Infrared and Laser Engineering, Volume. 51, Issue 4, 20210399(2022)
Analysis of dark current characteristic of InAs/GaSb superlattice longwave infrared detectors
Figures & Tables(8)
Fig. 1. Energy band alignment of pN hetero-junciton. (a) Without contact; (b) With contact
Fig. 2. Schematic diagram of superlattice IR detector structure and its energy band alignment
Fig. 4. The relationship between the inverse product of resistances with area at zero bias with perimeter/area of detectors
Fig. 5. Measurement and fitting results of dark current of photodetector with 60 μm mesa size
Fig. 6. G-R current and trap assisted tunnel current of photodetector with different doping density of absorption layer
Table 1. Key parameter of IR detector structure
View tableView in ArticleTable 1. Key parameter of IR detector structure
Region Superlattice period Thickness/nm Doping concentration/cm−3 n-InAs cap layer -- 20 1×1018 N-region 18 mLs InAs/ 3 mLs GaSb/ 5 mLs AlSb/ 3 mLs 506 1×1018 M-barrier 18 mLs InAs/ 3 mLs GaSb/ 5 mLs AlSb/ 3 mLs 506 Unintentional doped (~2×1015) π-region 14 mLs InAs/ 7 mLs GaSb 2182 2×1016 P-region 8 mLs InAs/ 8 mLs GaSb 586 1×1018 P-GaSb -- 500 1×1018
Table 2. Fitting parameters of model of dark current
View tableView in ArticleTable 2. Fitting parameters of model of dark current
Parameters Value Hole effective mass (mh) 0.4 m0 Electron effective mass (me) 0.04 m0 Electron tunneling effective mass (mT) 0.04 m0 Electron mobility 2 000 cm2Vs−1 Hole mobility 200 cm2Vs−1 Electron lifetime (τe) 30 ns GR lifetime (τGR) 30 ns Bandgap of absorption layer (Eg) 0.12 eV Trap energy level (Et) 3/4 Eg Dielectric constant (εs) 15.34 ε0 Trap density (Nt) 2.1×1013 cm−3 Doping density of absorption layer (NA) 2×1016 cm−3 Doping density of barrier layer (ND) 2×1015 cm−3
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Junbin Li, Aimin Liu, Zhi Jiang, Jin Yang, Wen Yang, Jincheng Kong, Dongsheng Li, Yanhui Li, Xuchang Zhou. Analysis of dark current characteristic of InAs/GaSb superlattice longwave infrared detectors[J]. Infrared and Laser Engineering, 2022, 51(4): 20210399
Paper Information
Category: Special issue—Infrared detection and recognition technology under superspeed flow field
Received: Dec. 25, 2021
Accepted: --
Published Online: May. 18, 2022
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