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

Here, 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 (MoO 3). We find that direct contact between MoO 3 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 (MAPbI 3) layer at the interface still negatively impacts device performance.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [4] ;  [4] ;  [2]
  1. Princeton Univ., Princeton, NJ (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Princeton Univ., Princeton, NJ (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  4. Weizmann Institute of Science, Rehovot (Israel)
  5. Weizmann Institute of Science, Rehovot (Israel); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Washington, Seattle, WA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 1944-8244
Grant/Contract Number:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 8; Journal Issue: 46; Journal ID: ISSN 1944-8244
American Chemical Society (ACS)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
Country of Publication:
United States
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; band offsets; charge carrier transport; electronic structures/processes/mechanisms; hybrid materials; photoemission spectroscopy; photovoltaic devices
OSTI Identifier: