Embedding of WO3 nanocrystals with rich oxygen-vacancies in solution processed perovskite film for improved photovoltaic performance

Hang Guo, Pengfei Guo, Xiaokun Yang, Jin Zhang, Huiwu Yu, Wenhao Zhao, Qian Ye, Hongyue Wang, Hongqiang Wang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Seeking strategies of promoting the charge separation and transport of the photo-active layer has been always of significance for the development of high-performance optoelectronic devices. We herein demonstrate an effective way of decorating WO3 nanocrystals in perovskite films for boosted photogenerated carriers transport. The WO3 nanocrystals are generated by a simple technique of pulsed laser irradiation in liquid, then introduced into the perovskite film based on the anti-solvent approach. Such decoration is found helpful for the increase of the short-circuit current density (Jsc) of the device, which leads to the increase of the photoconversion efficiency (PCE) from 17.72% to 19.29%. The improved PCE is mainly due to the decoration of the WO3 at the grain boundaries of perovskite films that facilitates the charge transport between the adjacent grains, which is evidenced by the quenching of the film photoluminescence, shortened carrier lifetime, and increased carrier mobility. We thus believe our study provides an effective way of embedding ordinary metal oxides in perovskite films for enhanced optoelectronic performance.

Original languageEnglish
Article number228175
JournalJournal of Power Sources
Volume461
DOIs
StatePublished - 15 Jun 2020

Keywords

  • Charge transport
  • Hybrid perovskite solar cell
  • Oxygen-vacancy
  • Pulsed laser irradiation in liquid
  • WO nanocrystals

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