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

Research output: Contribution to journalArticlepeer-review

110 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 languageEnglish
Pages (from-to)1611-1618
Number of pages8
JournalAngewandte Chemie - International Edition
Volume59
Issue number4
DOIs
StatePublished - 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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