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Demonstration of Far-Infrared GaAs/AlGaAs Quantum Well Photodetectors for Broadband Wavelength Detection |
| SHEN Wen-Zhong1,2;Perera A. G. U.3 |
| 1Department of Applied Physics, Shanghai Jiao Tong University, Shanghai 200030
2National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Shanghai 200083
3Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA
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| Cite this article: |
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SHEN Wen-Zhong, Perera A. G. U. 2000 Chin. Phys. Lett. 17 921-923 |
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Abstract We discuss the realization of broadband wavelength detection by demonstrating the longest cutoff wavelength (λc = 28.6 μm) far-infrared GaAs/AIGaAs quantum well infrared photodetectors (QWIPs). The responsivity is comparable to that of mid-infrared GaAs/AIGaAs and InGaAs/GaAs QWIPs, with a responsivity of 0.265 A/W and detectivity of 3.4x109 cm.Hz1/2/W at the peak wavelength of 26.9μm at 4.2K. Based on the temperature-dependent dark current and response results, it is expected that similar performance can be obtained at least up to 20 K. Several ways to expand the wavelength coverage are also addressed.
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| Keywords:
85.60.Gz
72.40.+w
73.61.Ey
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Published: 01 December 2000
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| PACS: |
85.60.Gz
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(Photodetectors (including infrared and CCD detectors))
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72.40.+w
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(Photoconduction and photovoltaic effects)
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73.61.Ey
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(III-V semiconductors)
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