Photovoltaic effect and interband magneto-optical transitions in InP

Abstract

A study is made of the oscillatory spectral distribution of the photovoltaic (PV) effect of a gold-indium phosphide Schottky barrier in magnetic fields of up to 70 kG. Spectra are obtained for both the direct and wavelength-modulated PV signals, the latter being compared to the wavelength-modulated reflectivity data. The spectra are taken at 4.2 K in the Faraday configuration for both circular polarizations. The transition energies associated with the spectral oscillations are corrected for exciton-binding effects, and are analyzed as Landau levels in terms of the Pidgeon and Brown coupled-bands theory of interband magnetoabsorption. The fit to the data gives a conduction-band effective mass $\frac{{m}_{c}}{{m}_{0}}=0.079\ifmmode\pm\else\textpm\fi{}0.001$ and Luttinger parameters ${\ensuremath{\gamma}}_{1}^{L}=5.15\ifmmode\pm\else\textpm\fi{}0.05$, ${\ensuremath{\gamma}}_{2}^{L}=0.94\ifmmode\pm\else\textpm\fi{}0.03$, and ${\ensuremath{\gamma}}_{3}^{L}=1.62\ifmmode\pm\else\textpm\fi{}0.03$. The direct observation of the split-off valence-band-to-conduction-band transition gives ${\ensuremath{\Delta}}_{0}=0.108\ifmmode\pm\else\textpm\fi{}0.003$ eV and an approximate effective mass of $\frac{{m}_{\mathrm{so}}}{{m}_{0}}=0.21\ifmmode\pm\else\textpm\fi{}0.02$.