The spectral photoresponse of Al/pentacene Schottky junction photodiodes and optical absorption spectra of pentacene films thermally evaporated on glass were measured. The photoelectric response exhibited the genuine highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) transition at 1.97 eV. It was shown that the interband absorption peaks were identified in the optical absorption spectra. The HOMO-LUMO gap energy of 1.97 eV and the fundamental exciton binding energy of 0.15 eV for thin solid pentacene were determined by comparing the complementary measurements.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)