Photoconductivity Mechanism in Beta-Carotene Glass

Abstract

Photoconductivity spectra are measured on beta-carotene glass consisting of a mixture of isomers using a sandwich type cell and a surface type cell. In the sandwich cell, the different spectra are obtained by the polarity of the illuminating electrode. When the illuminating electrode is positive, it is concluded that the origin of the photoconductivity spectra in the wavelength below 400 nm is hole photoinjection from the electrode. The photoconductivity band is found in the wavelength 600∼800 nm, and the origin of the band is suggested to be intrinsic.