Monolithically integrated CdTe/InSb visible/midwave-infrared two-color photodetectors
| Autor: | Zhao-Yu He, Yong-Hang Zhang, Jacob Becker, Calli M. Campbell, Zhiyuan Lin, Maxwell B. Lassise |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry Infrared Photodetector 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Focal Plane Arrays Cadmium telluride photovoltaics Electronic Optical and Magnetic Materials 010309 optics Responsivity Tunnel junction 0103 physical sciences Optoelectronics 0210 nano-technology business Band rejection |
| Zdroj: | Infrared Physics & Technology. 97:58-62 |
| ISSN: | 1350-4495 |
| Popis: | This paper reports on the demonstration of two-terminal, two-color (visible/midwave-infrared, MWIR) photodetectors (2CPDs) consisting of monolithically-integrated CdTe nBn and InSb PN sub-detectors connected by an n-CdTe/p-InSb heterovalent tunnel junction grown on lattice-matched InSb substrates. The 2CPD can be switched between MWIR (1.5–5.5 μm with a peak responsivity of 0.75 A/W at 77 K) and visible (350–780 nm with a peak responsivity of 0.3 A/W) detection bands by applying different optical and electrical biases. Band rejection ratios of 18 dB and 52 dB, and spectral cross-talks of 40 dB and 31 dB are achieved for the visible and the MWIR bands, respectively. This 2CPD can be potentially used for visible/MWIR two-color focal plane arrays with optimal fill-factors and zero spatial offset between the visible and MWIR imaging channels. |
| Databáze: | OpenAIRE |
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