Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4922804
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Funding
- NASA Virginia Space Grant Consortium New Investigator Award
- NSF I/UCRC program
- NASA Langley Research Center through Langley Professor program
- IRAD
- NSF [DMR-9503304, CHE-1048600]
- Department of Mechanical Engineering and Material Science at the University of Pittsburgh
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Temperature dependent energy levels of methylammonium lead iodide are investigated using a combination of ultraviolet photoemission spectroscopy and optical spectroscopy. Our results show that the valence band maximum and conduction band minimum shift down in energy by 110 meV and 77 meV as temperature increases from 28 degrees C to 85 degrees C. Density functional theory calculations using slab structures show that the decreased orbital splitting due to thermal expansion is a major contribution to the experimentally observed shift in energy levels. Our results have implications for solar cell performance under operating conditions with continued sunlight exposure and increased temperature. (C) 2015 AIP Publishing LLC.
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