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Proceedings Paper

Sub-monolayer InAs/InGaAs quantum dot infrared photodetectors (SML-QDIP)
Author(s): Jun Oh Kim; Saumya Sengupta; Yagya Sharma; Ajit V. Barve; Sang Jun Lee; Sam Kyu Noh; Sanjay Krishna
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Paper Abstract

We have investigated optical properties and figures of merit of sub-monolayer quantum dots (SML-QD) infrared photodetector and compared them with conventional Stranski-Krastanov quantum dots (SK-QD) with a similar design. The purpose of this study is to examine the effects of varying the number of stacks(2,3,4,5 and 6) in SML-QD detector on its device performance The peak of photoluminescence (PL) spectra of SK-QD and SML-QDs are observed at 1.07eV and 1.24~1.35eV at room temperature, respectively. The PL peak of 2 and 3 stacks SML QD are very close to the GaAs band edge peak (1.42eV) and the full width at half maximum (FWHM) of all the SML-QD are much narrower than SK-QD. Normal incidence photoresponse peak of 4 stacks SML QDIP are obtained at 7.5μm with responsivity of 0.5 A/W and detectivity of 1.2×1011 cm.Hz1/2/W (77K, 0.4V, f/2 optics), which is much narrower than spectral response of SK QDIP possibly due to bound-to-bound transition.

Paper Details

Date Published: 31 May 2012
PDF: 6 pages
Proc. SPIE 8353, Infrared Technology and Applications XXXVIII, 835336 (31 May 2012); doi: 10.1117/12.919458
Show Author Affiliations
Jun Oh Kim, Univ. of New Mexico (United States)
Saumya Sengupta, Univ. of New Mexico (United States)
Yagya Sharma, Univ. of New Mexico (United States)
Ajit V. Barve, Univ. of New Mexico (United States)
Sang Jun Lee, Korean Research Institute of Standards and Science (Korea, Republic of)
Sam Kyu Noh, Korean Research Institute of Standards and Science (Korea, Republic of)
Sanjay Krishna, Univ. of New Mexico (United States)


Published in SPIE Proceedings Vol. 8353:
Infrared Technology and Applications XXXVIII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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