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Water‐Resistant and Flexible Perovskite Solar Cells via a Glued Interfacial Layer
Author(s) -
Huang Zengqi,
Hu Xiaotian,
Liu Cong,
Meng Xiangchuan,
Huang Zhandong,
Yang Jia,
Duan Xiaopeng,
Long Juan,
Zhao Zhipeng,
Tan Licheng,
Song Yanlin,
Chen Yiwang
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201902629
Subject(s) - materials science , perovskite (structure) , passivation , energy conversion efficiency , layer (electronics) , photovoltaic system , flexible electronics , transfer printing , chemical engineering , adhesive , flexible display , optoelectronics , nanotechnology , composite material , electrical engineering , thin film transistor , engineering
Perovskite solar cells (PVSCs) are promising photovoltaic technologies for realizing power sources with outstanding power conversion efficiency (PCE) and low‐cost properties. However, the extraordinary photovoltaic performance can be maximized only if an extremely stabilized device structure is developed. Here, a novel glued poly(ethylene‐ co ‐vinyl acetate) (EVA) interfacial layer is introduced to fabricate highly efficient and stable PVSCs with excellent waterproofness and flexibility. This strategy can effectively passivate the perovskite surface, reduce defect density, and balance charge transfer, which leads to a champion PCE of 19.31% for a 0.1 cm 2 device and 11.73% for a 25 cm 2 solar module. More importantly, the formation of a glued EVA thin layer on the surface of perovskite can inhibit ionic migration to the Ag electrode, form favorable interfacial contact and adhesive interaction with the perovskite/[6,6]‐phenyl‐C 61 ‐butyric acid methyl ester to sustain mechanical bending, and produce significant waterproofness from moisture invasion, thus facilitating improvement in the operational stability of the PVSCs. The EVA‐treated PVSCs exhibit superior PCE values of 15.12% for a flexible device (0.1 cm 2 ) and 8.95% for a flexible module (25 cm 2 ), as well as over 85% retention after 5000 bending cycles, which opens up a new strategy for the practical application of PVSCs in portable and wearable electronics.