Copper,the dominant acceptor in refined,undoped zinc telluride |
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Authors: | PJ Dean |
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Institution: | Royal Signals and Radar Establishment, Malvern, Worcs., WR 14 3PS, UK |
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Abstract: | Comparative measurements have been made of optical absorption and photoluminescence of refined undoped and Cu in-diffused ZnTe single crystals. Strong increases in a bound exciton BE line near 2.375 eV previously identified with the electrically dominant point defect acceptor ‘a’, with binding energy EA ? 149 meV, suggests that this acceptor is substitutional CuZn. Similarly strong increases in a relatively broad band at slightly higher energy suggests the simultaneous incorporation of shallow donors, possibly interstital CuI. These findings indicate that intrinsic defects such as VZn neither control the Fermi level in refined ZnTe nor produce shallow acceptors with EA ? 250 meV, contrary to much previous speculation. |
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