Binary superlattice quantum-well infrared photodetectors for long-wavelength broadband detection.
- Princeton University, Princeton, NJ
- U. S. Army Research Laboratory, Adelphi, MD
We have adopted a binary superlattice structure for long-wavelength broadband detection. In this superlattice, the basis contains two unequal wells, with which more energy states are created for broadband absorption. At the same time, responsivity is more uniform within the detection band because of mixing of wave functions from the two wells. This uniform line shape is particularly suitable for spectroscopy applications. The detector is designed to cover the entire 8-14 {micro}m long-wavelength atmospheric window. The observed spectral widths are 5.2 and 5.6 {micro}m for two nominally identical wafers. The photoresponse spectra from both wafers are nearly unchanged over a wide range of operating bias and temperature. The background-limited temperature is 50 K at 2 V bias for F/1.2 optics.
- Research Organization:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1004361
- Report Number(s):
- SAND2003-3017J
- Journal Information:
- Proposed for publication in Applied Physics Letters., Journal Name: Proposed for publication in Applied Physics Letters. Journal Issue: 25 Vol. 84; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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