CN111312860A - 降低N-Topcon晶硅太阳能电池边缘复合的方法 - Google Patents

降低N-Topcon晶硅太阳能电池边缘复合的方法 Download PDF

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CN111312860A
CN111312860A CN202010181829.1A CN202010181829A CN111312860A CN 111312860 A CN111312860 A CN 111312860A CN 202010181829 A CN202010181829 A CN 202010181829A CN 111312860 A CN111312860 A CN 111312860A
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廖光明
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Jiangsu Sunport Power Corp Ltd
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Abstract

本发明公布了一种降低N‑Topcon晶硅太阳能电池边缘复合的方法,所述方法原有N‑topcon工艺基础上,在N‑Topcon电池正面经过B元素掺杂处理后,增加正面激光边缘刻蚀处理;在背面经过P元素掺杂处理后,增加背面激光边缘刻蚀处理,降低了正、背面边缘30~100um区域内载流子的横向传输能力,改善边缘复合电流,降低N‑Topcon晶硅太阳能电池边缘复合的几率,提升光电转换效率。

Description

降低N-Topcon晶硅太阳能电池边缘复合的方法
技术领域
本发明涉及一种降低N-Topcon电池边缘复合的方法,属于晶硅太阳能电池生产技术领域。
背景技术
在晶硅太阳能电池制造工艺中,光学损失、复合损失以及电阻损失是限制晶硅太阳能电池光电转换效率极限的3大损失机制,其中正背表面、基体、边缘、PN结耗尽区以及金属接触区都存在复合损失,对于不同结构的电池,不同区域的复合占比具有一定差异。
N-Topcon电池正、背面分别经过B、P元素掺杂处理,导致正、背表面都具有很强的载流子横向传输能力;且正、背面分别有AlOx/SiNx、 SiO2/Poly-Si钝化处理,表面复合损失非常小。该结构电池正背表面钝化效果均比较好,因此正背表面复合比较小;且正背表面载流子横向传输能力比较强,因此边缘复合比较大。此起彼伏,因此增加了边缘复合占总复合的比例;综合以上两点,边缘区域复合在N-Topcon电池中的复合占比要远大于其它结构电池。
发明内容
为了解决上述背景技术中的问题,本发明的目的是提供一种能够降低N-Topcon晶硅太阳能电池边缘复合的方法,增加了两次激光刻蚀工艺,降低了正、背面边缘30~100um区域内载流子的横向传输能力,改善边缘复合电流,提升了光电转换效率。
本发明降低N-Topcon晶硅太阳能电池边缘复合的方法,所述方法原有N-topcon工艺基础上,在N-Topcon电池正面经过B元素掺杂处理后,增加正面激光边缘刻蚀处理;在背面经过P元素掺杂处理后,增加背面激光边缘刻蚀处理,降低了正、背面边缘30~100um区域内载流子的横向传输能力,改善边缘复合电流,降低N-Topcon晶硅太阳能电池边缘复合的几率,提升光电转换效率。
进一步的,所述方法具体为:
步骤一,在N-Topcon电池正面B元素掺杂后,利用激光脉冲对正面边缘扩散区域刻蚀处理;
步骤二,在背面和侧面BSG(Boro-Silicate Glass,即硼硅玻璃)去除工艺中,对激光刻蚀区域进行抛光处理,改善损伤层以及表面悬挂键;
步骤三,在电池片背面生长SiO2/Poly-Si叠层钝化膜,以及对非晶硅Poly-Si进行P元素掺杂和退火晶化处理后,二次利用脉冲激光对背面的poly-Si边缘刻蚀处理;
步骤四,通过RCA清洗工艺对背面刻蚀区域进行抛光处理。
作为一种优选,所述步骤一中,刻蚀区域宽度在30~100um。
作为一种优选,所述步骤三中,刻蚀区域的宽度在30~100um。
本发明在原有N-Topcon工艺基础上,增加了两次激光刻蚀工艺,降低了正、背面边缘30~100um区域内载流子的横向传输能力,改善边缘复合电流,提升了光电转换效率。
附图说明
图1为N-Topcon电池正面经过B元素扩散后的示意图;
图2为N-Topcon电池背面Poly-Si膜经过P元素扩散示意图。
图中:D-正面B扩散区,W-正面激光刻蚀区,P-背面P扩散区,B-背面激光刻蚀区。
具体实施方式
下面结合附图对本发明进行详细说明:
本发明提供一种降低N-Topcon晶硅太阳能电池边缘复合的方法,所述方法原有N-topcon工艺基础上,在N-Topcon电池正面经过B元素掺杂处理后,增加正面激光边缘刻蚀处理;在背面经过P元素掺杂处理后,增加背面激光边缘刻蚀处理,降低了正、背面边缘30~100um区域内载流子的横向传输能力,改善边缘复合电流,降低N-Topcon晶硅太阳能电池边缘复合的几率,提升光电转换效率。
进一步的,所述方法具体为:
如图1所示,步骤一,在N-Topcon电池正面B元素掺杂后,利用激光脉冲对正面边缘扩散区域刻蚀处理;
步骤二,在背面和侧面BSG(硼硅玻璃)去除工艺中,对激光刻蚀区域进行抛光处理,改善损伤层以及表面悬挂键;
如图2所示,步骤三,在电池片背面生长SiO2/Poly-Si叠层钝化膜,以及对Poly-Si进行P元素掺杂和退火晶化处理后,二次利用脉冲激光对背面的非晶硅Poly-Si边缘刻蚀处理;
步骤四,通过RCA清洗工艺对背面刻蚀区域进行抛光处理。
作为一种优选,所述步骤一中,刻蚀区域宽度在30~100um。
作为一种优选,所述步骤三中,刻蚀区域的宽度在30~100um。
本发明在原有N-topcon工艺基础上,增加了两次激光刻蚀工艺,降低了正、背面边缘30~100um区域内载流子的横向传输能力,改善边缘复合电流,提升了光电转换效率。
上述仅为本申请的较佳实施例,并不用以限制本申请,凡在本申请的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。

Claims (4)

1.降低N-Topcon晶硅太阳能电池边缘复合的方法,其特征在于,所述方法原有N-topcon工艺基础上,在N-Topcon电池正面经过B元素掺杂处理后,增加正面激光边缘刻蚀处理;在背面经过P元素掺杂处理后,增加背面激光边缘刻蚀处理,降低了正、背面边缘30~100um区域内载流子的横向传输能力,改善边缘复合电流,降低N-Topcon晶硅太阳能电池边缘复合的几率,提升光电转换效率。
2.根据权利要求1所述的降低N-Topcon晶硅太阳能电池边缘复合的方法,其特征在于,所述方法具体为:
步骤一,在N-topcon电池正面B掺杂后,利用激光脉冲对正面边缘扩散区域刻蚀处理;
步骤二,在背面和侧面BSG去除工艺中,对激光刻蚀区域进行抛光处理,改善损伤层以及表面悬挂键;
步骤三,在电池片背面生长SiO2/Poly-Si叠层钝化膜,以及对Poly-Si进行P元素掺杂和退火晶化处理后,二次利用脉冲激光对背面的poly-Si边缘刻蚀处理;
步骤四,通过RCA清洗工艺对背面刻蚀区域进行抛光处理。
3.根据权利要求2所述的降低N-Topcon晶硅太阳能电池边缘复合的方法,其特征在于,所述步骤一中,刻蚀区域宽度在30~100um。
4.根据权利要求2所述的降低N-Topcon晶硅太阳能电池边缘复合的方法,其特征在于,所述步骤三中,刻蚀区域的宽度在30~100um。
CN202010181829.1A 2020-03-16 2020-03-16 降低N-Topcon晶硅太阳能电池边缘复合的方法 Pending CN111312860A (zh)

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CN112768564A (zh) * 2021-01-20 2021-05-07 东方日升(常州)新能源有限公司 Topcon电池的光注入钝化方法
WO2023083418A1 (de) * 2021-11-11 2023-05-19 Hanwha Q Cells Gmbh Solarzelle und verfahren zur herstellung einer solarzelle

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CN112768564A (zh) * 2021-01-20 2021-05-07 东方日升(常州)新能源有限公司 Topcon电池的光注入钝化方法
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WO2023083418A1 (de) * 2021-11-11 2023-05-19 Hanwha Q Cells Gmbh Solarzelle und verfahren zur herstellung einer solarzelle

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Application publication date: 20200619