Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4826116
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- Faculty of Science of the Kasetsart University
- Thai Government
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Layers of CH3NH3PbI3 are investigated by modulated surface photovoltage spectroscopy (SPV) during heating in vacuum. As prepared CH3NH3PbI3 layers behave as a p-type doped semiconductor in depletion with a band gap of 1.5 eV. After heating to 140 degrees C the sign of the SPV signals of CH3NH3PbI3 changed concomitant with the appearance of a second band gap at 2.36 eV ascribed to PbI2, and SPV signals related to charge separation from defect states were reduced after moderate heating. (c) 2013 AIP Publishing LLC.
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