CuPt-type ordering in In/sub 0.5/Ga/sub 0.5/P probed by photovoltage spectroscopy in semiconductor-electrolyte system

We show the usefulness of the photovoltage (PV) spectroscopy in the semiconductor-electrolyte system for probing the electronic effects of the ordering. We compare photo-e.m.f. spectra measured for an electrolyte Schottky contact made on InGaP layers with different degree of order, to results obtained by using other spectroscopy techniques, namely, photoluminescence (PL) and planar photoconductivity (PC) measurements.