Abstract
We report well-resolved structure in the neutral donor bound exciton “two-electron” transition photoluminescence satellites from selected relatively pure, nominally undoped single crystals of InP grown by the liquid encapsulated Czochralski (LEC) technique. This structure results from transitions at different donor species, adequately resolvable only in spectra recorded at high magnetic fields and low temperatures. Three or four donors appear. Sulphur is usually a significant species, Si is a minor donor, and an unidentified species is a principal donor which has a small negative central cell correction. These data contrast strongly with those for InP layers grown by the halide and metal organic vapour epitaxial techniques in which the dominant residual donors are S and Si, respectively.
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