Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4939744
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Funding
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Connaught Global Challenge Fund of the University of Toronto
- National Natural Science Foundation of China
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Organo-metal halide perovskites have recently emerged as a highly promising class of semiconductors for optoelectronic device applications. Integrating these hybrid materials within organic molecular thin film devices is key to fabricate functional devices. By evaporating ultra-thin films of organic semiconductor on thermally evaporated CH3NH3PbI3 and using in-situ ultraviolet photoemission spectroscopy, we directly measure the interfacial energy offset between CH3NH3PbI3 valence band maximum and the highest occupied molecular orbital for 5 different archetypal organic semiconductors. It is found that the energy offsets scale linearly as a function of the ionization energies of the organic semiconductors. The experimental data are in excellent agreement with a theoretical model for ideal semiconductor heterojunctions. (C) 2016 AIP Publishing LLC.
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