Accession Number:

ADA561496

Title:

Picosecond Response Times in GaAs/AlGaAs Core/Shell Nanowire-Based Photodetectors

Descriptive Note:

Journal article

Corporate Author:

DREXEL UNIV PHILADELPHIA PA DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

• Gallo, Eric M.
• Chen, Guannan
• Currie, Marc
• McGuckin, Terrence
• Prete, Paola
• Lovergine, Nico
• Nabet, Bahram
• Spanier, Jonathan E.

Report Date:

2011-01-01

Pagination or Media Count:

4.0

Abstract:

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.

Descriptors:

• *GALLIUM ARSENIDES
• *NANOWIRES
• *PHOTODETECTORS
• CHIPS(ELECTRONICS)
• COMPLEMENTARY METAL OXIDE SEMICONDUCTORS
• ELECTRIC CURRENT
• ELECTRONICS
• OPTICAL DETECTORS
• OPTICAL INTERCONNECTIONS
• PHOTOELECTRICITY
• QUANTUM EFFICIENCY
• REPRINTS
• SEMICONDUCTORS

Subject Categories:

• Electrical and Electronic Equipment
• Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE