减小边缘复合助力28%效率的四端钙钛矿/硅叠层太阳能电池  

Four-terminal perovskite/silicon series solar cells with 28%efficiency achieved by suppressing edge recombination

作　　者：方正 张飞 秦校军[1] 杨柳[2] 靳永斌 周养盈 王兴涛 刘云 谢立强 魏展画 Fang Zheng;Zhang Fei;Qin Xiao-Jun;Yang Liu;Jin Yong-Bin;Zhou Yang-Ying;Wang Xing-Tao;Liu Yun;Xie Li-Qiang;Wei Zhan-Hua(China Huaneng Clean Energy Research Institute,Beijing 102209,China;Institute of Luminescent Materials and Information Displays,Huaqiao University,Xiamen 361021,China;Institute of Manufacturing Engineering,Huaqiao University,Xiamen 361021,China)

机构地区：[1]中国华能集团清洁能源技术研究院有限公司,北京102209 [2]华侨大学发光材料与信息显示研究院,厦门361021 [3]华侨大学制造工程研究院,厦门361021

出　　处：《物理学报》2023年第5期340-348,共9页Acta Physica Sinica

基　　金：区域创新发展联合基金重点项目(批准号:U21A2078);国家自然科学基金(批准号:22179042)资助的课题。

摘　　要：钙钛矿/硅叠层太阳能电池由于能突破单结太阳能电池的效率极限而吸引了广泛的研究兴趣.然而,在将商业化的大面积硅电池切割为实验室所需的平方厘米级的小面积电池时,会造成显著的效率下降,限制了叠层电池的性能.为了消除传统的激光切割法造成的热损伤和热传导,减少切割后的异质结硅电池的非辐射复合,本工作采用砂轮划片这一冷加工方法,对异质结硅电池进行切割.与采用激光切割法得到的器件相比,冷加工法得到的异质结硅电池的截面损伤小,非辐射复合得到显著抑制,器件的开路电压和填充因子均得到提高,平均光电转换效率提高了1%.将得到的硅电池与正式半透明钙钛矿太阳能电池进行机械堆叠,获得了效率超过28%的四端钙钛矿/硅叠层太阳能电池.Although the commercial application of solar cells pursues scalable and large-area devices,small-area solar cells on a scale of several centimeters possess many advantages such as low fabrication cost and facile highthroughput screening in the research laboratory.Most emerging photovoltaic technology starts from the studying of small-area devices.Recently,perovskite/silicon tandem solar cells have aroused extensive research interest because they can break through the radiative efficiency limit of single-junction solar cells.However,when commercial large-area silicon cells are cut into small pieces with a few squared centimeters in area for laboratory use,there occurs a significant efficiency loss,limiting the performance of tandem cells.Herein,to eliminate the thermal damage caused by the traditional laser cutting method and also reduce the non-radiative recombination of heterojunction silicon cells after being cut,a cold-manufacturing method of grinding wheel dicing is used to cut heterojunction silicon cells.This method is realized by high-speed mechanical grinding accompanied by liquid washing,which avoids damaging the edge of solar cell caused by heat.Compared with the device cut by laser,the heterojunction silicon cells cut by the cold-manufacturing method exhibit less crosssectional damage.The measurements by scanning electron microscopy(SEM)and three-dimensional optical profilometer reveal that the morphology of the device edge is smoother than the counterpart cut by laser.Device physics measurements including electrochemical impedance spectrum(EIS),dark current-voltage curves,transient photovoltage(TPV),transient photocurrent(TPC),and the dependence of short-circuit current density and open-circuit voltage on light intensity reveal that the cold-manufacturing method can significantly prevent the heterojunction silicon cells from non-radiatively recombining after being cut.These results indicate that the edge-recombination of the silicon solar cells cut by grinding wheels is reduced compared with that cut

关 键 词：硅电池切割 边缘复合 异质结电池 钙钛矿/硅叠层太阳能电池 

分 类 号：TM914.4[电气工程—电力电子与电力传动]