题目：

Caffeine Improves the Performance and Thermal Stability of Perovskite Solar Cells

作者：

Rui Wang,^1,5 Jingjing Xue,^1,5 Lei Meng,¹ Jin-Wook Lee,¹ Zipeng Zhao,¹ Pengyu Sun,¹ Le Cai,¹ Tianyi Huang,¹ Zhengxu Wang,¹ Zhao-Kui Wang,^1,2,* Yu Duan,^1,3 Jonathan Lee Yang,^1,6 Shaun Tan,¹ Yonghai Yuan,⁴ Yu Huang,¹ and Yang Yang^1,7,*

单位：

¹Department of Materials Science and Engineering and California NanoSystems Institute, University of California Los Angeles,   Los Angeles, CA 90095, USA

²Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China

³State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China

⁴Solargiga Energy Holdings Limited, Hong Kong 999077, China

摘要：

To increase the commercial prospects of metal halide perovskite solar cells, there is a need for simple, cost-effective, and generalized approaches that mitigate their intrinsic thermal instability. Here we show that 1,3,7 trimethylxanthine, a commodity chemical with two conjugated carboxyl groups better known by its common name caffeine, improves the performance and thermal stability of perovskite solar cells based on both MAPbI₃ and CsFAMAPbI₃ active layers. The strong interaction between caffeine and Pb²⁺ ions serves as a ‘‘molecular lock’’ that increases the activation energy during film crystallization, delivering a perovskite film with preferred orientation, improved electronic properties, reduced ion migration, and greatly enhanced thermal stability. Planar n-i-p solar cells based on caffeine-incorporated pure MAPbI₃ perovskites, which are notoriously unstable, exhibit a champion stabilized efficiency of 19.8% and retain over 85% of their efficiency under continuous annealing at 85℃ in nitrogen.

影响因子：

暂无

分区情况：

暂无

链接：

https://doi.org/10.1016/j.joule.2019.04.005

责任编辑：朱文昌