期刊
NANO ENERGY
卷 95, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107036
关键词
Perovskite solar cells; 2D perovskite; Surface passivation; Trifluoromethyl; Stability; High efficiency
类别
资金
- National Natural Science Foundation of China [21872080]
- State Key Laboratory of Power System and Generation Equipment [SKLD21Z03, SKLD20M03]
- China Postdoctoral Science Foundation [043240004]
- Young Talents Thousand Program
This article discusses the design of a multifunctional trap deactivating reagent that effectively eliminates deep level metallic lead traps in perovskite optoelectronics. It shows improved device performance and stability.
As a deep level trap in perovskite, metallic lead (Pb-0) greatly deteriorates the performances of perovskite optoelectronics such as perovskite solar cells. Here, we designed 2-trifluoromethyl-phenylethylamine hydroiodide (2-CF3-PEAI) to serve as a multifunctional trap deactivating reagent which can react with metallic lead to eliminate deep level Pb0 traps, forming a thin layer of 2D perovskite (2-CF3-PEA)(2)PbI4 atop the 3D perovskite without impediment of charge carrier transport. Moreover, functional groups in 2-CF3-PEAI can deactivate variety of traps in perovskite by multiple interactions, i.e. coordination between I- and Pb2+, hydrogen bond between CF3 and formamidine, ionic interaction between NH3+ group and lead halide anion etc. Thus, non radiative recombination was dramatically inhibited. The surface coverage of hydrophobic thin 2D perovskite (2-CF3-PEA)(2)PbI4 layer impedes the diffusion of metal (from anode) and humidity (from the environment) to 3D perovskite, leading to improved device stabilities. As a result, a 23.17% power conversion efficiency was achieved and an enhanced T80 (~850 h) was obtained under continuous light-soaking without encapsulation, 121 times longer than that of the untreated devices.
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