• Elhadidy, H.
• Sochinskii, N. V.
• Saucedo, E.
• Franc, J.
• Horodysky, P.
• Bermúdez, V.
• Ruiz, C. M.

Abstract

Combining optical (low temperature photoluminescence), electrical (thermoelectric effect spectroscopy), and structural (synchrotron X-ray powder diffraction) methods, the defect structure of CdTe doped with Bi was studied in crystals with dopant concentration in the range of 1017–1019 at./cm3. The semi-insulating state observed in crystals with low Bi concentration is assigned to the formation of a shallow donor level and a deep donor recombination center. Studying the evolution of lattice parameter with temperature, we postulate that the deep center is formed by a Te–Te dimer and their formation is explained by a tetrahedral to octahedral distortion, due to the introduction of Bi in the CdTe lattice. We also shows that this model agrees with the electrical, optical, and transport charge properties of the samples. ; This work has been partly supported by the projects CAM SENSORCDT S-0505/MAT/0209, CAM FOTOFLEX S-0505/ENE-123, and EU FP6 PHOLOGIC 017158. The authors are grateful to the European Synchrotron Radiation Facility (ESRF) for the experiments HS-3183 and HS-3184 and to Dr. German Castro. E.S. also thanks to the MEC of Spain for the fellowship FPU 2003-1388. ; Peer reviewed

Topics

• impedance spectroscopy
• compound
• photoluminescence
• x-ray diffraction
• experiment
• defect
• defect structure
• II-VI semiconductor
• Bismuth
• Cadmium