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Fabrication and performance studies of TiO 2 and Porphyrin Heterojunction based organic photodetector

AGUS SUPRIYANTO1,2,* , KUWAT TRIYANA2, ROTO3, KUSMINARTO2, M. M. SALLEH4, A. A. UMAR4

Affiliation

  1. Department of Physics, Sebelas Maret University, 57126 Surakarta, Indonesia
  2. Department of Physics, Gadjah Mada University, 55281 Yogyakarta, Indonesia
  3. Department of Chemistry, Gadjah Mada University, 55281 Yogyakarta, Indonesia
  4. Institute of Microengineering and Nanoelectronics (IMEN) Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia

Abstract

Organic photodetector of TiO 2/Porphyrin has been fabricated and its performance has been tested in dark and under various illumination of light intensity from 20 to 100 mWcm -2 . Four samples of porphyrin films have been used in the device, namely 1, 3, 5 and 7 times spin coating. TiO 2 films were deposited onto ITO covered glass substrate by controlled hydrolysis technique assisted with spin coating technique. Then porphyrin film was deposited on TiO 2 using spin coating technique. The films of TiO 2 /porphyrin has absorbance maximum at 660 nm, which is in the red region. An aluminium electrode was prepared on top of porphyrin films by electron beam evaporation technique. The device shows rectification behaviour in the dark and shows photosensitization effect under illumination of visible lights. The device with 3 times spin coating of porphyrin shows the highest Jsc of 1.02 μAcm-2 and V oc of 520 mV..

Keywords

Photodetector, Photosensitizing, Porphyrin, TiO2.

Submitted at: Nov. 2, 2009
Accepted at: Nov. 19, 2009

Citation

AGUS SUPRIYANTO, KUWAT TRIYANA, ROTO, KUSMINARTO, M. M. SALLEH, A. A. UMAR, Fabrication and performance studies of TiO 2 and Porphyrin Heterojunction based organic photodetector, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 11, pp. 1760-1764 (2009)