"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Synthesis and photocapacitive studies of Cu(II) 5,10,15,20-tetrakis(4′-isopropylphenyl) porphyrin

M. SALEEM1, M. H. SAYYAD1,* , K. S. KARIMOV1,2, Z. AHMAD1, M. SHAH1, M. YASEEN3, I. KHOKHAR3, M. ALI4

Affiliation

  1. GIK Institute of Engineering Sciences and Technology, Topi, District Swabi, N.W.F.P. 23640, Pakistan
  2. Physical Technical institute of Academy of Sciences, Rudaki Ave, 33, Dushanbe 734025, Tajikistan
  3. Institute of Chemistry, University of the Punjab, Lahore 54000, Pakistan
  4. Government College of Science, Wahdat Road, Lahore, Pakistan

Abstract

An organic semiconductor Cu(II) 5,10,15,20-tetrakis(4′-isopropylphenyl) porphyrin (CuTIPP) was synthesized and investigated as an active material in photocapacitive detectors. Thin films of the CuTIPP were deposited by thermal evaporator on a glass substrate with preliminary deposited metal electrodes and Al/CuTIPP/Al and Ag/CuTIPP/Ag surface type photocapacitive detectors were fabricated. Thickness of the CuTIPP films was equal to 100 nm in both detectors. Area of the semiconducting channel between metallic electrodes was equal to 40 μm × 15 mm. It was observed that under filament lamp illumination of up to 4000 lx the capacitance of the Al/CuTIPP/Al and Ag/CuTIPP/Ag photocapacitive detectors increased by 2.6 and 2.2 times, respectively, with respect to the dark conditions. The photoconductivity of the detectors increased with illumination as well. It is assumed that the photocapacitive response of the detectors is associated with polarization occurring due to the transfer of photo-generated electrons and holes. The equivalent circuit of the photocapacitive detectors is presented. Data obtained by simulation showed reasonable matching with experimental results..

Keywords

Organic semiconductor, Cu(II) 5,10,15,20-tetrakis(4′-isopropylphenyl) porphyrin (CuTIPP), Detector, Surface-type photocapacitor, Polarization, Photoconductivity.

Submitted at: April 14, 2008
Accepted at: June 9, 2008

Citation

M. SALEEM, M. H. SAYYAD, K. S. KARIMOV, Z. AHMAD, M. SHAH, M. YASEEN, I. KHOKHAR, M. ALI, Synthesis and photocapacitive studies of Cu(II) 5,10,15,20-tetrakis(4′-isopropylphenyl) porphyrin, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 6, pp. 1468-1472 (2008)