Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 87, Issue 1-4, Pages 567-573Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2004.07.039
Keywords
pentacene; schottky diode; excitons
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Aluminium/pentacene Schottky diodes have been fabricated on glass substrates. An ohmic, transparent front contact was prepared by sputtering a highly conductive indium-tin-oxide layer. The pentacene layer was evaporated in high vacuum of a pure (98%) commercially available source. All the samples were grown at room temperature and moderate deposition rates (< 10 angstrom/s). Optical measurements evidence absorption peaks at energy positions 1.86, 1.97, 2.13, 2.3 and 2.5 eV, corresponding to singlet states of the lowest unoccupied molecular orbital of pentacene. The current-voltage characteristics show good rectifying behaviours. Finally, a clear antibatic response is observed in the external quantum efficiency of the photodiodes when illuminated through the indium-tin-oxide contact. (c) 2004 Elsevier B.V. All rights reserved.
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