Enhanced electronic transport in Fe3+-doped TiO2 for high efficiency perovskite solar cells

Xiangling Gu, Yafei Wang, Ting Zhang, Detao Liu, Rui Zhang, Peng Zhang, Jiang Wu, Zhi David Chen, Shibin Li

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

Oxygen vacancies in non-stoichiometric TiO2 electron transport layers can capture injected electrons and act as recombination centers. In this study, the compact TiO2 electron transport layers of perovskite solar cells (PSCs) are doped with different molar ratios of Fe3+ in order to passivate such defects and improve their electron transport properties. The electrical conductivity, absorption, crystal structure, and the performance of the PSCs are systematically studied. It shows that Fe3+-doping improves the conductivity of TiO2 compact layers compared with the pristine TiO2, boosting the photovoltaic performance of PSCs. The reduced trap-filled limit voltage (VTFL) of the Fe3+-doped TiO2 compact layers suggests that trap density in the Fe3+-TiO2 films is much lower than that of a pristine TiO2 film. With the optimized doping concentration (1 mol%) of Fe3+, the best power conversion efficiency of PSCs is improved from 16.02% to 18.60%.

Original languageEnglish
Pages (from-to)10754-10760
Number of pages7
JournalJournal of Materials Chemistry C
Volume5
Issue number41
DOIs
StatePublished - 2017

Bibliographical note

Publisher Copyright:
© 2017 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Materials Chemistry

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