Vitreous Bi–Se Layers as Near-Infrared Photodetectors

Abstract

The infrared photodetecting properties of new vitreous Bi–Se films are described. Such films are prepared by coevaporation and vapor quenching. A room‐temperature D* value of 2×10¹¹ cm/W·sec^1/2 was measured at the peak sensitivity wavelength (∼1 μ) for an optimum composition film. Response times range between 0.3 and 3 msec. In addition, measurements were made of D* as a function of sample composition, incident photon flux, and temperature.