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Chromium contamination in VPE InP from photoconductivity spectra

Chromium contamination in VPE InP from photoconductivity spectra

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A photoconductivity study has been made of nominally undoped VPE n-InP materials grown on semi-insulating InP:Fe substrates. The photoresponse spectra obtained indicate features characteristic of Cr deep acceptors. By comparing the magnitudes of the photoresponse with that of a back-doped InP:Cr reference sample, the concentration has been estimated at between 2 and 8×1014 cm−3.

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