CN110416364A - 单晶perc背面碱刻蚀工艺 - Google Patents
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- H—ELECTRICITY
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30604—Chemical etching
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- H—ELECTRICITY
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- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic System
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- H—ELECTRICITY
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- H01L31/186—Particular post-treatment for the devices, e.g. annealing, impurity gettering, short-circuit elimination, recrystallisation
- H01L31/1868—Passivation
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/547—Monocrystalline silicon PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
本发明涉及太阳能电池生产领域,单晶PERC背面碱刻蚀工艺,背面去除PSG,在硅片正面采用水膜保护的条件下,利用氢氟酸水溶液中对硅片背面扩散后形成的PSG进行去除;去PSG中要防止正面过刻,否则后续进一步抛光时会破坏pn结;背面碱抛光,整个背面碱抛光过程控制硅片减重0.2±0.01g,背面碱抛光按照预清洗、碱抛光、碱清洗、酸清洗进行,预清洗过程采用氢氧化钾和双氧水溶液进行清洗,碱抛光采用化学辅助剂进行抛光,碱清洗采用氢氧化钾和双氧水溶液混合液进行清洗,酸清洗采用氢氟酸和盐酸混合水溶液进行。
Description
技术领域
本发明涉及太阳能电池生产领域,特别涉及单晶PERC背面刻蚀领域。
背景技术
当前PERC电池片如火如荼,原本以硝酸、氢氟酸混合溶液为主的酸刻蚀清洗工艺,虽然在工艺导通、电池片成型方面已经攻克全部技术难题,但是由于工艺本身涉及到大量酸消耗,会产生大量的浓酸含氮污水,处理起来任务较重,成本也高。同时,混和酸溶液清洗中的酸耗量巨大,生产中也是一项巨额支出。
在不同刻蚀(抛光)工艺下,硅片表面的形貌也不同,酸抛光较之碱抛光的背面结构更加粗糙,并且反射率也会更低,在30%左右,而碱抛光的背面是一种趋向镜面的工艺模式,反射率在36%以上,表面平整度更高的往往更有利于背面钝化,在应用氧化铝做背面钝化的路线中,碱抛光后的结构具有更好的兼容性,从而在最终使电池片获得更高的转化效率。作为一种湿法刻蚀工艺,碱清洗同样存在相同的药液寿命问题,以及良率等问题,这些也需要在工艺进程中进行不断的完善。
发明内容
本发明所要解决的技术问题是:如何克服背景技术的不足,保证单晶PERC电池片生产中的酸刻蚀清洗工艺向碱刻蚀工艺平稳过渡,提高背面钝化的效果(更优钝化方式的兼容性),提高电池片的转化效率,并且降低工艺成本。
本发明所采用的技术方案是:单晶PERC背面碱刻蚀工艺,在单晶PERC背面刻蚀过程中按照如下的步骤进行
步骤一、背面去除PSG,在硅片正面采用水膜保护的条件下,利用氢氟酸水溶液中对硅片背面扩散后形成的PSG进行去除;去PSG中要防止正面过刻,否则后续进一步抛光时会破坏pn结。
步骤二、背面碱抛光,整个背面碱抛光过程控制硅片减重0.2±0.01g,,背面碱抛光按照预清洗、碱抛光、碱清洗、酸清洗进行,预清洗过程采用氢氧化钾和双氧水溶液进行清洗,碱抛光采用化学辅助剂进行抛光,碱清洗采用氢氧化钾和双氧水溶液混合液进行清洗,酸清洗采用氢氟酸和盐酸混合水溶液进行。可以在槽式机中进行,使硅片经历预清洗、碱抛光(刻蚀)、碱清洗、酸洗完成背面抛光工艺过程;
步骤一中,氢氟酸水溶液中,氢氟酸质量百分比浓度为5%-10%。
步骤二中,预清洗工艺条件为,预清洗溶液中,氢氧化钾的质量百分比浓度为0.18%-0.22%,双氧水的质量百分比浓度为5%-6%,清洗时间为50-90s,温度为40℃。
步骤二中,碱抛光工艺条件为,化学辅助剂中氢氧化钾浓度为150克/升-280克/升,亚硝酸钾浓度为100克/升-150克/升,氟化钾浓度为1克/升-1.2克/升,磷酸钾浓度为10克/升-20克/升,溶剂为水,清抛光时间为3-4min,温度为70℃。
步骤二中,碱清洗工艺条件为,碱清洗溶液中,氢氧化钾的质量百分比浓度为0.38%-0.42%,双氧水的质量百分比浓度为5%-6%,清洗时间为,2-3 min,温度为60℃。
步骤二中,酸清洗工艺条件为,酸清洗溶液中,氢氟酸质量百分比浓度为9%-11%,盐酸质量百分比浓度为9%-11%,清洗2-3min。
本发明的有益效果是:成功完成酸刻蚀到碱刻蚀的工艺转换;节约工艺成本,也同时节约废液处理成本;提高了背面钝化的兼容性以及背面钝化的效果,提高电池片转化效率。在降低生产成本的同时也提高了电池片的光电转化效率,约0.15%(特别适用于与氧化铝钝化的配合),并且具有良好的产线适用性。
具体实施方式
单晶PERC背面碱刻蚀工艺,在单晶PERC背面刻蚀过程中按照如下的步骤进行
步骤一、背面去除PSG,采用链式湿法设备,在硅片正面采用水膜保护的条件下,利用氢氟酸水溶液中对硅片背面扩散后形成的PSG进行去除;去PSG中要防止正面过刻,否则后续进一步抛光时会破坏pn结,保证正面亲水,背面疏水。氢氟酸水溶液中,氢氟酸质量百分比浓度为5%-10%,当质量百分比浓度小于5%时,补液量约20mL/100pcs。
步骤二、背面碱抛光,整个背面碱抛光过程控制硅片减重0.2±0.01g,,背面碱抛光按照预清洗、碱抛光、碱清洗、酸清洗进行,预清洗过程采用氢氧化钾和双氧水溶液进行清洗,碱抛光采用化学辅助剂进行抛光,碱清洗采用氢氧化钾和双氧水溶液混合液进行清洗,酸清洗采用氢氟酸和盐酸混合水溶液进行。可以在槽式机中进行,使硅片经历预清洗、碱抛光(刻蚀)、碱清洗、酸洗完成背面抛光工艺过程;
步骤二中,预清洗工艺条件为,预清洗溶液中,氢氧化钾的质量百分比浓度为0.18%-0.22%,双氧水的质量百分比浓度为5%-6%,清洗时间为50-90s,温度为40℃。
步骤二中,碱抛光工艺条件为,化学辅助剂中氢氧化钾浓度为150克/升-280克/升,亚硝酸钾浓度为100克/升-150克/升,氟化钾浓度为1克/升-1.2克/升,磷酸钾浓度为10克/升-20克/升,溶剂为水,清抛光时间为3-4min,温度为70℃。
步骤二中,碱清洗工艺条件为,碱清洗溶液中,氢氧化钾的质量百分比浓度为0.38%-0.42%,双氧水的质量百分比浓度为5%-6%,清洗时间为,2-3 min,温度为60℃。
步骤二中,酸清洗工艺条件为,酸清洗溶液中,氢氟酸质量百分比浓度为9%-11%,盐酸质量百分比浓度为9%-11%,清洗2-3min。
每400片(后简称pcs)需要置换槽内5-10L溶液,保证刻蚀液的活性,另外需要保证前后清洗槽内的双氧水的浓度,从而保证硅片表面的清洁度。
抛光工艺槽需要严格的配补液,具体为碱液补充200mL/100pcs,化学辅助剂随着生产的不断进行为阶段性补液——在4000pcs以内,补液400mL/400pcs;在4000pcs-8000pcs,补液500mL/400pcs;在8000pcs-16000pcs以内,补液700mL/400pcs;刻蚀过程中,主工艺槽需要开启定量排液功能,每400pcs需要置换槽内5-10L溶液,保证刻蚀液的活性,另外需要保证前后清洗槽内的双氧水的体积比浓度维持在5%-6%。
在完成碱抛光等工艺后,按照常规单晶PERC电池片的工艺制程,即可完成。
Claims (6)
1.单晶PERC背面碱刻蚀工艺,其特征在于:在单晶PERC背面刻蚀过程中按照如下的步骤进行
步骤一、背面去除PSG,在硅片正面采用水膜保护的条件下,利用氢氟酸水溶液中对硅片背面扩散后形成的PSG进行去除;去PSG中要防止正面过刻,否则后续进一步抛光时会破坏pn结;
步骤二、背面碱抛光,整个背面碱抛光过程控制硅片减重0.2±0.01g,背面碱抛光按照预清洗、碱抛光、碱清洗、酸清洗进行,预清洗过程采用氢氧化钾和双氧水溶液进行清洗,碱抛光采用化学辅助剂进行抛光,碱清洗采用氢氧化钾和双氧水溶液混合液进行清洗,酸清洗采用氢氟酸和盐酸混合水溶液进行。
2.根据权利要求1所述的单晶PERC背面碱刻蚀工艺,其特征在于:步骤一中,氢氟酸水溶液中,氢氟酸质量百分比浓度为5%-10%。
3.根据权利要求1所述的单晶PERC背面碱刻蚀工艺,其特征在于:步骤二中,预清洗工艺条件为,预清洗溶液中,氢氧化钾的质量百分比浓度为0.18%-0.22%,双氧水的质量百分比浓度为5%-6%,清洗时间为50-90s,温度为40℃。
4.根据权利要求1所述的单晶PERC背面碱刻蚀工艺,其特征在于:步骤二中,碱抛光工艺条件为,化学辅助剂中氢氧化钾浓度为150克/升-280克/升,亚硝酸钾浓度为100克/升-150克/升,氟化钾浓度为1克/升-1.2克/升,磷酸钾浓度为10克/升-20克/升,溶剂为水,清抛光时间为3-4min,温度为70℃。
5.根据权利要求1所述的单晶PERC背面碱刻蚀工艺,其特征在于:步骤二中,碱清洗工艺条件为,碱清洗溶液中,氢氧化钾的质量百分比浓度为0.38%-0.42%,双氧水的质量百分比浓度为5%-6%,清洗时间为,2-3 min,温度为60℃。
6.根据权利要求1所述的单晶PERC背面碱刻蚀工艺,其特征在于:步骤二中,酸清洗工艺条件为,酸清洗溶液中,氢氟酸质量百分比浓度为9%-11%,盐酸质量百分比浓度为9%-11%,清洗2-3min。
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CN111074280A (zh) * | 2019-12-20 | 2020-04-28 | 中建材浚鑫科技有限公司 | 一种新型碱抛光工艺 |
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CN112768554A (zh) * | 2020-12-30 | 2021-05-07 | 横店集团东磁股份有限公司 | 基于背面全接触钝化材料的碱抛光方法、晶硅太阳能电池及制备方法 |
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CN115588700A (zh) * | 2022-10-19 | 2023-01-10 | 通威太阳能(眉山)有限公司 | 一种perc电池片及其制备方法 |
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