Transparent image sensors using an organic multilayer photodiode

Hideyuki Tanaka, Takeshi Yasuda, Katsuhiko Fujita, Tetsuo Tsutsui

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


The feasibility of transparent photodetector composed of a well-aligned perylenetetra carboxylic-bis-benzimidazole (PTCBI) and a non-aligned titanyl phthalocyanine (TiOPc) layer for image sensing, was investigated. A large dichroic ratio of optical absorption was obtained at the peak wavelength of 540 nm. It was observed that linear polarization of incident light changes to elliptic polarization when linearly polarized light passes through a uniaxially aligned PTCBI layer. The use of the thin PTCBI layer is also effective for avoiding the self-absorption effect. The transparent photodetector was placed on black or white paper with the Indium Tin Oxide (ITO) electrode side touching the paper. A successful white and black detection using both green (540 nm) and red (730 nm) light indicates the possibility of reading color images using photodiodes when the photoconductivity at the blue spectral region could be enhanced.

Original languageEnglish
Pages (from-to)2230-2233
Number of pages4
JournalAdvanced Materials
Issue number17
Publication statusPublished - Sep 5 2006

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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