Wavelength-extended photovoltaic infrared photodetectors
Abstract
We report the incorporation of a long-wavelength photovoltaic response (up to 8 μm) in a short-wavelength p-type GaAs heterojunction detector (with the activation energy of EA∼0.40 eV), operating at 80 K. This wavelength-extended photovoltaic response is enabled by employing a non-symmetrical band alignment. The specific detectivity at 5 μm is obtained to be 3.5 × 1012 cm Hz1∕2/W, an improvement by a factor of 105 over the detector without the wavelength extension.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 31, 2014
- Source ID
- 10.1063/1.4869958
Entities
People
- A G Unil Perera
- E. H. Linfield
- L. H. Li
- P. K. D. D. P. Pitigala
- S. P. Khanna
- Yan-feng Lao
Organizations
- Army Research Office
- Georgia State University
- University of Leeds