Promoted monolithic perovskite/organic tandem solar cells through elaborate manipulation of light transmission and carrier tunneling in interconnect junction  

作　　者：Rongbo Wang Jiawei Zhang Juntao Zhao Ya Wang Yi Ding Ying Zhao Xiaodan Zhang Guofu Hou 

机构地区：[1]Institute of Photoelectronic Thin Film Devices and Technology,Renewable Energy Conversion and Storage Center,Solar Energy Conversion Center,Nankai University,Tianjin 300350,China [2]Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin,Tianjin 300350,China [3]Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education,Tianjin 300350,China [4]State Key Laboratory of Photovoltaic Materials and Solar Cells,Tianjin 300350,China

出　　处：《Science China Chemistry》2024年第9期3131-3139,共9页中国科学（化学英文版）

基　　金：supported by the Key Project of the Nature Science Foundation of Tianjin(22JCZDJC00120);the 111 Project(B16027)。

摘　　要：Monolithic perovskite/organic tandem solar cells(TSCs)have emerged as promising thin film solar cells.It is recognized that interconnect junction plays a pivotal role in tandem devices.Consequently,wide bandgap Cs_(0.25)FA_(0.75)Pb(I_(0.6)Br_(0.4))_(3)perovskite top-cell and narrow bandgap PM6:Y6:PC_(61)BM ternary organic bottom-cell were integrated in this study with several kinds of thin metal interconnect layers,which provides feasibility to elaborately manipulate light transmission and carrier tunneling process in interconnect junction.It is confirmed that,in comparison with Au,employing an Ag interconnect layer elevates integrated transmittance of light in longer wavelength regions,mainly because of the alleviated screening effect with a lower free electron concentration,which offers sufficient light harvest for the bottom-cell.Meanwhile,established energy barriers with moderate height afford convenient extraction and recombination for both holes and electrons.Hence,the performance of TSCs is promoted substantially.Moreover,an innovative Ag/Au double interconnect layer is proposed accordingly,which can preserve exceptional conductivity and light transmission and further reduce barrier height,especially for hole tunneling,by optimizing the band alignment between the interconnect layer and bottom-cell.Resultantly,the monolithic perovskite/organic TSC with a striking efficiency of 23.26% is achieved.In a word,this study can pave a general approach toward high-performance TSCs integration.

关 键 词：tandem solar cells band alignment PEROVSKITE organic solar cells interconnect junction 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]