Enhancing Performance of a GaAs/AlGaAs/GaAs Nanowire Photodetector Based on the Two-Dimensional Electron-Hole Tube Structure
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
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Detail(s)
Original language | English |
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Pages (from-to) | 2654-2659 |
Journal / Publication | Nano Letters |
Volume | 20 |
Issue number | 4 |
Online published | 26 Feb 2020 |
Publication status | Published - 8 Apr 2020 |
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Abstract
Here, we design and engineer an axially asymmetric GaAs/AlGaAs/GaAs (G/A/G) nanowire (NW) photodetector that operates efficiently at room temperature. Based on the I-type band structure, the device can realize a two-dimensional electron-hole tube (2DEHT) structure for the substantial performance enhancement. The 2DEHT is observed to form at the interface on both sides of GaAs/AlGaAs barriers, which constructs effective pathways for both electron and hole transport in reducing the photocarrier recombination and enhancing the device photocurrent. In particular, the G/A/G NW photodetector exhibits a responsivity of 0.57 A/W and a detectivity of 1.83 × 1010 Jones, which are about 7 times higher than those of the pure GaAs NW device. The recombination probability has also been significantly suppressed from 81.8% to 13.2% with the utilization of the 2DEHT structure. All of these can evidently demonstrate the importance of the appropriate band structure design to promote photocarrier generation, separation, and collection for high-performance optoelectronic devices.
Research Area(s)
- AlGaAs, GaAs, nanowire, photodetector, photoresponse, two-dimensional electron-hole tube
Citation Format(s)
Enhancing Performance of a GaAs/AlGaAs/GaAs Nanowire Photodetector Based on the Two-Dimensional Electron-Hole Tube Structure. / Zhu, Xiaotian; Lin, Fengyuan; Zhang, Zhihong; Chen, Xue; Huang, Hao; Wang, Dengkui; Tang, Jilong; Fang, Xuan; Fang, Dan; Ho, Johnny C.; Liao, Lei; Wei, Zhipeng.
In: Nano Letters, Vol. 20, No. 4, 08.04.2020, p. 2654-2659.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review