Evidence for hydrogen-transition-metal complexes in as-grown indium phosphide

Abstract

Indium phosphide single crystals doped with transition metal impurities display sharp optical absorption lines around 2300 cm -1. Each line seems to be characteristic of a specific transition metal impurity. The behaviour of these lines as a function of temperature suggests that they are of vibrational nature rather than of electronic one. These lines are attributed to the vibrational mode of a P-H bond; the hydrogen is a nearest neighbour to the transition metal impurity. In this way, the “chemical shift” of the line is characteristic of the transition metal impurity.