Dynamics of photoconductivity in organic TPD films

K. Shimakawa, Nazrul Anuar Nayan, K. Yonezawa, T. Sato

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The steady state photoconductivity in disordered tri-methylphenyl diamine (TPD) films has been studied at relatively high temperatures (200 - 300 K). Hopping transport of holes occurs through localized centers with a Gaussian energy distribution. The steady state photoconductivity is proportional to Gγexp[-(σ/(kT)2/2] (with y γ ≈ 0.5) where G is the number of absorbed photons and σ (= 0.067 eV) is the standard deviation of the Gaussian distribution. We have formulated the hopping photoconductivity and reasonable physical parameters, such as the hopping relaxation time, recombination time, and diffusion coefficient (and hence mobility) of the charge carriers, are estimated for the TPD films. The photoconductivity increases upon exposure to air and this is a reversible effect.

Original languageEnglish
Pages (from-to)65-69
Number of pages5
JournalJournal of Optoelectronics and Advanced Materials
Volume9
Issue number1
Publication statusPublished - Jan 2007
Externally publishedYes

Fingerprint

Diamines
Photoconductivity
diamines
photoconductivity
Gaussian distribution
Charge carriers
normal density functions
Relaxation time
charge carriers
standard deviation
energy distribution
Photons
diffusion coefficient
relaxation time
air
photons
Air
Temperature

Keywords

  • Bimolecular recombination
  • Exposing air
  • Hopping of photocarriers
  • Organic TPD films
  • Photoconductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)

Cite this

Dynamics of photoconductivity in organic TPD films. / Shimakawa, K.; Nayan, Nazrul Anuar; Yonezawa, K.; Sato, T.

In: Journal of Optoelectronics and Advanced Materials, Vol. 9, No. 1, 01.2007, p. 65-69.

Research output: Contribution to journalArticle

Shimakawa, K. ; Nayan, Nazrul Anuar ; Yonezawa, K. ; Sato, T. / Dynamics of photoconductivity in organic TPD films. In: Journal of Optoelectronics and Advanced Materials. 2007 ; Vol. 9, No. 1. pp. 65-69.
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