Temperature evolution of exciton absorptions in Cd1-xZnxTe materials

Manuel A. Quijada; Ross Henry

doi:10.1117/12.735604

17 September 2007 Temperature evolution of exciton absorptions in Cd_1-xZn_xTe materials

Manuel A. Quijada, Ross Henry

Proceedings Volume 6692, Cryogenic Optical Systems and Instruments XII; 669206 (2007) https://doi.org/10.1117/12.735604
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

These studies consist of measuring the frequency dependent transmittance (T(ω)) and reflectance (R(ω)) above and below the optical band-gap in the UV/Visible and infrared frequency ranges for Cd_1-xZn_xTe materials for x=0 and x=0.04. Measurements were also done in the temperature range from 5 to 300 K. The results show that the optical gap near 1.49 eV at 300 K increases to 1.62 eV at 5 K. Finally, we observe sharp absorption peaks near this gap energy at low temperatures for the x=0.04 sample. The close proximity of these peaks to the optical transition threshold suggests that they originate from the creation of bound electron-hole pairs or excitons. The decay of these excitonic absorptions may contribute to a photoluminescence and transient background response of these back-illuminated HgCdTe CCD detectors.

Citation Download Citation

Manuel A. Quijada and Ross Henry "Temperature evolution of exciton absorptions in Cd_1-xZn_xTe materials", Proc. SPIE 6692, Cryogenic Optical Systems and Instruments XII, 669206 (17 September 2007); https://doi.org/10.1117/12.735604

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