Comparison of electrical and luminescence data for the A center in CdTe
We have investigated the electrical and optical properties of the deep levels responsible for the 1.4-1.5 eV luminescence band usually observed in II-VI compounds. We compared the energy levels found by cathodoluminescence and junction spectroscopy methods for semi-insulating (CdTe:Cl and Cd_(0.8)Zn...
| Autores: | , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 1997 |
| País: | España |
| Recursos: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/59204 |
| Acesso em linha: | https://hdl.handle.net/20.500.14352/59204 |
| Access Level: | acceso abierto |
| Palavra-chave: | 538.9 Cadmium Telluride Transient Spectroscopy Point-Defects Deep Levels Crystals Cathodoluminescence Cd_(1-x)Zn_xTe Detectors Cl Física de materiales |
| Resumo: | We have investigated the electrical and optical properties of the deep levels responsible for the 1.4-1.5 eV luminescence band usually observed in II-VI compounds. We compared the energy levels found by cathodoluminescence and junction spectroscopy methods for semi-insulating (CdTe:Cl and Cd_(0.8)Zn_(0.2)Te) and semiconducting samples (undoped CdTe). The techniques utilized were deep level transient spectroscopy (DLTS) on semiconducting samples and photoinduced current transient spectroscopy and photo-DLTS on high resistivity materials. These last two techniques are complementary and allow the determination of the trap character (donor/acceptor). Three acceptor levels are seen in the electrical transient data at E(upsilon)+0.12, 0.14, and 0.16 eV with hole capture cross sections of 2x10^(-16), 1x10(-16), and 4X10^(-17) cm(2), respectively. The lowest level is seen only in Cl doped material corroborating the literature optical and electron spin resonance identification of a level at E_(upsilon)+0.12 eV as being a V_Cd+Cl_Te, donor-acceptor pair center. All three levels may be present in the 1.4 eV luminescence band. |
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