Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 11, Pages 12848-12857Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c02536
Keywords
Perovskite solar cell; passivation; efficiency; stability; cyclohexylethylamine
Funding
- National Natural Science Foundation of China [21771066, 61804058, 21773246, 21403176]
- Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University [ZQN-706]
- Opening Project of PCOSS, Xiamen University [202014]
- Youth Innovation Foundation of Xiamen City [3502Z20206083]
- Cultivation Program for Postgraduate in Scientific Research Innovation Ability of Huaqiao University [18013081018]
- Natural Science Foundation of Fujian Province [2019J01123]
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The introduction of the stabilizing molecule CHEA improves the stability and efficiency of perovskite optoelectronic devices by reducing defect sites and improving crystallinity through the formation of Lewis adducts. The stability and performance of PSCs are enhanced, with the power conversion efficiency significantly improved from 18.05% to 21.53% by optimizing the concentration of CHEA.
Perovskite solar cells (PSCs) are one of the most prominent photovoltaic technologies, yet their stability, scalability, and engineering at the molecular level remain challenging. Herein, we report a facile strategy that can simultaneously enhance the stability and efficiency of perovskite optoelectronic devices. In particular, we introduce a passivation molecule, cyclohexylethylamine (CHEA), whose amine group can effectively reduce the number of defect sites and improve the crystallinity of the perovskite by forming Lewis adducts with undercoordinated Pb2+ ions in the perovskite. Upon passivation by CHEA, the stability and performance of PSCs are correspondingly improved. By optimizing the concentration of CHEA, the power conversion efficiency of the device has been significantly improved from 18.05 to 21.53%.
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