Lead methylammonium triiodide perovskite-based solar cells: An interfacial charge-transfer investigation

Xiaobao Xu, Hua Zhang, Kun Cao, Jin Cui, Jianfeng Lu, Xianwei Zeng, Yan Shen, Mingkui Wang

Research output: Contribution to journalArticleResearchpeer-review

44 Citations (Scopus)

Abstract

This work reports on an investigation into interfacial charge transfer in CH3NH3PbI3 perovskite solar cells by using anatase TiO2 nanocuboids enclosed by active {100} and {001} facets. The devices show 6.0 and 8.0% power conversion efficiency with and without hole-transport material. Transient photovoltage/photocurrent decay and charge extraction, as well as impedance spectroscopy measurements, reveal that carbon materials are effective counter electrodes in perovskite solar cells. The photogenerated charges are observed to be stored in mesoporous TiO2 film under illumination and in the CH3NH3PbI3 layer in the dark. The use of 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spirobifluorene (spiro-MeOTAD) as a hole-transport material accelerates interfacial charge recombination between the photogenerated electrons and holes.

Original languageEnglish
Pages (from-to)3088-3094
Number of pages7
JournalChemSusChem
Volume7
Issue number11
DOIs
Publication statusPublished - 1 Nov 2014
Externally publishedYes

Keywords

  • Carbon
  • Electrochemistry
  • Kinetics
  • Perovskite phases
  • Solar cells

Cite this