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 $\frac{m_c}{m_0}=0.079\mathrm{}\pm 0.001$ and Luttinger parameters ${\gamma }_1^L=5.15\mathrm{}\pm 0.05$, ${\gamma }_2^L=0.94\mathrm{}\pm 0.03$, and ${\gamma }_3^L=1.62\mathrm{}\pm 0.03$. The direct observation of the split-off valence-band-to-conduction-band transition gives ${\Delta }_0=0.108\mathrm{}\pm 0.003$ eV and an approximate effective mass of $\frac{m_{\mathrm{so}}}{m_0}=0.21\mathrm{}\pm 0.02$.