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Published online by Cambridge University Press: 22 February 2011
By correlating the results of photoreflectance, photoconductivity, photoluminescence, and differential-Hall and photo-Hall measurements with the stoichiometry, for a number of undoped single crystal samples, we could conclude two donor levels (35 meV, 70 meV) and three acceptor levels (100 meV, 155 meV, 170 meV) distributed in the forbidden ga.p for undoped CuInS2 samples.