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High Responsivity of InP/InAsP Nanowire Array Broadband Photodetectors Enhanced by Optical Gating

Karimi, Mohammad LU ; Zeng, Xulu LU ; Witzigmann, Bernd ; Samuelson, Lars LU ; Borgström, Magnus LU and Pettersson, Håkan LU (2019) In Nano Letters 19(12). p.8424-8430
Abstract
High-performance photodetectors operating in the near-infrared (0.75–1.4 μm) and short-wave infrared (1.4–3.0 μm) portion of the electromagnetic spectrum are key components in many optical systems. Here, we report on a combined experimental and theoretical study of square millimeter array infrared photodetectors comprising 3 million n+–i–n+ InP nanowires grown by MOVPE from periodically ordered Au seed particles. The nominal i-segment, comprising 20 InAs0.40P0.60 quantum discs, was grown by use of an optimized Zn doping to compensate the nonintentional n-doping. The photodetectors exhibit bias- and power-dependent responsivities reaching record-high values of 250 A/W at 980 nm/20 nW and 990 A/W at 532 nm/60 nW, both at 3.5 V bias.... (More)
High-performance photodetectors operating in the near-infrared (0.75–1.4 μm) and short-wave infrared (1.4–3.0 μm) portion of the electromagnetic spectrum are key components in many optical systems. Here, we report on a combined experimental and theoretical study of square millimeter array infrared photodetectors comprising 3 million n+–i–n+ InP nanowires grown by MOVPE from periodically ordered Au seed particles. The nominal i-segment, comprising 20 InAs0.40P0.60 quantum discs, was grown by use of an optimized Zn doping to compensate the nonintentional n-doping. The photodetectors exhibit bias- and power-dependent responsivities reaching record-high values of 250 A/W at 980 nm/20 nW and 990 A/W at 532 nm/60 nW, both at 3.5 V bias. Moreover, due to the embedded quantum discs, the photoresponse covers a broad spectral range from about 0.70 to 2.5 eV, in effect outperforming conventional single InGaAs detectors and dual Si/Ge detectors. The high responsivity, and related gain, results from a novel proposed photogating mechanism, induced by the complex charge carrier dynamics involving optical excitation and recombination in the quantum discs and interface traps, which reduces the electron transport barrier between the highly doped n+ contact and the i-segment. The experimental results obtained are in perfect agreement with the proposed theoretical model and represent a significant step forward toward understanding gain in nanoscale photodetectors and realization of commercially viable broadband photon detectors with ultrahigh gain. (Less)
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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nano Letters
volume
19
issue
12
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:31721593
  • scopus:85075689177
ISSN
1530-6992
DOI
10.1021/acs.nanolett.9b02494
language
English
LU publication?
yes
id
144d9ac6-0be0-4774-a119-7d9a02119c30
date added to LUP
2019-11-28 11:11:35
date last changed
2023-11-19 21:14:54
@article{144d9ac6-0be0-4774-a119-7d9a02119c30,
  abstract     = {{High-performance photodetectors operating in the near-infrared (0.75–1.4 μm) and short-wave infrared (1.4–3.0 μm) portion of the electromagnetic spectrum are key components in many optical systems. Here, we report on a combined experimental and theoretical study of square millimeter array infrared photodetectors comprising 3 million n+–i–n+ InP nanowires grown by MOVPE from periodically ordered Au seed particles. The nominal i-segment, comprising 20 InAs0.40P0.60 quantum discs, was grown by use of an optimized Zn doping to compensate the nonintentional n-doping. The photodetectors exhibit bias- and power-dependent responsivities reaching record-high values of 250 A/W at 980 nm/20 nW and 990 A/W at 532 nm/60 nW, both at 3.5 V bias. Moreover, due to the embedded quantum discs, the photoresponse covers a broad spectral range from about 0.70 to 2.5 eV, in effect outperforming conventional single InGaAs detectors and dual Si/Ge detectors. The high responsivity, and related gain, results from a novel proposed photogating mechanism, induced by the complex charge carrier dynamics involving optical excitation and recombination in the quantum discs and interface traps, which reduces the electron transport barrier between the highly doped n+ contact and the i-segment. The experimental results obtained are in perfect agreement with the proposed theoretical model and represent a significant step forward toward understanding gain in nanoscale photodetectors and realization of commercially viable broadband photon detectors with ultrahigh gain.}},
  author       = {{Karimi, Mohammad and Zeng, Xulu and Witzigmann, Bernd and Samuelson, Lars and Borgström, Magnus and Pettersson, Håkan}},
  issn         = {{1530-6992}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{12}},
  pages        = {{8424--8430}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Nano Letters}},
  title        = {{High Responsivity of InP/InAsP Nanowire Array Broadband Photodetectors Enhanced by Optical Gating}},
  url          = {{http://dx.doi.org/10.1021/acs.nanolett.9b02494}},
  doi          = {{10.1021/acs.nanolett.9b02494}},
  volume       = {{19}},
  year         = {{2019}},
}