CN113725308A - 一种可靠度高的光伏电池 - Google Patents
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Abstract
本发明公开了一种可靠度高的光伏电池，包括衬底，所述衬底采用单晶硅片，且在所述单晶硅片的两侧均有切割痕，两侧的切割痕方向相同，在所述单晶硅片的一侧包含发射极，所述发射级包含钝化区，在所述钝化区上设置金属电极，且所述金属电极与切割痕交叉设置，所述单晶硅片的另一侧设置接触钝化层，且所述接触钝化层为复合叠层。通过在单晶硅片的发射极的一侧设置金属电极，而且金属电极与切割痕交叉设置，可以增强光伏电池的机械强度，继而提高电池的可靠度，从而极大的提高电池的使用寿命，最终降低光伏电池的发电成本。
Description
技术领域
本发明涉及太阳能电池制备领域，尤其涉及一种可靠度高的光伏电池。
背景技术
随着太阳能电池行业的不断发展，内业竞争也在不断加剧，大型太阳能电 池企业间并购整合与资本运作日趋频繁，优秀的太阳能电池生产企业愈来愈重 视对行业市场的研究，特别是对产业发展环境和产品购买者的深入研究。太阳 光照在半导体p-n结上，形成新的空穴-电子对，在p-n结内建电场的作用下， 光生空穴流向p区，光生电子流向n区，接通电路后就产生电流。这就是光电 效应太阳能电池的工作原理。
但是，现有的光伏电池的表面会存在切割痕，这些切割痕会对光伏电池的 强度造成影响，如果不进行处理，则影响光伏电池的使用寿命和增加光伏电池 的发电成本。
因此本发明的发明人，针对上述技术问题，旨在发明一种可靠度高的光伏 电池。
发明内容
为克服上述缺点，本发明的目的在于提供一种可靠度高的光伏电池。
为了达到以上目的，本发明采用的技术方案是：一种可靠度高的光伏电池， 包括衬底，所述衬底采用单晶硅片，且在所述单晶硅片的两侧均有切割痕，两 侧的切割痕方向相同，在所述单晶硅片的一侧包含发射极，所述发射级包含钝 化区，在所述钝化区上设置金属电极，且所述金属电极与切割痕交叉设置，所 述单晶硅片的另一侧设置接触钝化层，且所述接触钝化层为复合叠层。
优选地，所述金属电极与切割痕垂直设置。
优选地，所述切割痕平行设置多个，同时所述金属电极也平行设置多个。 即切割痕和金属电极均设置多个，其中，切割痕是由于单晶硅片切割时造成的， 而金属电极的设置，才是主动设置的，为了提高光伏电池的可靠性。
优选地，所述金属电极的宽度介于5-30微米，其高度介于5-20微米，且 金属电极的数量n满足以下公式：
其中，x为单晶硅片的边长且此边与切割痕方向平行，且其长度单位为mm。
优选地，所述单晶硅片为矩形或具有倒角的准矩形，其相邻的两边的边长 分别为x和y，且二者长度不相同。
优选地，所述金属电极的材质为金、银、铜、铝、镍、锡及其化合物中的 至少一种。即金属电极可以为单金属电极或其化合物电极，也可以为多个叠层 复合的电极。
优选地，所述接触钝化层为氧化硅层、掺杂多晶硅层、氮化硅层的叠层， 且所述氧化硅层与单晶硅片的另一侧接触。
优选地，所述接触钝化层为本征非晶硅层、掺杂非晶硅层和透明导电膜层 的叠层，且所述本征非晶硅层与单晶硅片的另一侧接触。
本发明一种可靠度高的光伏电池的有益效果是，通过在单晶硅片的发射极 的一侧设置金属电极，而且金属电极与切割痕交叉设置，可以增强光伏电池的 机械强度，继而提高电池的可靠度，从而极大的提高电池的使用寿命，最终降 低光伏电池的发电成本。
附图说明
图1为光伏电池的表面示意图。
图2为光伏电池的纵剖面示意图。
图中：
1、衬底，2、切割痕，3、钝化区，4、金属电极，5、接触钝化层。
具体实施方式
下面结合附图对本发明的较佳实施例进行详细阐述，以使本发明的优点和 特征能更易于被本领域技术人员理解，从而对本发明的保护范围做出更为清楚 明确的界定。
参见附图1-2所示，本实施例中的一种可靠度高的光伏电池，包括衬底1， 衬底1采用单晶硅片，且在单晶硅片的两侧均有切割痕2，两侧的切割痕2方向 相同，在单晶硅片的一侧包含发射极，发射级包含钝化区3，在钝化区3上设置 金属电极4，且金属电极4与切割痕2交叉设置，单晶硅片的另一侧设置接触钝 化层5，且接触钝化层5为复合叠层。
金属电极4与切割痕2垂直设置。
切割痕2平行设置多个，同时金属电极4也平行设置多个。即切割痕2和 金属电极4均设置多个，其中，切割痕2是由于单晶硅片切割时造成的，而金 属电极4的设置，才是主动设置的，为了提高光伏电池的可靠性。
金属电极4的宽度介于5-30微米，其高度介于5-20微米，且金属电极4 的数量n满足以下公式：
x/2.5≤n≤x/0.5
其中，x为单晶硅片的边长且此边与切割痕2方向平行，且其长度单位为 mm。
单晶硅片为矩形或具有倒角的准矩形，其相邻的两边的边长分别为x和y， 且二者长度不相同。
金属电极4的材质为金、银、铜、铝、镍、锡及其化合物中的至少一种。 即金属电极4可以为单金属电极4或其化合物电极，也可以为多个叠层复合的 电极。
接触钝化层5为氧化硅层、掺杂多晶硅层、氮化硅层的叠层，且氧化硅层 与单晶硅片的另一侧接触。
接触钝化层5为本征非晶硅层、掺杂非晶硅层和透明导电膜层的叠层，且 本征非晶硅层与单晶硅片的另一侧接触。
单晶硅片的表面为金字塔状，可以减少光的反射，增加对光的吸收，但是 这种厚度不匀的设置，会降低光伏电池的可靠度，因此增加金属电极，且金属 电极与切割痕垂直设置，增加其机械强度。
一种可靠度高的光伏电池的有益效果是，通过在单晶硅片的发射极的一侧 设置金属电极4，而且金属电极4与切割痕2交叉设置，可以增强光伏电池的机 械强度，继而提高电池的可靠度，从而极大的提高电池的使用寿命，最终降低 光伏电池的发电成本。
以上实施方式只为说明本发明的技术构思及特点，其目的在于让熟悉此项 技术的人了解本发明的内容并加以实施，并不能以此限制本发明的保护范围， 凡根据本发明精神实质所做的等效变化或修饰，都应涵盖在本发明的保护范围 内。
Claims (8)
1.一种可靠度高的光伏电池，其特征在于：包括衬底，所述衬底采用单晶硅片，且在所述单晶硅片的两侧均有切割痕，两侧的切割痕方向相同，在所述单晶硅片的一侧包含发射极，所述发射级包含钝化区，在所述钝化区上设置金属电极，且所述金属电极与切割痕交叉设置，所述单晶硅片的另一侧设置接触钝化层，且所述接触钝化层为复合叠层。
2.根据权利要求1所述的一种可靠度高的光伏电池，其特征在于：所述金属电极与切割痕垂直设置。
3.根据权利要求1所述的一种可靠度高的光伏电池，其特征在于：所述切割痕平行设置多个，同时所述金属电极也平行设置多个。
4.根据权利要求1所述的一种可靠度高的光伏电池，其特征在于：所述金属电极的宽度介于5-30微米，其高度介于5-20微米，且金属电极的数量n满足以下公式：
其中，x为单晶硅片的边长且此边与切割痕方向平行，且其长度单位为mm。
5.根据权利要求1所述的一种可靠度高的光伏电池，其特征在于：所述单晶硅片为矩形或具有倒角的准矩形，其相邻的两边的边长分别为x和y，且二者长度不相同。
6.根据权利要求1所述的一种可靠度高的光伏电池，其特征在于：所述金属电极的材质为金、银、铜、铝、镍、锡及其化合物中的至少一种。
7.根据权利要求1所述的一种可靠度高的光伏电池，其特征在于：所述接触钝化层为氧化硅层、掺杂多晶硅层、氮化硅层的叠层，且所述氧化硅层与单晶硅片的另一侧接触。
8.根据权利要求1所述的一种可靠度高的光伏电池，其特征在于：所述接触钝化层为本征非晶硅层、掺杂非晶硅层和透明导电膜层的叠层，且所述本征非晶硅层与单晶硅片的另一侧接触。
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