Antimony Potassium Tartrate Stabilizes Wide-Bandgap Perovskites for Inverted 4-T All-Perovskite Tandem Solar Cells with Efficiencies over 26%  

作　　者：Xuzhi Hu Jiashuai Li Chen Wang Hongsen Cui Yongjie Liu Shun Zhou Hongling Guan Weijun Ke Chen Tao Guojia Fang 

机构地区：[1]Key Laboratory of Artificial Micro/Nano Structures of Ministry of Education,School of Physics and Technology,Wuhan University,Wuhan 430072,People’s Republic of China

出　　处：《Nano-Micro Letters》2023年第7期204-217,共14页纳微快报（英文版）

基　　金：supported by the National High Technology Research and Development Program(2015AA050601);the National Natural Science Foundation of China(61904126,12134010,12174290)。

摘　　要：Wide-bandgap(WBG)perovskites have been attracting much attention because of their immense potential as a front light-absorber for tandem solar cells.However,WBG perovskite solar cells(PSCs)generally exhibit undesired large open-circuit voltage(VOC)loss due to light-induced phase segregation and severe non-radiative recombination loss.Herein,antimony potassium tartrate(APTA)is added to perovskite precursor as a multifunctional additive that not only coordinates with unbonded lead but also inhibits the migration of halogen in perovskite,which results in suppressed non-radiative recombination,inhibited phase segregation and better band energy alignment.Therefore,a APTA auxiliary WBG PSC with a champion photoelectric conversion efficiency of 20.35%and less hysteresis is presented.They maintain 80%of their initial efficiencies under 100 mW cm^(-2)white light illumination in nitrogen after 1,000 h.Furthermore,by combining a semi-transparent WBG perovskite front cell with a narrow-bandgap tin–lead PSC,a perovskite/perovskite four-terminal tandem solar cell with an efficiency over 26%is achieved.Our work provides a feasible approach for the fabrication of efficient tandem solar cells.

关 键 词：Perovskite solar cell Tandem Wide bandgap Multifunctional additive 

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]