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 full-width at half-maximum and an estimated corrected value less than 5 ps. The bare GaAs devices exhibit a slower response along with a slow decaying persistent photocurrent . 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.
Picosecond response times in GaAs/AlGaAs core/shell nanowire-based photodetectors
Eric M. Gallo, Guannan Chen, Marc Currie, Terrence McGuckin, Paola Prete, Nico Lovergine, Bahram Nabet, Jonathan E. Spanier; Picosecond response times in GaAs/AlGaAs core/shell nanowire-based photodetectors. Appl. Phys. Lett. 13 June 2011; 98 (24): 241113. https://doi.org/10.1063/1.3600061
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