CN113224210A - 一种p型ibc电池的制备方法 - Google Patents
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Abstract
本发明公开一种P型IBC电池的制备方法,与Topcon高效工艺叠加,效率较高;利用P型单晶硅衬底作为P区,正背面均无需B掺杂,且无需掩膜和光刻,工艺步骤简单,将传统IBC电池复杂的工艺步骤降低到12步,生产成本降低非常明显,有利于IBC电池的商业化推广。
Description
技术领域
本发明涉及一种P型IBC电池制备方法,属于太阳能电池生产技术领域。
背景技术
随着光伏行业的发展,降本提效的需求日益迫切,其中提升太阳能电池的光电转换效率是降本提效最主要的途径之一。当前的高效电池结构主要包括Topcon、HIT以及IBC电池等,以上电池结构均以N型晶硅为基底,其中IBC电池结构与其它高效电池结构具有很好的兼容性。
IBC电池由于具备以下优点而逐渐受到青睐:(1)正面无遮光,短路电流Isc提升明显;(2)正面无金属接触复合,有利于提升开路电压Voc;(3)与其它高效工艺具有很好的兼容性;(4)组件可以实现二维封装,降低片间距,有利于提升组件单位面积的发电功率,且外观优美;(5)可以实现薄片化,降低硅片成本。但是传统的IBC电池具有20步以上的工艺步骤,工艺复杂,成本高昂,不利于商业化生产。
因此简化IBC电池的工艺流程,降低商业化生产成本,对于本技术领域的研发人员来说具有非常重要的意义。
发明内容
解决上述技术问题,本发明提出了一种P型IBC电池工艺制备方法,将传统IBC电池复杂的工艺步骤降低到12步,生产成本降低非常明显,有利于IBC电池的商业化推广。
本申请提供一种P型IBC电池的制备方法,所述工艺制备方法包括如下工艺步骤:
S01硅片清洗抛光:对P型单晶硅基底进行化学清洗和碱抛光,去除硅基底表面的机械损伤层和污染物,且使硅基底正背表面形貌较为平坦;
S02双面沉积氧化硅和非晶硅膜层:抛光后的基底正背面沉积氧化硅层和非晶硅层;
S03背面P扩散、退火:对背面非晶硅层进行磷掺杂处理,后高温退火处理,非晶硅转化为多晶硅;
S04背面激光刻蚀:利用纳秒级或皮秒激光对背面进行图案化处理;
S05去除正侧面PSG:在S02和S03过程中,同时会在基底正面以及侧面形成磷硅玻璃层,即PSG,采用HF酸去除;
S06碱制绒:利用KOH溶液使基底正面和背面局部区域构造为金字塔绒面结构;
S07双面沉积AlOx膜层:以ALD原子层沉积方式在基底正背面沉积一层致密的氧化铝薄膜;
S08背面沉积减反射膜层:以PECVD的方式在基底背面沉积氮化硅、氮氧化硅中的一种或多种叠层膜;
S09正面沉积减反射膜层:以PECVD的方式在基底正面沉积氮化硅、氮氧化硅中的一种或多种叠层膜;
S10背面激光开膜:利用纳秒级或皮秒级激光对背面减反射层和钝化膜叠层进行开膜处理;
S11丝网印刷正负电极:N区印刷负电极Ag浆,P区印刷正电极Al浆;
S12烧结:正电极Al浆和负电极Ag浆共烧结,形成良好的欧姆接触。
进一步的,在步骤S02中,沉积氧化硅层的厚度为1-2nm,非晶硅层的厚度为80-250nm;
进一步的,在步骤S03中,高温退火处理后的多晶硅方阻为20-60ohm/sq;
更进一步的,在步骤S07中,氧化铝膜层的厚度为3-8nm。
与传统IBC电池相比,本发明提出的P型IBC电池结构以及工艺制备方法,具备如下有益效果:
1、与Topcon高效工艺叠加,效率较高;
2、利用P型单晶硅衬底作为P区,正背面均无需B掺杂,且无需掩膜和光刻,工艺步骤简单;
3、P区正电极采用Al浆,Ag浆使用量降低50%,且采用P型单晶硅作为基底,明显降低了生产成本。
附图说明
为了更清楚地说明本发明中的技术方案,下面将对本发明中所需要使用的附图进行简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,可以根据这些附图获得其它附图。
图1:本发明提供的P型IBC电池结构示意图;
图2:本发明提供的P型IBC电池工艺流程图;
其中1为P型单晶硅基底,2为氧化硅层,3为B掺杂的多晶硅层,4为正面减反射和钝化膜叠层,5为正电极铝栅线,6为负电极银栅线,7为背面减反射和钝化膜叠层。
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,下面将结合附图对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域的技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例一:
本发明提供了一种P型IBC电池结构,如图1所示,依次包括正面减反射和钝化膜叠层4、P型单晶硅为基底1、背面N型扩散层、背面减反射和钝化膜叠层7以及设置于背面钝化层之上的正负金属电极。
所述P型单晶硅基底包括正面和背面,所述正面构造为金字塔绒面结构;所述背面构造呈金字塔绒面结构和抛光面间隔排列;
所述正面减反射和钝化膜叠层4为氧化铝、氮化硅、氮氧化硅中的一种或多种;
所述背面N型扩散层包括氧化硅层2以及掺杂P元素的多晶硅层3,且叠层贴合设置于单晶硅基底背面抛光区域;
所述背面减反射和钝化膜叠层7为氧化铝、氮化硅、氮氧化硅中的一种或多种;
所述背面金属电极包括正电极Al栅线5以及负电极Ag栅线6,所述正电极Al栅线5置于背面绒面区域,所述负电极Ag栅线6置于背面抛光区域。
实施例二:
另一方面,本发明提供一种P型IBC电池的工艺制备方法,所述工艺制备方法包括如下工艺步骤:
S01硅片清洗抛光:对P型单晶硅基底进行化学清洗和碱抛光,去除硅基底表面机械损伤层以及污染物,且使基底正背表面形貌较为平坦;
S02双面沉积氧化硅和非晶硅膜层:抛光后的基底正背面沉积氧化硅层和非晶硅层;
S03背面P扩散+退火:对背面非晶硅层进行P掺杂处理,后高温退火处理,非晶硅转化为多晶硅膜层;
S04背面激光刻蚀:利用532nm波长的纳秒或皮秒激光对背面进行图案化处理;
S05去除正侧面PSG:在S02和S03过程中,同时会在基底正面以及侧面形成磷硅玻璃层,即PSG,此步采用HF氢氟酸酸去除;
S06碱制绒:利用KOH氢氧化钾或NaOH氢氧化钠碱溶液使基底正面和背面局部区域构造为金字塔绒面结构;
S07双面沉积AlOx氧化铝膜层:以ALD原子层沉积方式在基底正背面沉积一层致密的氧化铝薄膜;
S08背面沉积减反射膜层:以PECVD的方式在基底背面沉积氮化硅、氮氧化硅中的一种或多种叠层膜;
S09正面沉积减反射膜层:以PECVD的方式在基底正面沉积氮化硅、氮氧化硅中的一种或多种叠层膜;
S10背面激光开膜:利用532nm波长的纳秒或皮秒激光对背面减反射层和钝化膜叠层进行开膜处理;
S11丝网印刷正负电极:N区印刷负电极Ag浆,P区印刷正电极Al浆;
S12烧结:正电极Al铝浆和负电极Ag银浆共烧结,形成良好的欧姆接触;
进一步地:在步骤S02中,沉积氧化硅层的厚度为1-2nm,非晶硅层的厚度为80-250nm;
进一步地:在步骤S03中,高温退火处理后的多晶硅方阻为20-60ohm/sq;
进一步地:在步骤S07中,氧化铝膜层的厚度为3-8nm。
本申请提供一种工艺简单且成本较低的P型IBC电池,可通过采用上述工艺方法进行实现。
需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。另外,本申请实施例提供的上述技术方案中与现有技术中对应技术方案实现原理一致的部分并未详细说明,以免过多赘述。
对所公开的实施例的上述说明,使本领域技术人员能够实现或使用本申请。对这些实施例的多种修改对本领域技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本申请的精神或范围的情况下,在其它实施例中实现。因此,本申请将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。
Claims (2)
1.一种P型IBC电池的制备方法,其特征在于,所述工艺制备方法包括如下工艺步骤:
S01硅片清洗抛光:对P型单晶硅基底进行化学清洗和碱抛光,去除硅基底表面的机械损伤层和污染物,且使硅基底正背表面形貌较为平坦;
S02双面沉积氧化硅和非晶硅膜层:抛光后的基底正背面沉积氧化硅层和非晶硅层;
S03背面P扩散、退火:对背面非晶硅层进行磷掺杂处理,后高温退火处理,非晶硅转化为多晶硅;
S04背面激光刻蚀:利用纳秒级或皮秒激光对背面进行图案化处理;
S05去除正侧面PSG:在S02和S03过程中,同时会在基底正面以及侧面形成磷硅玻璃层,即PSG,采用HF酸去除;
S06碱制绒:利用KOH溶液使基底正面和背面局部区域构造为金字塔绒面结构;
S07双面沉积AlOx膜层:以ALD原子层沉积方式在基底正背面沉积一层致密的氧化铝薄膜;
S08背面沉积减反射膜层:以PECVD的方式在基底背面沉积氮化硅、氮氧化硅中的一种或多种叠层膜;
S09正面沉积减反射膜层:以PECVD的方式在基底正面沉积氮化硅、氮氧化硅中的一种或多种叠层膜;
S10背面激光开膜:利用纳秒级或皮秒级激光对背面减反射层和钝化膜叠层进行开膜处理;
S11丝网印刷正负电极:N区印刷负电极Ag浆,P区印刷正电极Al浆;
S12烧结:正电极Al浆和负电极Ag浆共烧结,形成良好的欧姆接触。
2.根据权利要求7所述的一种P型IBC电池的制备方法,其特征在于,在步骤S02中,沉积氧化硅层的厚度为1-2nm,非晶硅层的厚度为80-250nm;
根据权利要求7所述的一种P型IBC电池的制备方法,其特征在于,在步骤S03中,高温退火处理后的多晶硅方阻为20-60ohm/sq;
根据权利要求7所述的一种P型IBC电池的制备方法,其特征在于,在步骤S07中,氧化铝膜层的厚度为3-8nm。
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