发剂;或包含可自由基聚合的组分和UV不稳定自由基引发剂的可固化树脂***(C)。在热固化的更常用替代方案中,施加热并且在例如80到160℃的目标温度下加热包括导电性组合物的组合件例如5到30分钟。如将在下文更详细地揭示,热固化可在单独步骤中进行或其可在组装并且固结光伏打模块或光伏打堆栈过程中发生。
在硬化状态中导电性组合物是固体。
完成固化后,电导体附接到触点的太阳能电池或通过电导体彼此连接的太阳能电池数组可用于产生电能,或尤其其可并入常规光伏打模块中。为此目的,可例如通过以下方式组装光伏打堆栈或光伏打模块:将常规背封装层放置于常规背片上、将太阳能电池或太阳能电池数组放置于背封装层的顶部上、将常规前封装层放置于一或多个太阳能电池的顶部上并且随后将常规前片放置于前封装层的顶部上。典型地,随后将因此组装的光伏打堆栈通过以下方式固结于层压装置中:加热堆栈,并且使经加热光伏打堆栈在垂直于堆栈平面的方向上经历机械压力,并且减少层压装置中的环境压力。加热使得前和背封装剂***,在一或多个太阳能电池周围流动并且粘着到一或多个太阳能电池,并且如果尚未进行,那么热固化导电性组合物;即在后一情况中热固化在固结光伏打堆栈期间发生。最后,将光伏打堆栈冷却到环境温度并且释放机械压力并且在层压装置中重建大气压。
实例
实例1a(制备导电性组合物):
通过混合69pbw(重量份)来自亨斯迈的PY 302-2、4pbw六氟锑酸1-(对甲氧基苯甲基)四氢噻吩鎓、21pbw来自亨斯迈的DY-E(反应性稀释剂)和6pbw油酸来制备类型(C)和(D)的组分的混合物。
混合13vol%(40wt%)来自美泰乐的AA-192N((A)型粒子)、31vol%(40wt%)来自雅都玛的AE9104((B)型粒子)和56vol%(20wt%)的类型(C)和(D)的组分的混合物。通过以下方式进行混合:将组分(C)和(D)的混合物引入烧杯中,并且随后借助于刮勺与其它组分混合,随后用浆混合器在300到400U/min下混合5分钟。其后,在三重辊筒研磨机中在21℃下将混合物研磨两次,随后用浆混合器在小于10毫巴下在搅拌下抽空20分钟。
实例1b(制备导电性组合物):
通过混合63pbw来自陶氏化学的D.E.R.TM 732、8pbw来自四国(Shikoku)的C2E4MZ硬化剂、23pbw来自亨斯迈的DY-E、4pbw 4-环己烷二甲醇二乙烯醚和2pbw油酸来制备类型(C)和(D)的组分的混合物。
混合17vol%(50wt%)来自艾姆斯戈德史密斯的SF-3J((A)型粒子)、24vol%(30wt%)来自安迈的CL3000SG((B)型粒子)和59vol%(20wt%)的类型(C)和(D)的组分的混合物。通过以下方式进行混合:将组分(C)和(D)的混合物引入烧杯中,并且随后借助于刮勺与其它组分混合,随后用浆混合器在300到400U/min下混合5分钟。其后,在三重辊筒研磨机中在21℃下将混合物研磨两次,随后用浆混合器在小于10毫巴下在搅拌下抽空20分钟。
实例1c(制备导电性组合物):
通过混合69pbw来自陶氏化学的D.E.R.TM 732、4pbw六氟锑酸1-(对甲氧基苯甲基)四氢噻吩鎓、21pbw来自亨斯迈的DY-E和6pbw油酸来制备类型(C)和(D)的组分的混合物。
混合17vol%(50wt%)来自艾姆斯戈德史密斯的SF-3J((A)型粒子)、24vol%(30wt%)来自安迈的CL3000SG((B)型粒子)和59vol%(20wt%)的类型(C)和(D)的组分的混合物。通过以下方式进行混合:将组分(C)和(D)的混合物引入烧杯中,并且随后借助于刮勺与其它组分混合,随后用浆混合器在300到400U/min下混合5分钟。其后,在三重辊筒研磨机中在21℃下将混合物研磨两次,随后用浆混合器在小于10毫巴下在搅拌下抽空20分钟。
实例1d(制备导电性组合物):
通过混合63pbw来自亨斯迈的PY 302-2、8pbw来自四国的C2E4MZ、23pbw来自亨斯迈的DY-E、4pbw 4-环己烷二甲醇二乙烯醚和2pbw油酸来制备类型(C)和(D)的组分的混合物。
混合13vol%(40wt%)来自美泰乐的AA-192N((A)型粒子)、31vol%(40wt%)来自雅都玛的AE9104((B)型粒子)和56vol%(20wt%)的类型(C)和(D)的组分的混合物。通过以下方式进行混合:将组分(C)和(D)的混合物引入烧杯中,并且随后借助于刮勺与其它组分混合,随后用浆混合器在300到400U/min下混合5分钟。其后,在三重辊筒研磨机中在21℃下将混合物研磨两次,随后用浆混合器在小于10毫巴下在搅拌下抽空20分钟。
实例2(生产光伏打堆栈):
经由模板印刷以400μm的厚度将实例1的导电性组合物涂覆到MWT太阳能电池(来自晶澳太阳能(JA Solar)的JACP6WR-0)的背侧发射极和集极触点。
同时将来自康维明(Coveme)的穿孔介电层放置于导电背片箔(来自康维明的背片背面接触(Backsheet Back-contact))上以形成堆栈。其后放置太阳能电池,其中具备导电性组合物的其背侧面向堆栈的穿孔介电层。在太阳能电池前侧的顶部上,放置来自3MTM的太阳能密封膜(Solar Encapsulant Film)EVA9100的薄片。将玻璃片(来自vetro solarTM的vsol)放置于密封膜的顶部上。
随后在施加热和机械压力下层压整个堆栈。首先,以13℃/min的速率将温度增加到150℃。在80℃下将1巴的机械压力逐渐并且均匀地施加于堆栈的顶面和底面上。9分钟后,在150℃下以25℃/分钟的速率冷却堆栈,直到堆栈达到20℃。达到80℃后,将机械压力降到零。
Claims (14)
1.一种导电性组合物作为导电性粘着剂以用于机械和电连接太阳能电池的至少一个触点与电导体的用途,其中所述至少一个触点选自由发射极触点和集极触点组成的群组,其特征在于
所述导电性组合物包含
2到35vol%银粒子,其平均粒度在1到25μm范围内并且呈现在5到30:1范围内的纵横比,
10到63vol%非金属粒子,其平均粒度在1到25μm范围内,呈现在1到3:1范围内的纵横比,
30到80vol%可固化树脂***,和
0到10vol%的至少一种添加剂,
其中所述银粒子和所述非金属粒子的vol%总和总计是25到65vol%。
2.根据权利要求1所述的用途,
其中所述银粒子、所述非金属粒子、所述可固化树脂***、和如果存在的所述至少一种添加剂的vol%总和总计是所述导电性组合物的100vol%。
3.根据权利要求1或2所述的用途,
其中所述银粒子是纯银和/或银合金的粒子。
4.根据权利要求1或2所述的用途,
其中所述非金属粒子选自由以下组成的群组:石墨粒子、玻璃粒子、陶瓷粒子、塑料粒子、钻石粒子、氮化硼粒子、二氧化硅粒子、氮化硅粒子、碳化硅粒子、铝硅酸盐粒子、氧化铝粒子、氮化铝粒子、氧化锆粒子和二氧化钛粒子。
5.根据权利要求1或2所述的用途,
其中所述银粒子的平均粒度在所述非金属粒子的平均粒度的0.2到2倍范围内。
6.根据权利要求1或2所述的用途,
其中所述可固化树脂***包含成分,在涂覆并且固化所述成分后形成包埋有所述银粒子和所述非金属粒子的共价交联的聚合物基质。
7.根据权利要求1或2所述的用途,
其中所述可固化树脂***包含可自交联环氧树脂或环氧树脂和用于所述环氧树脂的硬化剂的***,所述硬化剂选自多胺硬化剂、聚羧酸硬化剂和聚羧酸酐硬化剂中的一种或多种。
8.根据权利要求7所述的用途,
其中所述可固化树脂***包含环氧树脂、用于所述环氧树脂的多胺硬化剂和任选的内酯的***。
9.根据权利要求1或2所述的用途,
其中所述导电性组合物涂覆到所述太阳能电池的所述至少一个触点的接触表面和/或待粘接到所述太阳能电池的所述至少一个触点的所述电导体的接触表面。
10.根据权利要求9所述的用途,
其中所述导电性组合物的所述涂覆通过印刷、喷射或分配进行。
11.根据权利要求9所述的用途,
其中在涂覆所述导电性组合物后,将所述一或多个太阳能电池触点和待与其粘接的所述电导体放在一起,使它们的具有所述导电性组合物的接触表面介于其间,以形成组合件。
12.根据权利要求11所述的用途,
其中使所述组合件所包含的所述导电性组合物固化。
13.根据权利要求12所述的用途,
其中所述固化是热固化。
14.根据权利要求13所述的用途,
其中所述热固化在单独步骤中进行或在组装并且固结光伏打堆栈过程中发生。
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EP15150720.9A EP3043354B1 (en) | 2015-01-12 | 2015-01-12 | Use of an electrically conductive composition as an electrically conductive adhesive for mechanically and electrically connecting electrical conductors to electrical contacts of solar cells |
EP15150720.9 | 2015-01-12 | ||
PCT/EP2015/077745 WO2016113026A1 (en) | 2015-01-12 | 2015-11-26 | Use of an electrically conductive composition as an electrically conductive adhesive for mechanically and electrically connecting electrical conductors to electrical contacts of solar cells |
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EP (1) | EP3043354B1 (zh) |
CN (1) | CN107004456B (zh) |
ES (1) | ES2663623T3 (zh) |
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EP3276693A1 (en) * | 2016-07-28 | 2018-01-31 | Heraeus Deutschland GmbH & Co. KG | Solar cells with conductive polymer passivation layers on the back side |
EP3604473B1 (en) * | 2017-03-31 | 2021-04-28 | Tanaka Kikinzoku Kogyo K.K. | Electroconductive adhesive composition |
CN110776848A (zh) * | 2019-10-14 | 2020-02-11 | 林雨露 | 一种与金属Cu界面可靠连接的银粉导电胶 |
EP3943564B1 (en) * | 2020-07-21 | 2024-07-17 | Henkel AG & Co. KGaA | Room temperature stable, electrically conductive 1k epoxy formulation |
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CN101000810A (zh) * | 2007-01-05 | 2007-07-18 | 华南理工大学 | 导电组合物 |
EP2058868A1 (en) * | 2006-08-29 | 2009-05-13 | Hitachi Chemical Company, Ltd. | Conductive adhesive film and solar cell module |
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US5057245A (en) * | 1990-04-17 | 1991-10-15 | Advanced Products, Inc. | Fast curing and storage stable thermoset polymer thick film compositions |
JPH06333416A (ja) * | 1993-05-21 | 1994-12-02 | Hitachi Chem Co Ltd | 導電ペースト |
EP0653763A1 (en) * | 1993-11-17 | 1995-05-17 | SOPHIA SYSTEMS Co., Ltd. | Ultraviolet hardenable, solventless conductive polymeric material |
AU2008204335B2 (en) * | 2007-01-11 | 2013-06-13 | Michael Bacher | Diagnosis and treatment of Alzheimer's and other neurodementing diseases |
MY153335A (en) * | 2009-02-16 | 2015-01-29 | Cytec Tech Corp | Conductive surfacing films for lightning strike and electromagnetic interferance shielding of thermoset composite materials |
WO2014159792A1 (en) * | 2013-03-14 | 2014-10-02 | Dow Corning Corporation | Curable silicone compositions, electrically conductive silicone adhesives, methods of making and using same, and electrical devices containing same |
KR102214300B1 (ko) * | 2013-04-17 | 2021-02-09 | 헨켈 아게 운트 코. 카게아아 | 전기 전도성 잉크 |
US20140374671A1 (en) * | 2013-06-24 | 2014-12-25 | Xerox Corporation | Conductive metal inks with polyvinylbutyral and polyvinylpyrrolidone binder |
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- 2015-01-12 ES ES15150720.9T patent/ES2663623T3/es active Active
- 2015-11-26 CN CN201580064120.0A patent/CN107004456B/zh active Active
- 2015-11-26 WO PCT/EP2015/077745 patent/WO2016113026A1/en active Application Filing
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EP2058868A1 (en) * | 2006-08-29 | 2009-05-13 | Hitachi Chemical Company, Ltd. | Conductive adhesive film and solar cell module |
CN101000810A (zh) * | 2007-01-05 | 2007-07-18 | 华南理工大学 | 导电组合物 |
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CN107004456A (zh) | 2017-08-01 |
TWI675089B (zh) | 2019-10-21 |
US20170369745A1 (en) | 2017-12-28 |
WO2016113026A1 (en) | 2016-07-21 |
EP3043354A1 (en) | 2016-07-13 |
US20190119533A1 (en) | 2019-04-25 |
ES2663623T3 (es) | 2018-04-16 |
EP3043354B1 (en) | 2018-01-03 |
TW201634638A (zh) | 2016-10-01 |
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