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 journalArticlepeer-review

166 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
Pages (from-to)31491-31499
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number46
DOIs
StatePublished - 23 Nov 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

Funding

A.K. and D.C. thank the US-Israel Binational Science Foundation (Jerusalem) for partial support. Work at Princeton University was further supported by a grant of the National Science Foundation (DMR-1005892). P.S. and J.A.C. were supported by the hybrid perovskite solar cell program of the National Center for Photovoltaics funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Office of Solar Energy Technology under Award DE-AC36-08GO28308DOE with the National Renewable Energy Laboratory (NREL). The Weizmann Institute authors also thank the Leona M. Harry B. Helmsley Charitable Trust, the Israel National Nano-Initiative, the Israel Ministry of Science, and the Nancy Stephen Grand Center for Sensors Security for support. E.M.S. was supported by a NASA Space Technology Research Fellowship.

FundersFunder number
Israel Ministry of Science
Nancy Stephen Grand Center for Sensors Security
National Center for Photovoltaics
Office of Solar Energy TechnologyDE-AC36-08GO28308DOE
National Science FoundationDMR-1005892
U.S. Department of Energy
National Aeronautics and Space Administration
Office of Energy Efficiency and Renewable Energy
National Renewable Energy Laboratory
Leona M. and Harry B. Helmsley Charitable Trust
United States-Israel Binational Science Foundation

    Keywords

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

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