Electrical effects of subgrain boundaries, twins, dislocations, and Te precipitation on long-wavelength IR HgCdTe photodiode arrays

R. Scott List; John H. Tregilgas; Arthur M. Turner; Jeffrey D. Beck; John C. Ehmke

doi:10.1117/12.179667

13 July 1994 Electrical effects of subgrain boundaries, twins, dislocations, and Te precipitation on long-wavelength IR HgCdTe photodiode arrays

R. Scott List, John H. Tregilgas, Arthur M. Turner, Jeffrey D. Beck, John C. Ehmke

Author Affiliations +

Proceedings Volume 2228, Producibility of II-VI Materials and Devices; (1994) https://doi.org/10.1117/12.179667
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

HgCdTe crystals have a high density of intrinsic material defects generated either during the growth process itself or subsequent annealing steps. An understanding of the relationships between these material imperfections and the electrical performance of long-wavelength infrared (LWIR) HgCdTe photodiodes provides guidance in the choice of the growth technique and subsequent processing to minimize electrically detrimental defects. It also sets limits of material perfection required to achieve a specified performance level. Understandings of these relationships have been gained for subgrain boundaries, twins, dislocations, and Te precipitation in LWIR HgCdTe n-on-p photodiodes. Measurements of bias dependent dark current, responsivity, and noise as functions of defect density were performed on both arrays and test structures. This paper emphasizes the direct relationship between material defects and array performance. Wherever possible, the reader is referred to more detailed discussions. All the diodes reported in this study were planar, ion implanted structures using vacancy doped material. All reported measurements were taken at 77 K.

Citation Download Citation

R. Scott List, John H. Tregilgas, Arthur M. Turner, Jeffrey D. Beck, and John C. Ehmke "Electrical effects of subgrain boundaries, twins, dislocations, and Te precipitation on long-wavelength IR HgCdTe photodiode arrays", Proc. SPIE 2228, Producibility of II-VI Materials and Devices, (13 July 1994); https://doi.org/10.1117/12.179667

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