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Interfacial benzenethiol modification facilitates charge transfer and improves stability of cm-sized metal halide perovskite solar cells with up to 20 % efficiency

Abstract

Metal halide perovskite solar cells (PSC) exhibit outstanding power conversions efficiencies when fabricated as mm-sized devices, but creation of high-performing large-area PSCs that are stable under operating conditions on a sufficiently long timescale still presents a significant challenge. We demonstrate herein that modification of the interface between the perovskite and spiro-OMeTAD hole-transporting material with commercially available para-substituted benzenthiol molecules facilitates fabrication of cm-sized PSCs with both improved efficiency and stability. Comprehensive analysis using specialised and conventional physical characterisation techniques has been undertaken to demonstrate that band alignment at the perovskite surface can be tuned to improve the solar cell efficiency via adsorption of benzenethiols with a significant dipole moment. Moreover, modification of the perovskite with cyano-substituted benzenethiol enhances charge extraction and reduces charge recombination in the devices. These effects enable improvements in the power conversion efficiency of PSCs from 19.0 to 20.2 % and from 18.5 to 19.6 % under 1 sun AM 1.5G irradiation with 0.16 and 1.00 cm2 aperture, respectively. Most importantly, benzenethiol-modified perovskite solar cells retain more than 80 % of the initial performance after 185 h of continuous operation at 50 % relative humidity and 50 °C device temperature under 1 sun irradiation, while devices with no interfacial modification undergo continuous deterioration down to 35 % of the initial efficiency. These significant improvements are provided by a very simple and perfectly reproducibile modification procedure that can be readily adopted in other types of PSCs.

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Publication details

The article was received on 13 Mar 2018, accepted on 24 Apr 2018 and first published on 24 Apr 2018


Article type: Paper
DOI: 10.1039/C8EE00754C
Citation: Energy Environ. Sci., 2018, Accepted Manuscript
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    Interfacial benzenethiol modification facilitates charge transfer and improves stability of cm-sized metal halide perovskite solar cells with up to 20 % efficiency

    J. Lu, X. Lin, X. Jiao, T. R. Gengenbach, A. D. Scully, L. Jiang, B. Tan, J. Sun, B. Li, N. Pai, U. bach, A. N. Simonov and Y. Cheng, Energy Environ. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8EE00754C

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