Optical Absorption and Photoconductivity in Liquid Selenium

Publisher Website
Google Scholar
Abstract
The optical absorption and photoconductivity is measured in liquid selenium. Urbach's spectral rule is satisfied and explained with the Dow and Redfield model. The optical gap is close to 1.8 eV at 230 °C and its temperature dependence is 8 × 10−4 eV/K. Optical absorption and quantum efficiency curves are not energy shifted in contrast to amorphous selenium. The low energy photogeneration is due to a “dynamically”‐assisted separation of electron–hole pairs. Two lifetimes are found and the shorter is related to the structural relaxation. The values of photoconduction and conduction gaps are about 1.8 eV in agreement with the optical result but the Fermi level must be shifted towards the valence band.

This publication has 23 references indexed in Scilit: