Surface-functionalized hole-selective monolayer for high efficiency single-junction wide-bandgap and monolithic tandem perovskite solar cells  

作　　者：Devthade Vidyasagar Yeonghun Yun Jae Yu Cho Hyemin Lee Kyung Won Kim Yong Tae Kim Sung Woong Yang Jina Jung Won Chang Choi Seonu Kim Rajendra Kumar Gunasekaran Seok Beom Kang Kwang Heo Dong Hoe Kim Jaeyeong Heo Sangwook Lee 

机构地区：[1]School of Materials Science and Engineering,Kyungpook National University,Daegu 41566,Republic of Korea [2]Department of Materials Science and Engineering,and Optoelectronics Convergence Research Center,Chonnam National University,Gwangju 61186,Republic of Korea [3]Department of Materials Science and Engineering,Korea University,Seoul 02841,Republic of Korea [4]Department of Nanotechnology and Advanced Materials Engineering,Sejong University,Seoul 05006,Republic of Korea

出　　处：《Journal of Energy Chemistry》2024年第1期317-326,I0008,共11页能源化学（英文版）

基　　金：supported by the National Research Foundation of Korea (NRF)the Ministry of Science,ICT (2022M3J1A1085285,2019R1A2C1084010,and 2022R1A2C2006532);the Korea Electric Power Corporation (R20XO02-1)。

摘　　要：Carbazole moiety-based 2PACz([2-(9H-carbazol-9-yl)ethyl]phosphonic acid)self-assembled monolayers(SAMs)are excellent hole-selective contact(HSC)materials with abilities to excel the charge-transferdynamics of perovskite solar cells(PSCs).Herein,we report a facile but powerful method to functionalize the surface of 2PACz-SAM,by which reproducible,highly stable,high-efficiency wide-bandgap PSCs can be obtained.The 2PACz surface treatment with various donor number solvents improves assembly of 2PACz-SAM and leave residual surface-bound solvent molecules on 2PACz-SAM,which increases perovskite grain size,retards halide segregation,and accelerates hole extraction.The surface functionalization achieves a high power conversion efficiency(PCE)of 17.62%for a single-junction wide-bandgap(~1.77 e V)PSC.We also demonstrate a monolithic all-perovskite tandem solar cell using surfaceengineered HSC,showing high PCE of 24.66%with large open-circuit voltage of 2.008 V and high fillfactor of 81.45%.Our results suggest this simple approach can further improve the tandem device,when coupled with a high-performance narrow-bandgap sub-cell.

关 键 词：Perovskite solar cells 2PACz Monolithic tandem solar cells Wide bandgap 

分 类 号：TM914.4[电气工程—电力电子与电力传动]