期刊
CHEMSUSCHEM
卷 14, 期 6, 页码 1524-1533出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202002831
关键词
defect engineering; stability; halide perovskites; solar cells; surface chemistry
资金
- Singapore National Research Foundation through the Intra-CREATE Collaborative Grant [NRF2018-ITC001-001]
- Singapore National Research Foundation through Energy Innovation Research Program [NRF2015EWT-EIRP003-004, CRP: S18-1176-SCRP]
- Singapore National Research Foundation through Competitive Research Program [NRF-CRP14-2014-03]
Passivation with alkylammonium alkanoate can significantly reduce recombination losses and improve open-circuit voltage, leading to higher power conversion efficiencies. The unencapsulated device retains 85% of its initial PCE after treatment, while the standard 3D perovskite device loses 50% of its original PCE after exposure to ambient environment for 1500 hours.
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.
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