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Analysis of charge-transfer and charge-conserving optical transitions at vanadium ions in CdTe

MPG-Autoren
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Selber,  Heiko
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

Peka,  P.
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schulz,  Hans-Joachim
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Zitation

Selber, H., Peka, P., Biernacki, S. W., Schulz, H.-J., Schwarz, R., & Benz, K. W. (1999). Analysis of charge-transfer and charge-conserving optical transitions at vanadium ions in CdTe. Semiconductor Science and Technology, 14(6), 521-527. doi:10.1088/0268-1242/14/6/306.


Zitierlink: https://hdl.handle.net/21.11116/0000-0006-43A9-0
Zusammenfassung
In addition to the V3+ features earlier identified, photoluminescence (PL) excitation and sensitization spectra support the assignment of infrared PL bands to internal transitions of V+ and V2+ in vanadium-doped CdTe. The measured decay time constants of the PL bands conform to the electric-dipole selection rules. Crystal-field calculations applying a Tanabe-Sugano scheme support the assignment of excited states. In addition to the charge-conserving transitions of vanadium ions in their various oxidation states, charge-transfer transitions are present in the spectra. A comparative analysis of intrinsic defect levels reveals that they are not involved in the experimental spectra. From the excitation and sensitization spectra, the positions of the V/V3+ donor (ECB-7550 cm-1) and V2+/V+ acceptor (ECB-4800 cm-1) levels in CdTe are determined.