Xufeng Liao: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China.
Xuefei Jia: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China.
Weisheng Li: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China.
Xiting Lang: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, PR China.
Jianhua Zhang: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China.
Xinyu Zhao: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China.
Yitong Ji: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China.
Qingguo Du: School of information engineering, Wuhan University of Technology, Wuhan, PR China. ORCID
Chun-Hsiao Kuan: Department of Applied Chemistry, and Institute of Molecular Science National Yang Ming Chiao Tung University 1001 Ta-Hseuh Rd, Hsinchu, Taiwan.
Zhiwei Ren: Department of Electrical and Electronic Engineering, Photonics Research Institute (PRI), Research Institute for Intelligent Wearable Systems (iWEAR), The Hong Kong Polytechnic University, Hong Kong, PR China. ORCID
Wenchao Huang: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China. ORCID
Yang Bai: Faculty of Materials Science and Energy Engineering, Shenzhen University of Advanced Technology, Shenzhen, PR China. ORCID
Kaicheng Zhang: Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstrasse 7, Erlangen, Germany. ORCID
Chuanxiao Xiao: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, PR China. ORCID
Qianqian Lin: Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, PR China. ORCID
Yi-Bing Cheng: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China. ORCID
Jinhui Tong: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China. jinhui.tong@whut.edu.cn. ORCID
All-perovskite tandem solar cells (APTSCs) offer the potential to surpass the Shockley-Queisser limit of single-junction solar cells at low cost. However, high-performance APTSCs contain unstable methylammonium (MA) cation in the tin-lead (Sn-Pb) narrow bandgap subcells. Currently, MA-free Sn-Pb perovskite solar cells (PSCs) show lower performance compared with their MA-containing counterparts. This is due to the high trap density associated with Sn oxidation, which is exacerbated by the rapid crystallization of MA-free Sn-containing perovskite. Here, a multifunctional additive rubidium acetate (RbAC) is proposed to passivate Sn-Pb perovskite. We find that RbAC can suppress Sn oxidation, alleviate microstrain, and improve the crystallinity of the MA-free Sn-Pb perovskite. Consequently, the resultant Sn-Pb PSCs achieve a power conversion efficiency (PCE) of 23.02%, with an open circuit voltage (Voc) of 0.897 V, and a filling factor (FF) of 80.64%, and more importantly the stability of the device is significantly improved. When further integrated with a 1.79-electron volt MA-free wide-bandgap PSC, a 29.33% (certified 28.11%) efficient MA-free APTSCs with a high Voc of 2.22 volts is achieved.
References
Science. 2016 Oct 14;354(6309):206-209
[PMID: 27708053]
J Am Chem Soc. 2017 Oct 11;139(40):14173-14180
[PMID: 28892374]
