CN113593749A - 一种perc晶硅太阳能电池主栅浆料及其制备方法 - Google Patents
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Abstract
本发明公开一种PERC晶硅太阳能电池主栅浆料及其制备方法,包括以下组分,玻璃粉1~5质量份;银粉70~90质量份;乙基纤维素0.5~3质量份;丁基卡必醇0.5~5质量份;十二醇酯0.2~5质量份;丁基卡必醇醋酸酯1~5质量份;有机助剂为余量。本发明操作简单、易于实施,制备的主栅电极银浆烧结的银电极能改善电极导电网络的致密性,并降低对氮化硅的损伤,提高电池填充因子,进而提高PERC电池综合性能。本发明操作简单、易于实施,制备的主栅电极银浆烧结的银电极能改善电极导电网络的致密性,并降低对氮化硅的损伤,提高电池填充因子,进而提高PERC电池综合性能。
Description
技术领域
本发明涉及太阳能电池领域,具体是指一种PERC晶硅太阳能电池主栅浆料及其制备方法。
背景技术
PERC(Passivated Emitter and Rear Cell),即钝化发射极和背面电池技术,最早在1983年由澳大利亚科学家Martin Green提出,目前正在成为太阳电池新一代的常规技术。PERC技术通过在电池的背面上添加钝化层来提高转换效率,PERC电池结构如图1所示。一般而言,正面主栅浆料印刷到电池正面作为串焊电极收集载流子,要求浆料同SiNx反应弱、对电池结构损伤少,烧结完成后电极同Si非接触,同时也具有较宽的焊接窗口。
为最大程度发挥钝化带来的电池效率增益,PERC电池制作烧温低(760℃),且均会匹配LDSE(浅结选择性发射极)扩散技术。而常规主栅银浆使用于高烧温(≥770℃)背景,且电池结区相对PERC+高方阻浅结电池深,主栅浆料烧结过程中空间电荷复合风险低、拉力也相对高。为适应LDSE匹配的PERC电池,对正面主栅银浆提出新的要求,其一,主栅银浆在烧结过程中需保护钝化层不被破坏,减少空间电荷复合;其二,为保证组件长时间工作的稳定性,主栅银浆低烧温条件下形成的电极需具有较好的焊接性能。
另外,当前电池片印刷机产能高、印刷速度快,对主栅印刷性要求高;同时,主栅印刷在副栅印刷之前,对电极烘干强度也有更高的要求。
发明内容
为解决现有技术存在的问题和不足,本发明的目的是提供一种PERC晶硅太阳能电池主栅浆料及其制备方法。通过控制浆料内部组分配比,减少浆料内部轻质杂质元素,实现浆料烧结过程中玻璃组分同电池表面的ARC氮化硅层反应弱,减少杂质元素扩散进入空间电荷区,进而降低空间复合电流、提高电性能。通常,主栅浆料会含有大量的腐蚀性元素Pb/Bi,控制该类元素的含量以及引入其他种类元素,在获得同SiNx润湿条件好的前提下,使得浆料具有空间电荷复合低、低温烧结条件下高可靠性的特点,适用于浅结高方阻高效单晶PERC电池。
作为本发明的第一个方面,本发明的技术方案是一种PERC晶硅太阳能电池主栅浆料,包括以下质量份组分:
进一步设置是所述的主栅浆料的细度小于10um,粘度满足在5RPM、25℃条件下为50.00~180.00Pa·S。
进一步设置是所述玻璃粉平均粒径为0.2~3.5um,由ZnO、MgO、BaO、Li2O、TeO2、Al2O3、La2O3、WO2、MnO2、PbO、TiO2、Bi2O3、CuO、Na2O、SiO2、Al2O3、Na2O、B2O3、La2O中的至少七种组成。
进一步设置是所述银粉振实密度为2.0~5.5g/cm3,粒径为0.2μm~5μm。
进一步设置是所述有机助剂包含偶联剂、触变剂和分散剂。
作为本发明的第二个方面,本发明还提供一种PERC晶硅太阳能电池主栅浆料的制备方法,包括以下步骤:
步骤一:将乙基纤维素、丁基卡必醇、十二醇酯、有机助剂80℃水浴条件下高速搅拌1.5~3h,混合均匀获得载体;
步骤二:将银粉加于步骤一制备的载体中混合均匀、轧制过滤,即得到主栅正银浆料。
本发明的创新机理和有益效果是:
常规主栅浆料适用的烧结温度高,具有较高的Pb或Bi含量,同时,为提高拉力以及高烧温的烧结条件,Li含量也会相对高。但PERC电池整体烧结温度相对低,低烧温条件下要获得较好的拉力配方必须要保持有一定的Pb或Bi含量,同是为了控制空间电荷区复合,电池轻质元素比如Li元素需尽量少。
本发明通过控制严格的Si/Pb、Bi比例,引入Al、Ti、Te、Ce、La、W、Cu、Mn等元素,控制了传统主栅伤害元素Pb、Bi、Li含量,减弱了Pb与SiNx反应、Bi与SiNx反应,同是引入了Zn/Cu/Mn等元素,玻璃整体助烧能力仍旧较强,低烧温下仍然可以获得较好的拉力。当然,因为轻质活性原子Li/Na含量有显著的降低,空间电荷复合减少,开压以及填充因子显著提高,光电转换效率也得到提升。
综上所述,本发明操作简单、易于实施,制备的主栅电极银浆烧结的银电极能改善电极导电网络的致密性,并降低对氮化硅的损伤,提高电池填充因子,进而提高PERC电池综合性能。
附图说明
图1PERC电池结构图
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面将结合实施例对本发明作进一步地详细描述。
实施例1:一种高可靠性PERC晶硅太阳能电池主栅导电浆料,所述主栅导电浆料组成质量比如表一:
所述玻璃粉组成分别为:
玻璃粉一摩尔分数组成为0.1~0.3份PbO、0.01~0.1份Li2O、0.01~0.1份Al2O3、0.01~0.2份ZnO、0.05~0.3份TiO2、0.35~0.55份SiO2、0~0.2份TeO2、0~0.1份CeO2、0~0.1份La2O、0.05~0.2份MnO2、0.01~0.3份CuO;
银粉导电相平均粒径在0.2~3um之间,振实密度2.0~5.0g/cm3;
上述PERC晶硅太阳能电池主栅电极导电银浆生产工艺如下:
步骤一,乙基纤维素、丁基卡必醇、十二醇酯、有机助剂80℃水浴条件下高速搅拌1.5~3h,混合均匀获得载体;
步骤二,将玻璃体系加于步骤一中的均质载体,混合均匀;
步骤三,银粉体系加于步骤二体系混合均匀、轧制五遍,过滤,即得到主栅导电银浆;
步骤四,使用发明的PERC主栅导电银浆丝网印刷到单晶PERC片正面制备主栅电极,背电极、背电场、细栅使用当前最佳银浆组合,760℃共烧后,即是单晶PERC电池成品。
实施例一测试电性能如表二:
表二
PASTE | Uoc | Isc | Rs | Rsh | FF | Eff | 拉力/N |
ref | 0.677 | 9.880 | 0.00123 | 28.85 | 80.32 | 0.2208 | 1.5 |
实施例一 | 0.678 | 9.872 | 0.00138 | 111.18 | 80.36 | 0.2211 | 2.0 |
实施例2:一种高可靠性PERC晶硅太阳能电池主栅导电浆料,所述主栅导电浆料组成质量比如表三:
表三
实施例二 | |
玻璃粉 | 1.60% |
银粉 | 86.40% |
丁基卡必醇 | 2.90% |
十二醇酯 | 2.70% |
丁基卡必醇醋酸酯 | 2.50% |
乙基纤维素 | 1.50% |
有机助剂 | 2.40% |
所述玻璃粉组成分别为:
玻璃粉二摩尔分数组成为0.1~0.3份PbO、0.01~0.1份Bi2O3、0.1~0.3份Al2O3、0.05~0.3份TiO2、0.01~0.2份ZnO、0.35~0.55份SiO2、0~0.1份WO2、0~0.2份TeO2、0~0.1份CeO2、0~0.1份La2O0.05~0.2份MnO2、0.01~0.3份CuO;银粉导电相平均粒径在0.2~3um之间,振实密度2.0~5.0g/cm3;
上述PERC晶硅太阳能电池主栅电极导电银浆生产工艺如下:
步骤一,乙基纤维素、丁基卡必醇、十二醇酯、有机助剂80℃水浴条件下高速搅拌1.5~3h,混合均匀获得载体;
步骤二,将玻璃体系加于步骤一中的均质载体,混合均匀;
步骤三,银粉体系加于步骤二体系混合均匀、轧制五遍,过滤,即得到主栅导电银浆;
步骤四,使用发明的PERC主栅导电银浆丝网印刷到单晶PERC片正面制备主栅电极,背电极、背电场、细栅使用当前最佳银浆组合,760℃共烧后,即是单晶PERC电池成品。
实施例二测试电性能如表四:
表四
PASTE | Uoc | Isc | Rs | Rsh | FF | Eff | 拉力/N |
ref | 0.677 | 9.926 | 0.00126 | 37.83 | 79.96 | 0.2210 | 1.6 |
实施例二 | 0.676 | 9.924 | 0.00127 | 41.91 | 79.95 | 0.2208 | 2.1 |
表二、表四说明,两个实施例电池的Eff都比比较例高。这说明新开发玻璃体系有利于获得较佳的电性能,并且获得了高的焊接拉力。
以上所揭露的仅为本发明较佳实施例而已,当然不能以此来限定本发明之权利范围,因此依本发明权利要求所作的等同变化,仍属本发明所涵盖的范围。
Claims (6)
2.根据权利要求1所述的一种PERC晶硅太阳能电池主栅浆料,其特征在于:所述的主栅浆料的细度小于10um,粘度满足在5RPM、25℃条件下为50.00~180.00Pa·S。
3.根据权利要求1所述的一种PERC晶硅太阳能电池主栅浆料,其特征在于:所述玻璃粉平均粒径为0.2~3.5um,由ZnO、MgO、BaO、Li2O、TeO2、Al2O3、La2O3、WO2、MnO2、PbO、TiO2、Bi2O3、CuO、Na2O、SiO2、Al2O3、Na2O、B2O3、La2O中的至少七种组成。
4.根据权利要求1所述的一种PERC晶硅太阳能电池主栅浆料,其特征在于:所述银粉振实密度为2.0~5.5g/cm3,粒径为0.2μm~5μm。
5.根据权利要求1所述的一种PERC晶硅太阳能电池主栅浆料,其特征在于:所述有机助剂包含偶联剂、触变剂和分散剂。
6.一种PERC晶硅太阳能电池主栅浆料的制备方法,其特征在于按照权利要求1所述的组分比例称取组分,然后通过以下步骤制备:
步骤一:将乙基纤维素、丁基卡必醇、十二醇酯、有机助剂80℃水浴条件下高速搅拌1.5~3h,混合均匀获得载体;
步骤二:将银粉加于步骤一制备的载体中混合均匀、轧制过滤,即得到主栅正银浆料。
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