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High-Responsivity Photodetection by a Self-Catalyzed Phase-Pure p-GaAs Nanowire

Ali, H; Zhang, Y; Tang, J; Peng, K; Sun, S; Sun, Y; Song, F; ... Xu, X; + view all (2018) High-Responsivity Photodetection by a Self-Catalyzed Phase-Pure p-GaAs Nanowire. Small , 14 (17) 10.1002/smll.201704429. Green open access

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Abstract

Defects are detrimental for optoelectronics devices, such as stacking faults can form carrier‐transportation barriers, and foreign impurities (Au) with deep‐energy levels can form carrier traps and nonradiative recombination centers. Here, self‐catalyzed p‐type GaAs nanowires (NWs) with a pure zinc blende (ZB) structure are first developed, and then a photodetector made from these NWs is fabricated. Due to the absence of stacking faults and suppression of large amount of defects with deep energy levels, the photodetector exhibits room‐temperature high photoresponsivity of 1.45 × 105 A W−1 and excellent specific detectivity (D*) up to 1.48 × 1014 Jones for a low‐intensity light signal of wavelength 632.8 nm, which outperforms previously reported NW‐based photodetectors. These results demonstrate these self‐catalyzed pure‐ZB GaAs NWs to be promising candidates for optoelectronics applications.

Type: Article
Title: High-Responsivity Photodetection by a Self-Catalyzed Phase-Pure p-GaAs Nanowire
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/smll.201704429
Publisher version: http://doi.org/10.1002/smll.201704429
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: GaAs nanowires, self-catalyzed growth, phase-pure crystal structure, photodetector, photo-responsivity.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/10048707
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