Abstract
Optical absorption measurements on n-InP samples of several electron concentrations (10 15-10 19 cm −3) have been made as a function of hydrostatic pressure up to about 100 kbar at 77 K, using a diamond-anvil cell and a modified gasket system. With increasing pressure the absorption spectra shift towards the higher energies. This corresponds to the rise in the Γ 1 c minimum of the conduction band relative to the top of the valence band: the direct gap increases. The absorption spectrum shows a low-energy tail starting at about 80 kbar for pure InP. This indicates the onset of the indirect optical transition. The pressure dependence of the absorption edge in heavily doped samples is different from those in undoped or moderately doped samples in the high pressure range. The observed behavior can be explained by considering the pressure dependence of the Fermi level.
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