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Effects of All‐Organic Interlayer Surface Modifiers on the Efficiency and Stability of Perovskite Solar Cells
Author(s) -
Joseph Yeow Wan Foong Japheth,
Febriansyah Benny,
Jyoti Singh Rana Prem,
Ming Koh Teck,
Jun Jie Tay Darrell,
Bruno Annalisa,
Mhaisalkar Subodh,
Mathews Nripan
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202002831
Subject(s) - passivation , perovskite (structure) , halide , materials science , energy conversion efficiency , layer (electronics) , open circuit voltage , chemical engineering , photovoltaic system , nanotechnology , chemistry , inorganic chemistry , optoelectronics , voltage , organic chemistry , ecology , physics , quantum mechanics , engineering , biology
Surface imperfections created during fabrication of halide perovskite (HP) films could induce formation of various defect sites that affect device performance and stability. In this work, all‐organic surface modifiers consisting of alkylammonium cations and alkanoate anions are introduced on top of the HP layer to passivate interfacial vacancies and improve moisture tolerance. Passivation using alkylammonium alkanoate does not induce formation of low‐dimensional perovskites species. Instead, the organic species only passivate the perovskite's surface and grain boundaries, which results in enhanced hydrophobic character of the HP films. In terms of photovoltaic application, passivation with alkylammonium alkanoate allows significant reduction in recombination losses and enhancement of open‐circuit voltage. Alongside unchanged short‐circuit current density, power conversion efficiencies of more than 18.5 % can be obtained from the treated sample. Furthermore, the unencapsulated device retains 85 % of its initial PCE upon treatment, whereas the standard 3D perovskite device loses 50 % of its original PCE when both are subjected to ambient environment over 1500 h.