Investigation of multi-stack quantum dots-in-double-well infrared detectors

M. N. Kutty; Y. D. Sharma; A. Barve; J. Shao; E. Plis; R. V. Shenoi; S. Krishna; S. J. Lee; S. K. Noh

doi:10.1117/12.827070

9 September 2009 Investigation of multi-stack quantum dots-in-double-well infrared detectors

M. N. Kutty, Y. D. Sharma, A. Barve, J. Shao, E. Plis, R. V. Shenoi, S. Krishna, S. J. Lee, S. K. Noh

Proceedings Volume 7467, Nanophotonics and Macrophotonics for Space Environments III; 74670V (2009) https://doi.org/10.1117/12.827070
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

We report on the performance of multi-stack quantum dots in a well (DWELL) detectors. Present-day QD detectors are limited by low responsivity and quantum efficiency (QE). This can be attributed to the low absorption efficiency of these structures due to the small number of QD stacks in the detector. In this paper we examine the effect of the number of stacks on the performance of the detector. In particular, we investigate the InAs/GaAs/AlGaAs D-DWELL (Dots-in-double-well) design, which has a lower strain per DWELL stack than the InAs/InGaAs/GaAs DWELLs thereby enabling the growth of many more stacks in the detector. The purpose of the study detailed in this paper is to examine the effects of varying the number of stacks in the InAs/InGaAs/GaAs/AlGaAs D-DWELL detector, on its device performance. The numbers of stacks grown using solid source molecular beam epitaxy (MBE), were 15, 30, 40, 50, and 60. Once fabricated as single pixel devices, we carried-out a series of device measurements such as spectral response, dark current, total current, responsivity along with computing the photoconductive gain and the activation energies. The goal of these experiments is to not only study the single pixel detector performance with varying number of stacks in a D-DWELL structure, but to also understand the effect of the transport mechanism in these devices.

Citation Download Citation

M. N. Kutty, Y. D. Sharma, A. Barve, J. Shao, E. Plis, R. V. Shenoi, S. Krishna, S. J. Lee, and S. K. Noh "Investigation of multi-stack quantum dots-in-double-well infrared detectors", Proc. SPIE 7467, Nanophotonics and Macrophotonics for Space Environments III, 74670V (9 September 2009); https://doi.org/10.1117/12.827070

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