Optical band gap of Cd3P2-Zn3P2 semiconductor solid solutions

Abstract

Absorptivity of (ZnxCd1-x)3P2 solid solutions with x = 0.66, 0, 75, 0.91, and 1.0 has been measured. The absorption coefficient has been calculated by means of the model which takes into account the correction for optical losses on the surface and volume imperfections. Energy positions of the fundamental absorption edge (optical band gap E0) have been established for different x and a variation of E0 with x has been found to be described by the formula E0(x. 300 K) = 0, 564 + 1.43x -0.497x2 (eV). Finally, a brief discussion on the band structure of (ZnxCd1-x)3P2 alloys has been given. © 1985 The Institute of Physics.