Low-noise AlInAsSb avalanche photodiode
Abstract
We report low-noise avalanche gain from photodiodes composed of a previously uncharacterized alloy, Al0.7In0.3As0.3Sb0.7, grown on GaSb. The bandgap energy and thus the cutoff wavelength are similar to silicon; however, since the bandgap of Al0.7In0.3As0.3Sb0.7 is direct, its absorption depth is 5 to 10 times shorter than indirect-bandgap silicon, potentially enabling significantly higher operating bandwidths. In addition, unlike other III-V avalanche photodiodes that operate in the visible or near infrared, the excess noise factor is comparable to or below that of silicon, with a k-value of approximately 0.015. Furthermore, the wide array of absorber regions compatible with GaSb substrates enable cutoff wavelengths ranging from 1 μm to 12 μm.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 22, 2016
- Source ID
- 10.1063/1.4942372
Entities
People
- Joe C. Campbell
- Madison Woodson
- Min Ren
- Scott Maddox
- Seth R. Bank
- Yaojia Chen
Organizations
- Army Research Office
- University of Texas at Austin
- University of Virginia