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Picosecond Response Times in GaAs/AlGaAs Core/Shell Nanowire-Based Photodetectors
DREXEL UNIV PHILADELPHIA PA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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High-speed metal-semiconductor-metal MSM photodetectors based on Schottky-contacted coreshell GaAsAlGaAs and bare GaAs nanowires were fabricated and characterized. The measured coreshell 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 coreshell 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 coreshell nanowires in high-speed imaging arrays and on-chip optical interconnects.
APPROVED FOR PUBLIC RELEASE