Photoconductivity measurements in lead phthalocyanine thin films

被引：10

作者：

Ambily, S ^{[1
]}

Xavier, FP

Menon, CS

机构：

[1] Indian Inst Technol, Bombay 76, Maharashtra, India

[2] Loyola Inst Frontier Energy, Chennai 34, India

[3] Mahatma Gandhi Univ, Sch Pure & Appl Phys, Kottayam 686560, Kerala, India

来源：

MATERIALS LETTERS | 1999年 / 41卷 / 01期

关键词：

thin films; phthalocyanines; photoconductivity; energy level;

D O I：

10.1016/S0167-577X(99)00094-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Lead phthalocyanine thin films (PbPc) were prepared by vacuum sublimation under a pressure of 10(-5) Torr. Photoconductive studies as a function of applied voltage, intensity of incident light, temperature and wavelength were carried out. Photocurrent spectra as a function of wavelength indicate peaks around 1.54, 1.98, 2.4, 3.0 and 3.48 eV. These are interpreted as transitions at critical points. From the temperature dependence of photoconductivity measurements, the activation energies 0.074 and 0.46 eV were obtained and 0.68 and 0.46 eV for dark conductivity. The dependence of the intensity of photocurrent yields a slope of m = 0.6, in the photoconductivity equation I(ph) proportional to (In)(m). An energy level diagram is drawn for lead phthalocyanine thin films from the photoresponse studies. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：5 / 8

页数：4

共 6 条

[1] Electrical conductivity, optical absorption and structural studies of thin films of lead phthalocyanine [J].