High-throughput compositional mapping of triple-cation tin-lead perovskites for high-efficiency solar cells  

作　　者：Rajendra Kumar Gunasekaran Jina Jung Sung Woong Yang Jungchul Yun Yeonghun Yun Devthade Vidyasagar Won Chang Choi Chang-Lyoul Lee Jun Hong Noh Dong Hoe Kim Sangwook Lee 

机构地区：[1]School of Materials Science and Engineering,Kyungpook National University,Daegu,Republic of Korea [2]Advanced Photonics Research Institute(APRI),Gwangju Institute of Science and Technology(GIST),Gwangju,Republic of Korea [3]School of Civil,Environmental and Architectural Engineering,Green School,Korea University,Seoul,Republic of Korea [4]Department of Materials Science and Engineering,Korea University,Seoul,Republic of Korea

出　　处：《InfoMat》2023年第4期25-38,共14页信息材料（英文）

基　　金：supported by the Korea Electric Power Corporation(Grant number:R20XO02-1);the National Research Foundation of Korea(NRF)funded by the Ministry of Science,ICT(NRF-2019R1A2C1084010).

摘　　要：Mixed tin-ead perovskites suffer from structural instability and rapid tin oxidation;thus,the investigation of their optimal composition ranges is important to address these inherent weaknesses.The critical role of triple cations in mixed Sn–Pb iodides is studied by performing a wide range of compositional screenings over mechanochemically synthesized bulk and solution-processed thin films.A ternary phase map of FA(Sn_(0.6)Pb_(0.4))I_(3),MA(Sn_(0.6)Pb_(0.4))I_(3),and Cs(Sn_(0.6)Pb_(0.4))I_(3)is formed,and a promising composition window of(FA_(0.6-x)MA_(0.4)Cs_(x))Sn_(0.6)Pb_(0.4)I_(3)(0≤x≤0.1)is demonstrated through phase,photoluminescence,and stability evaluations.Solar cell performance and chemical stability across the targeted compositional space are investigated,and FA_(0.55)MA_(0.4)Cs_(0.05)Sn_(0.6)Pb_(0.4)I_(3)with strain-relaxed lattices,reduced defect densities,and improved oxidation stability is demonstrated.The inverted perovskite solar cells with the optimal composition demonstrate a power conversion efficiency of over 22%with an open-circuit voltage of 0.867 V,which corresponds to voltage loss of 0.363 V,promising for the development of narrow-bandgap perovskite solar cells.

关 键 词：compositional engineering mixed tin-ead iodides narrow-bandgap perovskites perovskite solar cells strain relaxation ternary phase mapping 

分 类 号：O62[理学—有机化学]