CN109244184B - 一种双面氧化铝结构的perc双面电池及其制备方法 - Google Patents
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Abstract
本发明涉及一种双面氧化铝结构的PERC双面电池及其制备方法,包括硅片,硅片正面依次形成的二氧化硅层、正面氧化铝膜和减反膜;硅片背面依次形成有背面二氧化硅层、背面氧化铝膜、钝化膜和背电极。本发明的制备方法为:清洗、制绒;磷扩散制备pn结;背面抛光、刻蚀、去PSG;退火氧化;双面镀氧化铝膜;正面减反膜沉积;背面钝化膜沉积;激光开槽;丝网印刷、烧结。本发明克服了目前传统方法由于先沉积SiNx再镀氧化铝层所带来的绕镀问题,并能提高电池的转化效率。
Description
技术领域
本发明属于太阳能电池领域,特别是涉及一种双面氧化铝结构的PERC太阳能电池及其制备方法。
背景技术
PERC太阳能电池由于跟常规电池生产线切合度高、投入相对较少,效率增益高,目前各家电池生产线逐渐投入PERC取代常规电池,PERC电池氧化铝镀膜目前主要为两种方式:PECVD和ALD,而ALD由于沉积的氧化铝更致密钝化效果更好以及所用TMA耗量少,且设备国产化之后设备成本相对较低使得各家生产商使用ALD的越来越多。
ALD目前有两种方式:一种方法称之为“空间隔离原子层沉积”(Spatial ALD),其反应物TMA和水使用N2隔绝在一定区域内喷出,硅片在反应区域内来回高速移动,以此在硅片上沉积氧化铝;另一种方法称之为“时间隔离原子层沉积”(Temporal ALD),其固定硅片位置,在腔体里交替引入TMA和水。由于Spatial ALD维护周期相对于Temporal ALD短以及产出相对低,目前使用Temporal ALD的越来越多。
Temporal ALD方法的特点无法做单面镀膜,采用背靠背插片方式时会有绕镀产生影响外观,为了外观均匀性只能采用单插方式双面沉积氧化铝,对于P型硅片来说正面n结上沉积氧化铝会产生寄生漏电流导致电池转换效率偏低。现有技术有在沉积氧化铝之前先沉积正面SiNx来达到隔绝正面氧化铝对n+层的影响,但此处SiNx会在背面一圈有绕镀SiNx会造成背面氧化铝钝化变弱致使电池转换效率偏低。
发明内容
为了解决上述问题,本发明的目的在于提供一种双面氧化铝结构的PERC双面电池及其制备方法,其通过改变工艺流程,克服了目前传统方法由于先沉积SiNx再镀氧化铝层所带来的绕镀问题,并能提高电池的转化效率。
为了实现上述目的,本发明的技术方案为:
一种双面氧化铝结构的PERC双面电池,包括硅片和设于硅片正面的正电极,所述硅片正面依次设有正面二氧化硅层、正面氧化铝膜和减反膜;所述硅片的背面依次形成有背面二氧化硅层、背面氧化铝膜、钝化膜和背电极;所述正面二氧化硅层厚度大于3nm,而背面二氧化硅层厚度小于3nm。
所述双面氧化铝结构的PERC双面电池的制备方法,包括如下步骤:
1)清洗、制绒;
2)磷扩散制备pn结;
3)背面抛光、刻蚀,去PSG;
4)退火氧化,将硅片以背靠背方式插片送入炉管内,在500-750℃温度下进行退火氧化,控制退火氧化时间,使硅片正面生长的二氧化硅层厚度大于3nm,硅片背面生长的二氧化硅层厚度小于3nm;
5)双面镀氧化铝膜,采用Temporal ALD方式,将硅片单插方式在ALD腔室内,真空条件下周期性通入TMA、N2、H2O双面沉积氧化铝膜;
6)正面减反膜沉积;
7)背面钝化膜沉积;
8)激光开槽;
9)丝网印刷、烧结。
作为本发明的进一步改进:所述正面二氧化硅层厚度控制在大于3nm小于5nm,背面二氧化硅层厚度控制在1-2nm,这样可使最大程度上保证背面氧化铝的场效应,同时又能隔绝氧化铝在正面的场效应。
作为本发明的优选实施例,所述退火氧化时间控制在10-20min。
本发明充分利用氧化铝的场钝化效应在2-3nm范围以内有效这一限定原理,在n+层之上使用大于3nm的材料将氧化铝和n+层隔绝开则会降低氧化铝对n+层的影响;因此本发明经充分研究,改变了原有沉积SiNx来隔绝的思路,在背面抛光清洗后引进退火氧化工艺,并采用背靠背正面朝外插片方式,在硅片表面生长一层二氧化硅层将硅片表面悬挂键钝化,由于采用背靠背插片正面要比背面生长快,当正面二氧化硅层大于3nm既可以起到抗PID作用,并且又可以隔绝氧化铝在正面的场效应。而由于背面二氧化硅生长速率慢,故可控制背面二氧化硅厚度小于3nm,使其对背面氧化铝的场效应产生不明显的隔绝效果,从而不影响背面氧化铝钝化。
本发明只需要在原有工艺基础上将沉积正面SiNx工艺步骤改变成退火氧化即可进行生产,简单、方便。本发明克服了目前传统方法由于先沉积SiNx再镀氧化铝层所带来的绕镀问题,而且使双面氧化铝在双面PERC上的使用达到单面氧化铝同样的效果,并能提高电池的转化效率。
附图说明
图1为本发明的剖视结构图。
具体实施方式
下面结合实施例,对本发明的具体实施方式作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案,而不能以此来限制本发明的保护范围。
实施例一:
本实施例涉及一种双面氧化铝结构的PERC双面电池,包括硅片1和设于硅片正面的正电极5,所述硅片正面依次设有正面二氧化硅层2、正面氧化铝膜3和减反膜4;所述硅片的背面依次形成有背面二氧化硅层6、背面氧化铝膜7、钝化膜8和背电极9;其中正面二氧化硅层厚度为4nm,而背面二氧化硅层厚度为1.5nm。
本实施例涉及的双面氧化铝结构的PERC双面电池制备方法步骤如下:
1)选择P型硅片,其电阻率1Ω·cm;
2)清洗、制绒;
3)磷扩散制备pn结;
4)去PSG清洗,酸或碱进行背面抛光;
5)退火氧化,将硅片以背靠背插片方式送入炉管内700℃进行退火并氧化13min,使在硅片正面生长的层厚度为4nm,背面SiO2层厚度为1.5nm;
6)双面镀氧化铝膜,采用Temporal ALD方式,将硅片单插方式在ALD腔室内,真空条件下周期性通入TMA、N2、H2O双面沉积厚度为4nm的氧化铝膜;
7)正面减反膜沉积,使用PECVD方式依次沉积SiOx、SiNx、SiON形成相互叠加的多层膜,总膜厚在80nm;
8)背面钝化膜沉积,使用PECVD方式沉积SiOx或SiNx形成多层结构,总膜厚为100nm;
9)激光开槽,同时用激光打出对位mark点;
10)丝网印刷、烧结,背面电极印刷、背面铝栅线印刷,正面电极以及栅线印刷,然后高温烧结。
经检测,本发明所生产太阳能电池与其它生产方式的太阳能电池座对比,其形成的电池电性能效果如下:
由此可见,本发明所涉生产工艺能提高电池的转换效率。
本发明中清洗、制绒;磷扩散制备pn结;去PSG清洗,酸或碱进行背面抛光等工序步骤为一般PERC双面电池的生产工艺,本文中进行了省略。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明技术原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (2)
1.一种双面氧化铝结构的PERC双面电池的制备方法,所述PERC双面电池包括硅片和设于硅片正面的正电极,所述硅片正面依次设有正面二氧化硅层、正面氧化铝膜和减反膜;所述硅片的背面依次形成有背面二氧化硅层、背面氧化铝膜、钝化膜和背电极;其特征在于:其制备方法包括如下步骤:
1)清洗、制绒;
2)磷扩散制备pn结;
3)背面抛光、刻蚀,去PSG;
4)退火氧化,将硅片以背靠背方式插片送入炉管内,在500-750℃温度下进行退火氧化,控制退火氧化时间在10-20min,使硅片正面生长的二氧化硅层厚度大于3nm,硅片背面生长的二氧化硅层厚度小于3nm;
5)双面镀氧化铝膜,采用Temporal ALD方式,将硅片单插方式在ALD腔室内,真空条件下周期性通入TMA、N2、H2O双面沉积氧化铝膜;
6)正面减反膜沉积;
7)背面钝化膜沉积;
8)激光开槽;
9)丝网印刷、烧结。
2.根据权利要求1所述的制备方法,其特征在于:所述正面二氧化硅层厚度控制在大于3nm小于5nm,背面二氧化硅层厚度控制在1-2nm。
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