Surface Electronic Modification of Perovskite Thin Film with Water‐Resistant Electron Delocalized Molecules for Stable and Efficient Photovoltaics

Although the efficiency of perovskite solar cells (PSCs) is close to crystalline silicon solar cells, the instability of perovskite, especially in humid condition, still hinders its commercialization. As an effective method to improve their stability, surface functionalization, by using hydrophobic...

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Bibliographic Details
Published in:Advanced energy materials 2018-05, Vol.8 (13), p.n/a
Main Authors: Wen, Tian Yu, Yang, Shuang, Liu, Peng Fei, Tang, Li Juan, Qiao, Hong Wei, Chen, Xiao, Yang, Xiao Hua, Hou, Yu, Yang, Hua Gui
Format: Article
Language:English
Subjects:
Charge transfer
Commercialization
delocalization
Efficiency
Electrical insulation
Energy conversion efficiency
functionalization
Interface stability
perovskite
Perovskites
Photovoltaic cells
Solar cells
Stability
Surface stability
Water resistance
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Summary:Although the efficiency of perovskite solar cells (PSCs) is close to crystalline silicon solar cells, the instability of perovskite, especially in humid condition, still hinders its commercialization. As an effective method to improve their stability, surface functionalization, by using hydrophobic molecules, has been extensively investigated, but usually accompanied with the loss of device efficiencies owing to their intrinsic electrical insulation. In this work, for the first time, it is demonstrated that 3‐alkylthiophene‐based hydrophobic molecules can be used as both water‐resistant and interface‐modified layers, which could simultaneously enhance both stability and performance significantly. Benefitting from their unique structures of thiophene rings, the π‐electrons are highly delocalized and thus enhance the charge transfer and collection at the interface. The device based on 3‐hexylthiophene treatment exhibits a champion energy conversion efficiency of 19.89% with a dramatic 10% enhancement compared with the pristine one (18.08%) of Cs0.05 FA0.81 MA0.14 PbBr0.45 I2.55‐based PSCs. More importantly, the degradation of the long‐term efficiency of unsealed device is less than 20% in Cs0.05 FA0.81 MA0.14 PbBr0.45I2.55‐based PSCs after more than 700 h storage in air. This finding provides an avenue for further improvement of both the efficiency and stability of PSCs. 3‐alkylthiophene derivatives are utilized as the multifunctional layer in perovskite solar cells for the first time, which demonstrates a power conversion efficiency of 19.89% with superb long‐term stability. Optimized carrier migration and enhanced surface water resistance are responsible for the high performance and stability of the resulting devices.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201703143