CN112143573B - 硅片碱抛后清洗用添加剂及其应用 - Google Patents
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Abstract
本发明公开了一种硅片碱抛后清洗用添加剂,由1~3质量份柠檬酸、0.3~0.5质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~2质量份硫酸钠、2~3质量份氯化钠和85~97质量份水组成。本发明的添加剂可以直接应用于现有清洗设备上,对碱抛后的硅片进行清洗时,在清洗液中加入本发明的添加剂,可改善硅片清洗效果,对多种痕量级杂质有强力的去除作用,且不会形成新的沾污,可通过改善硅片表面的清洁度来提升电池效率。
Description
技术领域
本发明涉及光伏领域,具体涉及一种硅片碱抛后清洗用添加剂及其应用。
背景技术
在晶硅电池的湿法生产工艺中,存在着多种污染源,空气中的灰尘颗粒、刻蚀液中的化学药品、硅微粉、水中的杂质、润滑油、密封胶、设备容器和管路中的污染等,均有可能导致硅片在清洗中和清洗后出现污染,污染以有机物、金属、固体颗粒等多种形式存在。其中危害最大的是金属污染,因为硅表面的金属离子或单质在高温或电场加速的条件下,会硅片表面扩散至硅片内部,形成大量深能级复合中心,严重降低少子寿命,引起漏电流增加。此外硅片表面富集的各种污染还会对后期的氧化、镀膜造成不良影响,这些问题均会导致电池片良品率下降,效率降低。因此,光伏行业领域迫切需要一种能在碱抛光后,在氧化以及镀膜工序前,解决污染问题的清洗添加剂。
目前光伏行业中,在抛光后均采用湿法清洗,先用碱和双氧水氧化分解去除有机物,再用盐酸和氢氟酸配合清洗去除氧化硅和金属,部分会额外加入清洗剂。但常规清洗剂有如下缺陷:只能对部分类型杂质起到清洗作用,且只在杂质浓度较高时有效,尤其是对于接近仪器检出限的超痕量PPB-PPM浓度级别污染不理想;对于碱金属离子较为有效,但对于严重影响电池效率的重金属元素作用较差;清洗剂自身有严重的沾污,出现除杂后引入新杂质的现象,以至于出现污点、斑块或液体流痕;对复杂绒面的清洗效果差。
发明内容
本发明的目的在于提供一种硅片碱抛后清洗用添加剂及其应用,对碱抛后的硅片进行清洗时,在清洗液中加入本发明的添加剂,可改善硅片清洗效果,对多种痕量级杂质有强力的去除作用,且不会形成新的沾污,可通过改善硅片表面的清洁度来提升电池效率。
为实现上述目的,本发明提供一种硅片碱抛后清洗用添加剂,由1~3质量份柠檬酸、0.3~0.5质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~2质量份硫酸钠、2~3质量份氯化钠和85~97质量份水组成。
优选的,上述硅片碱抛后清洗用添加剂,由1~2质量份柠檬酸、0.3~0.4质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~1.5质量份硫酸钠、2.5~3质量份氯化钠和90~95质量份水组成。
优选的,所述水为去离子水。
本发明还提供一种硅片碱抛后清洗用清洗液,其含有酸溶液和上述的添加剂,添加剂与酸溶液的质量比为0.5~2:100;所述酸溶液为氢氟酸的水溶液。
优选的,所述酸溶液中含有5~15wt%的氢氟酸。
优选的,所述酸溶液中还配入了盐酸。
优选的,所述酸溶液中含有5~15wt%的氢氟酸和5~15wt%的盐酸。
本发明还提供一种硅片碱抛后清洗方法,利用上述的清洗液对碱抛后的硅片进行清洗。
优选的,上述硅片碱抛后清洗方法,其具体步骤包括:
1)配制添加剂:将1~3质量份柠檬酸、0.3~0.5质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~2质量份硫酸钠、2~3质量份氯化钠加入到85~97质量份水中,混合均匀配成添加剂;
2)配制清洗液:将步骤1)制成的添加剂加到酸溶液中,混合均匀配成清洗液;添加剂与酸溶液的质量比为0.5~2:100;酸溶液为氢氟酸的水溶液;酸溶液中含有5~15wt%的氢氟酸;
3)将单晶或多晶硅片浸入步骤2)制得的清洗液中,清洗2~3min。
优选的,步骤1)中,将1~2质量份柠檬酸、0.3~0.4质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~1.5质量份硫酸钠、2.5~3质量份氯化钠加入到85~97质量份水中,混合均匀配成添加剂。
优选的,步骤2)中,所述酸溶液中还配入了盐酸;酸溶液中含有5~15wt%的氢氟酸和5~15wt%的盐酸。
本发明的优点和有益效果在于:提供一种硅片碱抛后清洗用添加剂及其应用,本发明的添加剂可以直接应用于现有清洗设备上,对碱抛后的硅片进行清洗时,在清洗液中加入本发明的添加剂,可改善硅片清洗效果,对多种痕量级杂质有强力的去除作用,且不会形成新的沾污,可通过改善硅片表面的清洁度来提升电池效率。
清洗液配入本发明的添加剂后,对固体微粒、有机油污、痕量金属离子及其单质,均有良好的剥离润湿包裹作用,还可利用配位等化学键合抓取硅片上的微量杂质并絮凝成稳态胶束,比分子间作用力更加牢固有效且与硅片互相排斥;且清洗后会在硅片上形成保护层,阻止剥离下来的杂质二次吸附,且保护层易在去离子水中被洗净,不会形成沾污。
采用配入本发明添加剂的清洗液对碱抛后的硅片进行清洗,具有如下优势:
1、能够提高电池少子寿命、电流电压、以及填充因子FF,显著降低反向漏电流。
2、降低低效片出现概率,提高生产良率,提高电池平均效率。
3、对痕量杂质有很好的除杂作用,结合牢固,且能长期保护硅片表面清洁。
4、润湿性好,在复杂结构绒面以及卡齿处的硅片清洗上有着优越的能力。
5、可在较宽的PH和温度条件下使用,耐酸耐碱耐高低温。
6、使用方便,工艺简单,对硅片无损伤,清洗速度快。
7、无刺激性气味,无磷无毒不可燃无腐蚀,安全环保。
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。
本发明对碱抛后的硅片进行清洗,具体步骤包括:
1)配制添加剂:将1~3质量份柠檬酸、0.3~0.5质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~2质量份硫酸钠、2~3质量份氯化钠加入到85~97质量份去离子水中,混合均匀配成添加剂;
2)配制清洗液:将步骤1)制成的添加剂加到酸溶液中,混合均匀配成清洗液;添加剂与酸溶液的质量比为0.5~2:100;酸溶液为氢氟酸的水溶液;酸溶液中含有5~15wt%的氢氟酸;
3)将单晶或多晶硅片浸入步骤2)制得的清洗液中,清洗2~3min。
优选的,步骤1)中,将1~2质量份柠檬酸、0.3~0.4质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~1.5质量份硫酸钠、2.5~3质量份氯化钠加入到90~95质量份水中,混合均匀配成添加剂。
优选的,步骤2)中,所述酸溶液中还配入了盐酸;酸溶液中含有5~15wt%的氢氟酸和5~15wt%的盐酸。
本发明的具体实施例如下:
实施例1
对碱抛后的硅片进行清洗,具体步骤包括:
1)配制添加剂:将2质量份柠檬酸、0.35质量份月桂醇聚氧乙烯醚、1.2质量份乙二醇、2质量份硫酸钠、2质量份氯化钠加入到85质量份去离子水中,混合均匀配成添加剂;
2)配制清洗液:将步骤1)制成的添加剂加到酸溶液中,混合均匀配成清洗液;添加剂与酸溶液的质量比为1.2:100;酸溶液为氢氟酸的水溶液;酸溶液中还配入了盐酸;酸溶液中含有5wt%的氢氟酸和5wt%的盐酸;
3)将硅片浸入步骤2)制得的清洗液中,清洗2min。
实施例2
对碱抛后的硅片进行清洗,具体步骤包括:
1)配制添加剂:将3质量份柠檬酸、0.5质量份月桂醇聚氧乙烯醚、1质量份乙二醇、1质量份硫酸钠、3质量份氯化钠加入到97质量份去离子水中,混合均匀配成添加剂;
2)配制清洗液:将步骤1)制成的添加剂加到酸溶液中,混合均匀配成清洗液;添加剂与酸溶液的质量比为2:100;酸溶液为氢氟酸的水溶液;酸溶液中还配入了盐酸;酸溶液中含有5wt%的氢氟酸和5wt%的盐酸;
3)将硅片浸入步骤2)制得的清洗液中,清洗2min。
实施例3
对碱抛后的硅片进行清洗,具体步骤包括:
1)配制添加剂:将1质量份柠檬酸、0.3质量份月桂醇聚氧乙烯醚、2质量份乙二醇、1.5质量份硫酸钠、2.5质量份氯化钠加入到95质量份去离子水中,混合均匀配成添加剂;
2)配制清洗液:将步骤1)制成的添加剂加到酸溶液中,混合均匀配成清洗液;添加剂与酸溶液的质量比为0.5:100;酸溶液为氢氟酸的水溶液;酸溶液中还配入了盐酸;酸溶液中含有5wt%的氢氟酸和5wt%的盐酸;
3)将硅片浸入步骤2)制得的清洗液中,清洗2min。
对比例1
对碱抛后的硅片进行清洗,具体步骤包括:
1)配制清洗液:将盐酸加到酸溶液中,混合均匀配成清洗液;酸溶液为氢氟酸的水溶液;清洗液中含有5wt%的氢氟酸和5wt%的盐酸;
2)将硅片浸入步骤1)制得的清洗液中,清洗2min。
将实施例1至3和对比例1清洗后的硅片制成镀膜片,典型少子寿命对比如表1所示;
表1 典型少子寿命对比
将实施例1至3和对比例1清洗后的硅片制成电池片,等条件平均效率对比如表2所示;
表2 等条件平均效率对比
通过上述对比可知,采用配入本发明添加剂的清洗液对碱抛后的硅片进行清洗,能够提高电池少子寿命、电流电压、以及填充因子FF,提高电池平均效率。
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 (10)
1.硅片碱抛后清洗用添加剂,其特征在于,由1~3质量份柠檬酸、0.3~0.5质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~2质量份硫酸钠、2~3质量份氯化钠和85~97质量份水组成。
2.根据权利要求1所述的硅片碱抛后清洗用添加剂,其特征在于,由1~2质量份柠檬酸、0.3~0.4质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~1.5质量份硫酸钠、2.5~3质量份氯化钠和90~95质量份水组成。
3.硅片碱抛后清洗用清洗液,其特征在于,其含有酸溶液和权利要求1或2所述的添加剂,添加剂与酸溶液的质量比为0.5~2:100;所述酸溶液为氢氟酸的水溶液。
4.根据权利要求3所述的硅片碱抛后清洗用清洗液,其特征在于,所述酸溶液中含有5~15wt%的氢氟酸。
5.根据权利要求3所述的硅片碱抛后清洗用清洗液,其特征在于,所述酸溶液中还配入了盐酸。
6.根据权利要求5所述的硅片碱抛后清洗用清洗液,其特征在于,所述酸溶液中含有5~15wt%的氢氟酸和5~15wt%的盐酸。
7.硅片碱抛后清洗方法,其特征在于,利用权利要求3至6中任一项所述的清洗液对碱抛后的硅片进行清洗。
8.根据权利要求7所述的硅片碱抛后清洗方法,其特征在于,其具体步骤包括:
1)配制添加剂:将1~3质量份柠檬酸、0.3~0.5质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~2质量份硫酸钠、2~3质量份氯化钠加入到85~97质量份水中,混合均匀配成添加剂;
2)配制清洗液:将步骤1)制成的添加剂加到酸溶液中,混合均匀配成清洗液;添加剂与酸溶液的质量比为0.5~2:100;酸溶液为氢氟酸的水溶液;酸溶液中含有5~15wt%的氢氟酸;
3)将硅片浸入步骤2)制得的清洗液中,清洗2~3min。
9.根据权利要求8所述的硅片碱抛后清洗方法,其特征在于,步骤1)中,将1~2质量份柠檬酸、0.3~0.4质量份月桂醇聚氧乙烯醚、1~2质量份乙二醇、1~1.5质量份硫酸钠、2.5~3质量份氯化钠加入到85~97质量份水中,混合均匀配成添加剂。
10.根据权利要求8所述的硅片碱抛后清洗方法,其特征在于,步骤2)中,所述酸溶液中还配入了盐酸;酸溶液中含有5~15wt%的氢氟酸和5~15wt%的盐酸。
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