Optical and capacitance spectroscopy of InP:Fe

Abstract
Photocapacitance, DLTS, optical absorption and photoluminescence data are presented for iron- and iron-germanium-doped Czochralski single-crystal InP. The results demonstrate that the Fe2+ to Fe+ transition is not present within the InP band gap. A feature observed in photocapacitance and optical DLTS is attributed to the presence of the Fe4+ charge state, and features associated with the well known Fe3+ and Fe2+ states also occur. Photoluminescence measurements show an iron-related band near 0.5 eV, not previously reported in the literature.