Unconventional Route to Oxygen-Vacancy-Enabled Highly Efficient Electron Extraction and Transport in Perovskite Solar Cells

Bing Wang; Meng Zhang; Xun Cui; Zewei Wang; Matthew Rager; Yingkui Yang; Zhigang Zou; Zhong Lin Wang; Zhiqun Lin

doi:10.1002/anie.201910471

Unconventional Route to Oxygen-Vacancy-Enabled Highly Efficient Electron Extraction and Transport in Perovskite Solar Cells

Bing Wang, Meng Zhang, Xun Cui, Zewei Wang, Matthew Rager, Yingkui Yang, Zhigang Zou, Zhong Lin Wang, Zhiqun Lin

Department of Chemistry & Nanoscience

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

124 Scopus citations

Abstract

The ability to effectively transfer photoexcited electrons and holes is an important endeavor toward achieving high-efficiency solar energy conversion. Now, a simple yet robust acid-treatment strategy is used to judiciously create an amorphous TiO₂ buffer layer intimately situated on the anatase TiO₂ surface as an electron-transport layer (ETL) for efficient electron transport. The facile acid treatment is capable of weakening the bonding of zigzag octahedral chains in anatase TiO₂, thereby shortening staggered octahedron chains to form an amorphous buffer layer on the anatase TiO₂ surface. Such amorphous TiO₂-coated ETL possesses an increased electron density owing to the presence of oxygen vacancies, leading to efficient electron transfer from perovskite to TiO₂. Compared to pristine TiO₂-based devices, the perovskite solar cells (PSCs) with acid-treated TiO₂ ETL exhibit an enhanced short-circuit current and power conversion efficiency.

Original language	English
Pages (from-to)	1611-1618
Number of pages	8
Journal	Angewandte Chemie - International Edition
Volume	59
Issue number	4
DOIs	https://doi.org/10.1002/anie.201910471
State	Published - 20 Jan 2020

Bibliographical note

Funding Information:
This work is supported by National Science Foundation (ECCS 1914562). B.W. gratefully acknowledges the financial support from the China Scholarship Council, the National Natural Science Foundations of China (21603098, 51673061).

Publisher Copyright:
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

acid treatment
amorphous materials
electron transporting layers
oxygen vacancies
perovskite solar cells

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10.1002/anie.201910471

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title = "Unconventional Route to Oxygen-Vacancy-Enabled Highly Efficient Electron Extraction and Transport in Perovskite Solar Cells",

abstract = "The ability to effectively transfer photoexcited electrons and holes is an important endeavor toward achieving high-efficiency solar energy conversion. Now, a simple yet robust acid-treatment strategy is used to judiciously create an amorphous TiO2 buffer layer intimately situated on the anatase TiO2 surface as an electron-transport layer (ETL) for efficient electron transport. The facile acid treatment is capable of weakening the bonding of zigzag octahedral chains in anatase TiO2, thereby shortening staggered octahedron chains to form an amorphous buffer layer on the anatase TiO2 surface. Such amorphous TiO2-coated ETL possesses an increased electron density owing to the presence of oxygen vacancies, leading to efficient electron transfer from perovskite to TiO2. Compared to pristine TiO2-based devices, the perovskite solar cells (PSCs) with acid-treated TiO2 ETL exhibit an enhanced short-circuit current and power conversion efficiency.",

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AU - Rager, Matthew

AU - Yang, Yingkui

AU - Zou, Zhigang

AU - Wang, Zhong Lin

AU - Lin, Zhiqun

N1 - Funding Information: This work is supported by National Science Foundation (ECCS 1914562). B.W. gratefully acknowledges the financial support from the China Scholarship Council, the National Natural Science Foundations of China (21603098, 51673061). Publisher Copyright: © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

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N2 - The ability to effectively transfer photoexcited electrons and holes is an important endeavor toward achieving high-efficiency solar energy conversion. Now, a simple yet robust acid-treatment strategy is used to judiciously create an amorphous TiO2 buffer layer intimately situated on the anatase TiO2 surface as an electron-transport layer (ETL) for efficient electron transport. The facile acid treatment is capable of weakening the bonding of zigzag octahedral chains in anatase TiO2, thereby shortening staggered octahedron chains to form an amorphous buffer layer on the anatase TiO2 surface. Such amorphous TiO2-coated ETL possesses an increased electron density owing to the presence of oxygen vacancies, leading to efficient electron transfer from perovskite to TiO2. Compared to pristine TiO2-based devices, the perovskite solar cells (PSCs) with acid-treated TiO2 ETL exhibit an enhanced short-circuit current and power conversion efficiency.

AB - The ability to effectively transfer photoexcited electrons and holes is an important endeavor toward achieving high-efficiency solar energy conversion. Now, a simple yet robust acid-treatment strategy is used to judiciously create an amorphous TiO2 buffer layer intimately situated on the anatase TiO2 surface as an electron-transport layer (ETL) for efficient electron transport. The facile acid treatment is capable of weakening the bonding of zigzag octahedral chains in anatase TiO2, thereby shortening staggered octahedron chains to form an amorphous buffer layer on the anatase TiO2 surface. Such amorphous TiO2-coated ETL possesses an increased electron density owing to the presence of oxygen vacancies, leading to efficient electron transfer from perovskite to TiO2. Compared to pristine TiO2-based devices, the perovskite solar cells (PSCs) with acid-treated TiO2 ETL exhibit an enhanced short-circuit current and power conversion efficiency.

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Unconventional Route to Oxygen-Vacancy-Enabled Highly Efficient Electron Extraction and Transport in Perovskite Solar Cells

Abstract

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Keywords

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