Achieving over 21% efficiency in inverted perovskite solar cells by fluorinating a dopant-free hole transporting material

Li Wan; Wenxiao Zhang; Sheng Fu; Lijun Chen; Yueming Wang; Zhongyuan Xue; Youtian Tao; Wenjun Zhang; Weijie Song; Junfeng Fang

doi:10.1039/d0ta00522c

Achieving over 21% efficiency in inverted perovskite solar cells by fluorinating a dopant-free hole transporting material

Li Wan
, Wenxiao Zhang
, Sheng Fu
, Lijun Chen
, Yueming Wang
, Zhongyuan Xue
, Youtian Tao
, Wenjun Zhang^*
, Weijie Song
, Junfeng Fang

^*Corresponding author for this work

East China Normal University
CAS - Ningbo Institute of Material Technology and Engineering
Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

75 Scopus citations

Abstract

Hole transporting materials (HTMs) play a critical role in ameliorating the performance of perovskite solar cells (PSCs). Dedicated HTMs can improve not only the hole extraction and efficiency but also the stability. Herein, PFDT-COOH and its fluorinated derivative, PFDT-2F-COOH, are introduced as dopant-free HTMs for inverted PSCs. Compared to PFDT-COOH, PFDT-2F-COOH exhibits a deeper highest occupied molecular orbital (HOMO) level, a higher work function on indium tin oxide electrodes, and an elevated built-in potential in the device. The PFDT-COOH device based on FA_1-xMA_xPbI₃ mixed-cation perovskite exhibits a champion power conversion efficiency (PCE) of 20.64%, while the PFDT-2F-COOH device exhibits a champion PCE of 21.68%, which is close to the highest value (21.7%) attained in inverted single-junction PSCs. The elevated efficiency is attributed to reduction of carrier recombination and enhancement of carrier extraction via the fluorination strategy. In addition, the two devices also show excellent operational and thermal stabilities. Therefore, our work offers a feasible strategy for preparing high efficiency and stable inverted PSCs.

Original language	English
Pages (from-to)	6517-6523
Number of pages	7
Journal	Journal of Materials Chemistry A
Volume	8
Issue number	14
DOIs	https://doi.org/10.1039/d0ta00522c
State	Published - 14 Apr 2020
Externally published	Yes

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10.1039/d0ta00522c

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title = "Achieving over 21\% efficiency in inverted perovskite solar cells by fluorinating a dopant-free hole transporting material",

abstract = "Hole transporting materials (HTMs) play a critical role in ameliorating the performance of perovskite solar cells (PSCs). Dedicated HTMs can improve not only the hole extraction and efficiency but also the stability. Herein, PFDT-COOH and its fluorinated derivative, PFDT-2F-COOH, are introduced as dopant-free HTMs for inverted PSCs. Compared to PFDT-COOH, PFDT-2F-COOH exhibits a deeper highest occupied molecular orbital (HOMO) level, a higher work function on indium tin oxide electrodes, and an elevated built-in potential in the device. The PFDT-COOH device based on FA1-xMAxPbI3 mixed-cation perovskite exhibits a champion power conversion efficiency (PCE) of 20.64\%, while the PFDT-2F-COOH device exhibits a champion PCE of 21.68\%, which is close to the highest value (21.7\%) attained in inverted single-junction PSCs. The elevated efficiency is attributed to reduction of carrier recombination and enhancement of carrier extraction via the fluorination strategy. In addition, the two devices also show excellent operational and thermal stabilities. Therefore, our work offers a feasible strategy for preparing high efficiency and stable inverted PSCs.",

author = "Li Wan and Wenxiao Zhang and Sheng Fu and Lijun Chen and Yueming Wang and Zhongyuan Xue and Youtian Tao and Wenjun Zhang and Weijie Song and Junfeng Fang",

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T1 - Achieving over 21% efficiency in inverted perovskite solar cells by fluorinating a dopant-free hole transporting material

AU - Wan, Li

AU - Zhang, Wenxiao

AU - Fu, Sheng

AU - Chen, Lijun

AU - Wang, Yueming

AU - Xue, Zhongyuan

AU - Tao, Youtian

AU - Zhang, Wenjun

AU - Song, Weijie

AU - Fang, Junfeng

PY - 2020/4/14

Y1 - 2020/4/14

N2 - Hole transporting materials (HTMs) play a critical role in ameliorating the performance of perovskite solar cells (PSCs). Dedicated HTMs can improve not only the hole extraction and efficiency but also the stability. Herein, PFDT-COOH and its fluorinated derivative, PFDT-2F-COOH, are introduced as dopant-free HTMs for inverted PSCs. Compared to PFDT-COOH, PFDT-2F-COOH exhibits a deeper highest occupied molecular orbital (HOMO) level, a higher work function on indium tin oxide electrodes, and an elevated built-in potential in the device. The PFDT-COOH device based on FA1-xMAxPbI3 mixed-cation perovskite exhibits a champion power conversion efficiency (PCE) of 20.64%, while the PFDT-2F-COOH device exhibits a champion PCE of 21.68%, which is close to the highest value (21.7%) attained in inverted single-junction PSCs. The elevated efficiency is attributed to reduction of carrier recombination and enhancement of carrier extraction via the fluorination strategy. In addition, the two devices also show excellent operational and thermal stabilities. Therefore, our work offers a feasible strategy for preparing high efficiency and stable inverted PSCs.

AB - Hole transporting materials (HTMs) play a critical role in ameliorating the performance of perovskite solar cells (PSCs). Dedicated HTMs can improve not only the hole extraction and efficiency but also the stability. Herein, PFDT-COOH and its fluorinated derivative, PFDT-2F-COOH, are introduced as dopant-free HTMs for inverted PSCs. Compared to PFDT-COOH, PFDT-2F-COOH exhibits a deeper highest occupied molecular orbital (HOMO) level, a higher work function on indium tin oxide electrodes, and an elevated built-in potential in the device. The PFDT-COOH device based on FA1-xMAxPbI3 mixed-cation perovskite exhibits a champion power conversion efficiency (PCE) of 20.64%, while the PFDT-2F-COOH device exhibits a champion PCE of 21.68%, which is close to the highest value (21.7%) attained in inverted single-junction PSCs. The elevated efficiency is attributed to reduction of carrier recombination and enhancement of carrier extraction via the fluorination strategy. In addition, the two devices also show excellent operational and thermal stabilities. Therefore, our work offers a feasible strategy for preparing high efficiency and stable inverted PSCs.

UR - https://www.scopus.com/pages/publications/85083073846

U2 - 10.1039/d0ta00522c

DO - 10.1039/d0ta00522c

M3 - 文章

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SN - 2050-7488

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SP - 6517

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JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 14

ER -

Achieving over 21% efficiency in inverted perovskite solar cells by fluorinating a dopant-free hole transporting material

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