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 slowdecaying persistent photocurrent (~80 s). The core/shell devices exhibit significantly improved dcand 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
- Technical Report
- Publication Date
- Jan 01, 2011
- Accession Number
- ADA561496
Entities
People
- Bahram Nabet
- Eric M. Gallo
- Guannan Chen
- Jonathan E Spanier
- Marc Currie
- Nico Lovergine
- Paola Prete
- Terrence Mcguckin
Organizations
- Drexel University