TITLE

Correlation between photoelectric and optical absorption spectra of thermally evaporated pentacene films

AUTHOR(S)
Jiyoul Lee; S. S. Kim; Kibum Kim; Jae Hoon Kim, B. G.; Seongil Im
PUB. DATE
March 2004
SOURCE
Applied Physics Letters;3/8/2004, Vol. 84 Issue 10, p1701
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have measured the spectral photoresponse of Al/pentacene Schottky junction photodiodes and optical absorption spectra of pentacene films thermally evaporated on glass. The photoelectric response exhibited the genuine highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) transition at 1.97 eV and interband absorption peaks at 2.3 and 2.5 eV. These peaks are also identified in the optical absorption spectra, but they are dominated by additional strong exciton peaks at 1.82 and 2.1 eV. By comparing these complementary measurements, we determine the HOMO–LUMO gap energy of 1.97 eV and the fundamental exciton binding energy of 0.15 eV for thin solid pentacene. © 2004 American Institute of Physics.
ACCESSION #
12405716

 

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