26 June 2014 Absorption characteristics of mid-wave infrared type-II superlattices
Author Affiliations +
Abstract
Recently, a new strategy used to achieve high operation temperature (HOT) infrared photodetectors including III-V compound materials (bulk materials and type-II superlattices) and cascade devices has been observed. Another method to reduce detector’s dark current is reducing volume of detector material via a concept of photon trapping detector. The barrier detectors are designed to reduce dark current associated with Shockley-Read (SR) processes and to decrease influence of surface leakage current without impeding photocurrent (signal). In consequence, absence of a depletion region in barrier detectors offers a way to overcome the disadvantage of large depletion dark currents. So, they are typically implemented in materials with relatively poor SR lifetimes, such as all III-V compounds. From considerations presented in the paper results that despite numerous advantages of III-V barrier detectors over present-day detection technologies, including reduced tunneling and surface leakage currents, normal-incidence absorption, and suppressed Auger recombination, the promise of a superior performance of these detectors in comparison to HgCdTe photodiodes, has not been yet realized. The dark current density is higher than that of bulk HgCdTe photodiodes, especially in MWIR range. To attain their full potential, the following essential technological limitations such as short carrier lifetime, passivation, and heterostructure engineering, need to be overcome.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gamini Ariyawansa, Elizabeth Steenbergen, Luke J. Bissell, Joshua M. Duran, John E. Scheihing, Michael T. Eismann, "Absorption characteristics of mid-wave infrared type-II superlattices", Proc. SPIE 9070, Infrared Technology and Applications XL, 90701J (26 June 2014); doi: 10.1117/12.2057506; https://doi.org/10.1117/12.2057506
PROCEEDINGS
15 PAGES


SHARE
Back to Top