Pentacene-based photodiode with Schottky junction

Jiyoul Lee, D. K. Hwang, C. H. Park, S. S. Kim, Seongil Im

Research output: Contribution to journalConference article

32 Citations (Scopus)

Abstract

We have fabricated a metal/organic semiconductor Schottky photodiode based on Al/pentacene junction. Since the energy band gap of thin solid pentacene was determined to be 1.82 eV, as characterized by direct absorption spectroscopy, we measured spectral photoresponses on our Schottky photodiode in the monochromatic light illumination range of 325-650 nm applying a reverse bias of -2 V. The main features of photo-response spectra were found to shift from those of direct absorption spectra toward higher photon energies. It is because the direct absorption spectra mainly show exciton level peaks rather than the true highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gaps while the photo-response spectra clearly represents the true HOMO-LUMO gap. Our photo-response spectra reveal 1.97 eV as the HOMO-LUMO gap.

Original languageEnglish
Pages (from-to)12-15
Number of pages4
JournalThin Solid Films
Volume451-452
DOIs
Publication statusPublished - 2004 Mar 22
EventProceedings of Symposium D on Thin Film and Nano-Structured - Strasbourg, France
Duration: 2003 Jun 102003 Jun 13

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Molecular orbitals
Photodiodes
photodiodes
molecular orbitals
Absorption spectra
absorption spectra
Semiconducting organic compounds
organic semiconductors
Absorption spectroscopy
Excitons
Band structure
energy bands
pentacene
absorption spectroscopy
Energy gap
Photons
Lighting
Metals
illumination
excitons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Lee, Jiyoul ; Hwang, D. K. ; Park, C. H. ; Kim, S. S. ; Im, Seongil. / Pentacene-based photodiode with Schottky junction. In: Thin Solid Films. 2004 ; Vol. 451-452. pp. 12-15.
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Pentacene-based photodiode with Schottky junction. / Lee, Jiyoul; Hwang, D. K.; Park, C. H.; Kim, S. S.; Im, Seongil.

In: Thin Solid Films, Vol. 451-452, 22.03.2004, p. 12-15.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Pentacene-based photodiode with Schottky junction

AU - Lee, Jiyoul

AU - Hwang, D. K.

AU - Park, C. H.

AU - Kim, S. S.

AU - Im, Seongil

PY - 2004/3/22

Y1 - 2004/3/22

N2 - We have fabricated a metal/organic semiconductor Schottky photodiode based on Al/pentacene junction. Since the energy band gap of thin solid pentacene was determined to be 1.82 eV, as characterized by direct absorption spectroscopy, we measured spectral photoresponses on our Schottky photodiode in the monochromatic light illumination range of 325-650 nm applying a reverse bias of -2 V. The main features of photo-response spectra were found to shift from those of direct absorption spectra toward higher photon energies. It is because the direct absorption spectra mainly show exciton level peaks rather than the true highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gaps while the photo-response spectra clearly represents the true HOMO-LUMO gap. Our photo-response spectra reveal 1.97 eV as the HOMO-LUMO gap.

AB - We have fabricated a metal/organic semiconductor Schottky photodiode based on Al/pentacene junction. Since the energy band gap of thin solid pentacene was determined to be 1.82 eV, as characterized by direct absorption spectroscopy, we measured spectral photoresponses on our Schottky photodiode in the monochromatic light illumination range of 325-650 nm applying a reverse bias of -2 V. The main features of photo-response spectra were found to shift from those of direct absorption spectra toward higher photon energies. It is because the direct absorption spectra mainly show exciton level peaks rather than the true highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gaps while the photo-response spectra clearly represents the true HOMO-LUMO gap. Our photo-response spectra reveal 1.97 eV as the HOMO-LUMO gap.

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U2 - 10.1016/j.tsf.2003.10.086

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JF - Thin Solid Films

SN - 0040-6090

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