Picosecond response times in GaAs/AlGaAs core/shell nanowire-based photodetectors
Abstract
High-speed metal-semiconductor-metal (MSM) photodetectors based on Schottky-contacted core/shell GaAs/AlGaAs and bare GaAs nanowires were fabricated and characterized. The measured core/shell temporal response has a ∼10 ps full-width at half-maximum and an estimated corrected value less than 5 ps. The bare GaAs devices exhibit a slower response (∼35 ps) along with a slow decaying persistent photocurrent (∼80 s). The core/shell devices exhibit significantly improved dc and high-speed performance over bare nanowires and comparable performance to planar MSM photodetectors. The picosecond temporal response, coupled with picoampere dark current, demonstrate the potential for core/shell nanowires in high-speed imaging arrays and on-chip optical interconnects.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 13, 2011
- Source ID
- 10.1063/1.3600061
Entities
People
- Bahram Nabet
- Eric M. Gallo
- Guannan Chen
- Jonathan E Spanier
- Marc Currie
- Nico Lovergine
- Paola Prete
- Terrence Mcguckin
Organizations
- Army Research Office
- Consiglio Nazionale delle Ricerche
- Drexel University
- National Science Foundation
- Office of Naval Research
- United States Naval Research Laboratory
- University of Salento