CN106297956A - 一种晶体硅太阳能电池用正银浆料及其制备方法 - Google Patents
一种晶体硅太阳能电池用正银浆料及其制备方法 Download PDFInfo
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Abstract
本发明涉及电子材料技术领域,尤其是一种晶体硅太阳能电池用正银浆料,各组分的质量百分含量为:0.1~6%聚硅氧烷产品,1~90%银粉,5~15%有机载体,1~8%玻璃粉,助剂0~3%,各组分含量之和为100%。所述聚硅氧烷产品可以是直链的或有支链,氢基被氨基、乙基、苯基、氯苯基、三氟丙基、硝基、羟基等替代的聚硅氧烷,含量优选为0.1~6%。本发明浆料中添加了聚硅氧烷,降低银浆在烧结过程中产生的拓宽现象,提高浆料的栅线高宽比,使得浆料在烧结过程中保持极佳的栅线形状。
Description
技术领域
本发明涉及电子材料技术领域,尤其是一种晶体硅太阳能电池用正银浆料及其制备方法。
背景技术
太阳能是人类取之不尽、用之不竭的可再生能源,也是清洁、不产生任何环境污染的能源。在太阳能有效利用当中,太阳能光电转换利用是近年来发展最快,也是最具活力的研究领域。
太阳能电池银浆是制造太阳能电池的主要原料之一,太阳能电池银浆制备技术是高效低成本太阳能电池的关键技术。太阳能电池银浆是制造太阳能电池的重要原材料,据测算,浆料成本约占太阳能电池成本的15-20%,太阳能电池银浆制造技术是高效低成本太阳能电池的关键技术。进一步提高电池的光电转换效率和降低制作成本是太阳能电池制造业追求的永恒目标。
光伏行业一般将正面电极的的实现称为金属化工艺,在金属化工艺实现中主要的三个参与者是银粉、玻璃粉和硅基底。目前,国内企业在正面银浆方面遇到的问题主要是产品的效率方面,印刷应用性方面和国外大厂的差距明显,那么银浆方面应用中主要问题是高宽比,目前太阳能电池的正面细栅存在明显的烧结变宽现象对高宽比影响很大。
发明内容
为了克服现有的技术的不足,本发明提供了一种晶体硅太阳能电池用正银浆料及其制备方法。
本发明解决其技术问题所采用的技术方案是:一种晶体硅太阳能电池用正银浆料,其组分如下:
1~90% 银粉,
0.1~6% 聚硅氧烷,
5~15% 有机载体,
1~8% 玻璃粉;
0~3% 助剂。
本方案中银粉为导电材料。本发明浆料中添加了聚硅氧烷,降低银浆在烧结过程中产生的拓宽现象,提高浆料的栅线高宽比,使得浆料在烧结过程中保持极佳的栅线形状。
根据本发明的另一个实施例,进一步包括,所述银粉为导电材料,平均粒径0.5~3微米、振实密度4.5~6g/m3的球状银粉。银粉制作的正银浆料浆料,更易形成良好的印刷细栅高宽比。
根据本发明的另一个实施例,进一步包括,所述的聚硅氧烷可以是直链的或有支链,氢基被氨基、乙基、苯基、氯苯基、三氟丙基、硝基、羟基等替代的聚硅氧烷,聚硅氧烷,优选聚二甲基硅氧烷、聚二乙基硅氧烷、聚甲基苯基硅氧烷、聚甲基含氢硅氧烷、苯基硅氧烷、乙基含氢硅氧烷、甲基乙烯基硅氧烷、甲基乙氧基硅氧烷、羟基硅氧烷中的一种或几种,优选为0.1~6%。
根据本发明的另一个实施例,进一步包括,所述有机载体为一种或几种有机树脂与不同挥发速度的有机溶剂组成;
有机树脂占有机载体的质量百分比的2%~50%,有机树脂选自松香、乙基纤维素、环氧树脂、醋酸纤维素、丙烯酸树脂、聚乙烯树脂中的一种或几种;
有机溶剂占有机载体质量百分比50~98%,有机溶剂选自丁基卡必醇、丁基卡必醇醋酸酯、松油醇、DBE、乙二醇丁醚、乙二醇苯醚、丙二醇丁醚、醇酯中的一种或几种。
根据本发明的另一个实施例,进一步包括,所述助剂包括分散剂或润湿剂至少一种。
一种晶体硅太阳能电池用正银浆料的制备方法,制备方法如下:
步骤1) :制备有机载体:按配方比例称取质量分数2%~50%有机树脂,称取质量分数50%~98%的有机溶剂,在75~85℃温度下溶解1~3小时,得到均一的有机载体;
步骤2) :按配方比例称取平均粒径0.5~3微米、振实密度4.5~6g/m3的球状银粉质量百分比为1~90%、有机载体重量百分比的5~15%,玻璃粉质量百分比1-8%,聚硅氧烷0.1~6%,助剂质量百分比0~3%,在行星式搅拌机或其它搅拌机里混合均匀,再在三辊机上分散至10μm 以下,即可制成晶体硅太阳能电池正银浆料。
根据本发明的另一个实施例,进一步包括,所述制成的晶体硅太阳能电池正银浆料的最大细度≤ 7微米、平均细度≤ 5微米;固体含量为85~95% ;粘度为150~400kcps;烧结温度为760~850℃。
本发明的有益效果是,本发明可以提高银浆印刷的高宽比,降低银浆在烧结过程中产生的拓宽现象,提高浆料的栅线高宽比。
具体实施方式
下面结合实施例对本发明做进一步的说明。
实施例1
本实施例正银导电浆料的组成及其重量百分比:银粉70%、玻璃粉8%、有机载体5%、聚二甲基硅氧烷1%、BYK110 0.2%,其余为溶剂。其中银粉的粒径为粒径0.5~3微米、振实密度4.5~6g/m3的球状银粉;玻璃粉为PbO-TeO2系列玻璃粉,粒径为0.5~3微米。
制备有机载体:松香2%、乙基纤维素1%、环氧树脂5%,丁基卡必醇50%、丁基卡必醇醋酸酯40%,在80℃温度下溶解2小时,得到均一的有机载体;
按上述配方比例称取银粉70%、玻璃粉8%、有机载体5%、聚二甲基硅氧烷1%、BYK1100.2%,其它为溶剂,在行星式搅拌机或其它搅拌机里混合均匀,再在三辊机上分散至10μm以下,即可制成晶体硅太阳能电池正银浆料。晶体硅太阳能电池正银浆料经过400目网筛过滤,即可得到非常均匀的太阳能电池正面银浆。
该浆料的粘度为250Pa.s(25℃),具有非常好的抑制烧结拓宽现象,测试的多晶硅片数为100片,随机抽取两片测试栅线形貌,每片测试3个点,印刷后栅线平均宽度为50微米,烧结后栅线平均宽度为53微米,光电转化效率17.6%左右,对比产线的栅线印刷后平均宽度为52微米,烧结后栅线平均宽度为58微米,光电转化效率17.4%左右。
实施例2
本实施例正银导电浆料的组成及其重量百分比:银粉85%、玻璃粉5%、有机载体8%、聚氨基硅氧烷1.2%、BYK110 0.2%。其中银粉的粒径为粒径0.5~3微米、振实密度4.5~6g/m3的球状银粉;玻璃粉为PbO-TeO2系列玻璃粉,粒径为0.5~3微米。
制备有机载体:乙基纤维素3%、环氧树脂2%、醋酸纤维素3%、松油醇50%、DBE40%在80℃温度下溶解2小时,得到均一的有机载体;
按配方比例称取银粉85%、玻璃粉5%、有机载体8%、聚氨基硅氧烷1%、BYK110 0.5%,其它为溶剂,在行星式搅拌机或其它搅拌机里混合均匀,再在三辊机上分散至10μm 以下,即可制成晶体硅太阳能电池正银浆料。浆料经过400目网筛过滤,即可得到非常均匀的太阳能电池正面银浆。
该浆料的粘度为220Pa.s(25℃),具有非常好的抑制烧结拓宽现象,测试的多晶硅片数为100片,随机抽取两片测试栅线形貌,每片测试3个点,印刷后栅线平均宽度为48微米,烧结后栅线平均宽度为52微米,光电转化效率17.7%左右,对比产线的栅线印刷后平均宽度为52微米,烧结后栅线平均宽度为58微米,光电转化效率17.4%左右。
实施例3
本实施例正银导电浆料的组成及其重量百分比:银粉82%、玻璃粉2.5%、有机载体10%、聚羟基硅氧烷2%、BYK110 0.3%。其中银粉的粒径为粒径0.5~3微米、振实密度4.5~6g/m3的球状银粉;玻璃粉为PbO-TeO2系列玻璃粉,粒径为0.5~3微米。
制备有机载体:丙烯酸树脂3%、聚乙烯树脂5%、聚乙烯树脂3%、丙二醇丁醚50%、松油醇40%在80℃温度下溶解2小时,得到均一的有机载体;
按配方比例称取银粉82%、玻璃粉2.5%、有机载体10%、聚羟基硅氧烷2%、BYK110 0.3%,其它为溶剂,在行星式搅拌机或其它搅拌机里混合均匀,再在三辊机上分散至10μm 以下,即可制成晶体硅太阳能电池正银浆料。浆料经过400目网筛过滤,即可得到非常均匀的太阳能电池正面银浆。
该浆料的粘度为280Pa.s(25℃),具有非常好的抑制烧结拓宽现象,测试的多晶硅片数为100片,随机抽取两片测试栅线形貌,每片测试3个点,印刷后栅线平均宽度为48微米,烧结后栅线平均宽度为51微米,光电转化效率17.6%左右,对比产线的栅线印刷后平均宽度为52微米,烧结后栅线平均宽度为58微米,光电转化效率17.4%左右。
综上,本发明可以提高银浆印刷的高宽比,降低银浆在烧结过程中产生的拓宽现象,提高浆料的栅线高宽比。
Claims (8)
1.一种晶体硅太阳能电池用正银浆料,其特征是,其组分如下:
1~90% 银粉,
0.1~6% 聚硅氧烷,
5~15% 有机载体,
1~8% 玻璃粉;
0~3% 助剂。
2.根据权利要求1所述的一种晶体硅太阳能电池用正银浆料,其特征是,所述银粉为导电材料,平均粒径0.5~3微米、振实密度4.5~6g/m3的球状银粉。
3.根据权利要求1 所述的晶体硅太阳能电池电极浆料用有机载体,其特征在于,所述有机载体中的有机树脂制作的正银浆料稳定性更好,能保证印刷的流畅性。
4.根据权利要求1所述的一种晶体硅太阳能电池用正银浆料,其特征是,所述聚硅氧烷可以是直链的或有支链,氢基被氨基、乙基、苯基、氯苯基、三氟丙基、硝基、羟基等替代的聚硅氧烷,聚硅氧烷,优选聚二甲基硅氧烷、聚二乙基硅氧烷、聚甲基苯基硅氧烷、聚甲基含氢硅氧烷、苯基硅氧烷、乙基含氢硅氧烷、甲基乙烯基硅氧烷、甲基乙氧基硅氧烷、羟基硅氧烷中的一种或几种,优选为0.1~6%。
5.根据权利要求1所述的一种晶体硅太阳能电池用正银浆料,其特征是,所述有机载体为一种或几种有机树脂与不同挥发速度的有机溶剂组成;
有机树脂占有机载体的质量百分比的2%~50%,有机树脂选自松香、乙基纤维素、环氧树脂、醋酸纤维素、丙烯酸树脂、聚乙烯树脂中的一种或几种;
有机溶剂占有机载体质量百分比50~98%,有机溶剂选自丁基卡必醇、丁基卡必醇醋酸酯、松油醇、DBE、乙二醇丁醚、乙二醇苯醚、丙二醇丁醚、醇酯中的一种或几种。
6.根据权利要求1所述的一种晶体硅太阳能电池用正银浆料,其特征是,所述助剂包括分散剂或润湿剂至少一种。
7.一种根据权利要求1~5任一项所述的晶体硅太阳能电池用正银浆料的制备方法,其特征是,制备方法如下:
步骤1) :制备有机载体:按配方比例称取质量分数2%~50%有机树脂,称取质量分数50%~98%的有机溶剂,在75~85℃温度下溶解1~3小时,得到均一的有机载体;
步骤2) :按配方比例称取平均粒径0.5~3微米、振实密度4.5~6g/m3的球状银粉质量百分比为1~90%、有机载体重量百分比的5~15%,玻璃粉质量百分比1-8%,聚硅氧烷0.1~6%,助剂质量百分比0~3%,在行星式搅拌机或其它搅拌机里混合均匀,再在三辊机上分散至10μm 以下,即可制成晶体硅太阳能电池正银浆料。
8.根据权利要求7所述的制备方法,其特征是,所述制成的晶体硅太阳能电池正银浆料的最大细度≤ 7微米、平均细度≤ 5微米;固体含量为85~95% ;粘度为150~400kcps ;烧结温度为760~850℃。
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