Journal
APPLIED PHYSICS LETTERS
Volume 80, Issue 16, Pages 2872-2874Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1471929
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We report on the optical and luminescence properties of pentacene films deposited on n-Si by thermal evaporation at room temperature, 40, 60, 80, and 120 degreesC. Ellipsometric spectra of the films deposited at room temperature and 60 degreesC exhibited a main absorption peak at 1.82 eV and additional weak features at higher energy levels. Photoluminescence spectra taken at room temperature revealed band-to-exciton and band-to-acceptor transitions at 1.7 and 1.76 eV, respectively. An electroluminescence band was also observed near 1.65 eV under a forward bias from p-pentacene/n-Si diodes which show strong rectifying behavior. (C) 2002 American Institute of Physics.
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