InAs/GaSb superlattice infrared detectors
| Autor: | Matthias Wauro, Wolfgang Luppold, Andreas Wörl, Michael Masur, Frank Rutz, Johann Ziegler, Thomas E. Vandervelde, Volker Daumer, Robert Rehm, Ralf Scheibner, Dante F. DeMeo, Jasmin Niemasz, Johannes Schmitz, Martin Walther |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2013 |
| Předmět: |
Physics
InAs/GaSb superlattice business.industry Superlattice Shot noise infrared focal plane array LWIR Heterojunction MWIR Carrier lifetime Condensed Matter Physics Avalanche photodiode dual-color Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Photodiode law.invention Optics Superlattice empirical pseudopotential method law Optoelectronics business Dark current Leakage (electronics) |
| Zdroj: | Infrared Physics & Technology. 59:6-11 |
| ISSN: | 1350-4495 |
| DOI: | 10.1016/j.infrared.2012.12.001 |
| Popis: | We report on the development of high-performance InAs/GaSb superlattice (SL) infrared (IR) detectors for the mid-wavelength (MWIR, 3–5 μm) and long-wavelength (LWIR, 8–12 μm) transmission window of the atmosphere. With a refined process technology, we are now able to fabricate dual-color focal plane arrays for the MWIR that excel at a very low number of noisy pixels. In an effort to correlate dark current and noise data of a larger number of devices, we found that for the description of the behavior in the white noise part of the spectrum, both, in InAs/GaSb SL photodiodes for the MWIR and the LWIR McIntyre’s well-known model for excess noise of avalanche photodiodes is, in general, much more suited than the commonly used shot noise model. The analysis of dark current contributions is a convenient method to identify limiting mechanisms and extract material parameters such as the minority carrier lifetime. We show that even in large area devices the contribution of the sidewall leakage path should not be ignored for this kind of investigation. Finally, we present our Al-free heterojunction device concept for reduced dark current. |
| Databáze: | OpenAIRE |
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