title: Room temperature GaAsSb single nanowire infrared photodetectors.
abstract: Antimonide-based ternary III-V nanowires (NWs) allow for a tunable bandgap over a wide range, which is highly interesting for optoelectronics applications, and in particular for infrared photodetection. Here we demonstrate room temperature operation of GaAs0.56Sb0.44 NW infrared photodetectors grown by metal organic vapor phase epitaxy. These GaAs0.56Sb0.44 NWs have uniform axial composition and show p-type conductivity with a peak field-effect mobility of ∼12 cm(2) V(-1) s(-1)). Under light illumination, single GaAs0.56Sb0.44 NW photodetectors exhibited typical photoconductor behavior with an increased photocurrent observed with the increase of temperature owing to thermal activation of carrier trap states. A broadband infrared photoresponse with a long wavelength cutoff at ∼1.66 μm was obtained at room temperature. At a low operating bias voltage of 0.15 V a responsivity of 2.37 (1.44) A/W with corresponding detectivity of 1.08 × 10(9) (6.55 × 10(8)) cm√Hz/W were achieved at the wavelength of 1.3 (1.55) μm, indicating that ternary GaAs0.56Sb0.44 NWs are promising photodetector candidates for small footprint integrated optical telecommunication systems.
authors.affiliation: Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia.
authors.forename: Ziyuan
authors.initials: Z
authors.lastname: Li
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Yuan
authors.forename: Lan
authors.initials: L
authors.lastname: Fu
authors.forename: Kun
authors.initials: K
authors.lastname: Peng
authors.forename: Fan
authors.initials: F
authors.lastname: Wang
authors.forename: Xiao
authors.initials: X
authors.lastname: Fu
authors.forename: Philippe
authors.initials: P
authors.lastname: Caroff
authors.forename: Thomas P
authors.initials: TP
authors.lastname: White
authors.forename: Hark
authors.initials: H
authors.lastname: Hoe Tan
authors.forename: Chennupati
authors.initials: C
authors.lastname: Jagadish