Stability Improvement of Tin-Based Halide Perovskite by Precursor-Solution Regulation with Dual-Functional Reagents

Cao Xiangrong; Li Jingrui; Dong HuaLi PeizhouFan QinhuaXu RuoyaoLi HaomiaoZhou GuijiangWu Zhaoxin

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Stability Improvement of Tin-Based Halide Perovskite by Precursor-Solution Regulation with Dual-Functional Reagents

机译：Stability Improvement of Tin-Based Halide Perovskite by Precursor-Solution Regulation with Dual-Functional Reagents

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Tin-based halide perovskites have attracted great attention in the perovskite solar cells (PSCs) community with their suitable band gaps, excellent optoelectronic properties, and non-toxicity. However, because of their poor chemical stability, it is challenging to fabricate highly stable and efficient tin PSCs (TPSCs). In this study, the origin of the Sn2+ oxidation ahead of film formation is concentrated on, and it is found that the ionization of SnI2 in precursor plays a decisive role. Accordingly, SnI2 dissociation and the subsequent Sn2+ oxidation can be restricted in precursor by employing reductive complexes as additives. This dual-functional source-regulating strategy effectively helps prepare high-quality perovskite films with low Sn4+ defect densities. As a result, the unencapsulated TPSCs show a considerable power-conversion efficiency of 10.03% (certified 9.38%) and maintain 90% of its initial efficiency after 1000 h of light aging testing.

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《Advanced functional materials》 |2021年第40期|2104344.1-2104344.9|共9页
作者
Cao Xiangrong; Li Jingrui; Dong HuaLi PeizhouFan QinhuaXu RuoyaoLi HaomiaoZhou GuijiangWu Zhaoxin;
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作者单位

Xi An Jiao Tong Univ, Key Lab Phys Elect & Devices, Minist Educ, Sch Elect Sci & Engn, 28 Xianning West Rd, Xian 710049, Peoples R China|Xi An Jiao Tong Univ, Shaanxi Key Lab Informat Photon Tech, Sch Elect Sci & Engn, 28 Xianning West Rd, Xian 710049, Pe;

Xi An Jiao Tong Univ, Elect Mat Res Lab, Key Lab Minist Educ, Sch Elect Sci & Engn, 28 Xianning West Rd, Xian 710049, Peoples R China|Xi An Jiao Tong Univ, Int Ctr Dielect Res, Sch Elect Sci & Engn, 28 Xianning West Rd, Xian 710049, Peoples R China;

Ningbo Exciton Innovat Mat Res Inst CO LTD, Block 6A,Yunsheng Ind Pk 428 Mingzhu Rd, Ningbo 315040, Peoples R ChinaXi An Jiao Tong Univ, MOE Key Lab Nonequilibrium Synth & Modulat Conden, State Key Lab Mech Behav Mat, Dept Chem,Sch Sci, 28 Xianning West Rd, Xian 710049, Peoples R China;

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lead-free; perovskite solar cells; precursors; source-regulating defects; stability;

Stability Improvement of Tin-Based Halide Perovskite by Precursor-Solution Regulation with Dual-Functional Reagents

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