Effect of gamma ray and high-energy oxygen ion radiation on electrical and optical properties of MCT epitaxial layers

S. Sitharaman; D. Kanjilal; S. K. Arora; S. K. Ganguly; Anjana Nagpal; Madhukar Gautam; R. Raman; Shiv Kumar; V. R. Prakash; S. C. Gupta

doi:10.1117/12.368353

4 November 1999 Effect of gamma ray and high-energy oxygen ion radiation on electrical and optical properties of MCT epitaxial layers

S. Sitharaman, D. Kanjilal, S. K. Arora, S. K. Ganguly, Anjana Nagpal, Madhukar Gautam, R. Raman, Shiv Kumar, V. R. Prakash, S. C. Gupta

Author Affiliations +

Proceedings Volume 3890, Fourth International Conference on Material Science and Material Properties for Infrared Optoelectronics; (1999) https://doi.org/10.1117/12.368353
Event: Material Science and Material Properties for Infrared Optoelectronics, 1998, Kiev, Ukraine

Abstract

Hg_1-xCd_xTe epitaxial layers grown from Te-rich solution have been exposed to Gamma ray radiation up to 650 Grey using Co⁶⁰ and high energy oxygen radiation at 100Mev. The electrical resistivity, carrier density and Hall mobility values at 77K and IR transmission at 300K have been measured in n,p and compensated epilayers both before and after irradiation. These properties are very much affected by these radiations. In the uncompensated p-type epitaxial layers both types of radiation produced an increase in extrinsic carrier density and a corresponding decrease in Hall mobility. It is observed that both types of radiation have significant effect on the compensated layers and the degree of compensation is greatly reduced by the oxygen irradiation. The 100 Mev oxygen irradiation produced an apparent shift in the bandgap towards shorter wavelength and the absorption below the energy gap is reduced as shown by FTIR measurements, whereas Gamma ray radiation up to the dose 650 Grey did not have any effect on optical properties. These results show the ability of oxygen radiation to passivate the activity of residual impurities or defects.

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S. Sitharaman, D. Kanjilal, S. K. Arora, S. K. Ganguly, Anjana Nagpal, Madhukar Gautam, R. Raman, Shiv Kumar, V. R. Prakash, and S. C. Gupta "Effect of gamma ray and high-energy oxygen ion radiation on electrical and optical properties of MCT epitaxial layers", Proc. SPIE 3890, Fourth International Conference on Material Science and Material Properties for Infrared Optoelectronics, (4 November 1999); https://doi.org/10.1117/12.368353

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