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

Jianfeng Lu, Xiongfeng Lin, Xuechen Jiao, Thomas Gengenbach, Andrew D. Scully, Liangcong Jiang, Boer Tan, Jingsong Sun, Bin Li, Narendra Pai, Udo Bach, Alexandr N. Simonov, Yi-Bing Cheng

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Metal halide perovskite solar cells (PSC) exhibit outstanding power conversion 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 a spiro-OMeTAD hole-transporting material with commercially available para-substituted benzenethiol 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 apertures, 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 highly reproducibile modification procedure that can be readily adopted in other types of PSCs.

Original languageEnglish
Pages (from-to)1880-1889
Number of pages10
JournalEnergy & Environmental Science
Volume11
Issue number7
DOIs
Publication statusPublished - 1 Jul 2018

Cite this

Lu, Jianfeng ; Lin, Xiongfeng ; Jiao, Xuechen ; Gengenbach, Thomas ; Scully, Andrew D. ; Jiang, Liangcong ; Tan, Boer ; Sun, Jingsong ; Li, Bin ; Pai, Narendra ; Bach, Udo ; Simonov, Alexandr N. ; Cheng, Yi-Bing. / Interfacial benzenethiol modification facilitates charge transfer and improves stability of cm-sized metal halide perovskite solar cells with up to 20% efficiency. In: Energy & Environmental Science. 2018 ; Vol. 11, No. 7. pp. 1880-1889.
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abstract = "Metal halide perovskite solar cells (PSC) exhibit outstanding power conversion 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 a spiro-OMeTAD hole-transporting material with commercially available para-substituted benzenethiol 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 apertures, 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 highly reproducibile modification procedure that can be readily adopted in other types of PSCs.",
author = "Jianfeng Lu and Xiongfeng Lin and Xuechen Jiao and Thomas Gengenbach and Scully, {Andrew D.} and Liangcong Jiang and Boer Tan and Jingsong Sun and Bin Li and Narendra Pai and Udo Bach and Simonov, {Alexandr N.} and Yi-Bing Cheng",
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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. / Lu, Jianfeng; Lin, Xiongfeng; Jiao, Xuechen; Gengenbach, Thomas; Scully, Andrew D.; Jiang, Liangcong; Tan, Boer; Sun, Jingsong; Li, Bin; Pai, Narendra; Bach, Udo; Simonov, Alexandr N.; Cheng, Yi-Bing.

In: Energy & Environmental Science, Vol. 11, No. 7, 01.07.2018, p. 1880-1889.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Interfacial benzenethiol modification facilitates charge transfer and improves stability of cm-sized metal halide perovskite solar cells with up to 20% efficiency

AU - Lu, Jianfeng

AU - Lin, Xiongfeng

AU - Jiao, Xuechen

AU - Gengenbach, Thomas

AU - Scully, Andrew D.

AU - Jiang, Liangcong

AU - Tan, Boer

AU - Sun, Jingsong

AU - Li, Bin

AU - Pai, Narendra

AU - Bach, Udo

AU - Simonov, Alexandr N.

AU - Cheng, Yi-Bing

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N2 - Metal halide perovskite solar cells (PSC) exhibit outstanding power conversion 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 a spiro-OMeTAD hole-transporting material with commercially available para-substituted benzenethiol 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 apertures, 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 highly reproducibile modification procedure that can be readily adopted in other types of PSCs.

AB - Metal halide perovskite solar cells (PSC) exhibit outstanding power conversion 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 a spiro-OMeTAD hole-transporting material with commercially available para-substituted benzenethiol 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 apertures, 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 highly reproducibile modification procedure that can be readily adopted in other types of PSCs.

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U2 - 10.1039/c8ee00754c

DO - 10.1039/c8ee00754c

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