High-work-function molybdenum oxide hole extraction contacts in hybrid organic-inorganic perovskite solar cells

Philip Schulz, Jan O. Tiepelt, Jeffrey A. Christians, Igal Levine, Eran Edri, Erin M. Sanehira, Gary Hodes, David Cahen, Antoine Kahn

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

We investigate the effect of high work function contacts in halide perovskite absorber-based photovoltaic devices. Photoemission spectroscopy measurements reveal that band bending is induced in the absorber by the deposition of the high work function molybdenum trioxide (MoO3). We find that direct contact between MoO3 and the perovskite leads to a chemical reaction, which diminishes device functionality. Introducing an ultrathin spiro-MeOTAD buffer layer prevents the reaction, yet the altered evolution of the energy levels in the methylammonium lead iodide (MAPbI3) layer at the interface still negatively impacts device performance.

Original languageEnglish (US)
Pages (from-to)31491-31499
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number46
DOIs
StatePublished - Nov 23 2016

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • band offsets
  • charge carrier transport
  • electronic structures/processes/mechanisms
  • hybrid materials
  • photoemission spectroscopy
  • photovoltaic devices

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    Schulz, P., Tiepelt, J. O., Christians, J. A., Levine, I., Edri, E., Sanehira, E. M., Hodes, G., Cahen, D., & Kahn, A. (2016). High-work-function molybdenum oxide hole extraction contacts in hybrid organic-inorganic perovskite solar cells. ACS Applied Materials and Interfaces, 8(46), 31491-31499. https://doi.org/10.1021/acsami.6b10898