OAM-RC

Abstract

Vacuum sublimed thin films of gallium phthalocyanine chloride were prepared at room temperature onto glass substrates at a base pressure of 10-5 Torr. Annealing was done in air and vacuum and the effect of annealing temperature on the electrical, optical and structural properties were studied. Arrhenius plot yields thermal activation energy in the intrinsic region and impurity scattering region. The variation in the electrical properties with thickness was also studied and activation energy was determined. The activation energy E1 corresponds to intrinsic region decreases as the thickness increases. Optical absorption spectra of films annealed at temperatures 348 K, 398 K, 448 K and 498 K were taken over a wavelength range of 300 to 900 nm and the optical energy band gap Eg and the onset energy gap were calculated. It is found that Eg decreases with annealing temperature. The novel finding in the present work is that the Soret band shows a red shift with the increase of annealing temperature. X-ray diffraction pattern was used to find the nano-crystalline grain size using Scherrer formula and an increase in grain size with annealing temperature was observed.

Keywords

Gallium phthalocyanine chloride, Thin films, X-ray diffraction, Optical properties, Electrical properties.

Citation

S. MATHEW, C. SUDARSANAKUMAR, C. S. MENON, Optical, electrical and structural characterization of gallium phthalocyanine chloride thin films, Optoelectronics and Advanced Materials - Rapid Communications, 1, 11, November 2007, pp.614-619 (2007).

Submitted at: Oct. 11, 2007

Accepted at: Oct. 31, 2007