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Title: Effects of all-organic interlayer surface modifiers on the efficiency and stability of perovskite solar cells
Authors: Foong, Joseph Japheth Yeow Wan
Febriansyah, Benny
Rana, Prem Jyoti Singh
Koh, Teck Ming
Tay, Darrell Jun Jie
Bruno, Annalisa
Mhaisalkar, Subodh Gautam
Mathews, Nripan
Keywords: Engineering::Materials
Issue Date: 2021
Source: Foong, J. J. Y. W., Febriansyah, B., Rana, P. J. S., Koh, T. M., Tay, D. J. J., Bruno, A., Mhaisalkar, S. G. & Mathews, N. (2021). Effects of all-organic interlayer surface modifiers on the efficiency and stability of perovskite solar cells. ChemSusChem, 14(6), 1524-1533.
Project: NRF2018-ITC001-001
Journal: ChemSusChem
Abstract: 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.
ISSN: 1864-5631
DOI: 10.1002/cssc.202002831
Schools: School of Materials Science and Engineering 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Research Techno Plaza 
Rights: © 2021 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:ERI@N Journal Articles
IGS Journal Articles
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