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Fast and Highly Sensitive Ionic‐Polymer‐Gated WS2–Graphene Photodetectors

The combination of graphene with semiconductor materials in heterostructure photodetectors enables amplified detection of femtowatt light signals using micrometer‐scale electronic devices. Presently, long‐lived charge traps limit the speed of such detectors, and impractical strategies, e.g., the use... Full description

Journal Title: Advanced Materials June 2017, Vol.29(23), pp.n/a-n/a
Main Author: Mehew, Jake D.
Other Authors: Unal, Selim , Torres Alonso, Elias , Jones, Gareth F. , Fadhil Ramadhan, Saad , Craciun, Monica F. , Russo, Saverio
Format: Electronic Article Electronic Article
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ID: ISSN: 0935-9648 ; E-ISSN: 1521-4095 ; DOI: 10.1002/adma.201700222
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recordid: wj10.1002/adma.201700222
title: Fast and Highly Sensitive Ionic‐Polymer‐Gated WS2–Graphene Photodetectors
format: Article
creator:
  • Mehew, Jake D.
  • Unal, Selim
  • Torres Alonso, Elias
  • Jones, Gareth F.
  • Fadhil Ramadhan, Saad
  • Craciun, Monica F.
  • Russo, Saverio
subjects:
  • Graphene
  • Ionic‐Polymer Gating
  • Photodetectors
  • Van Der Waals Heterostructures
  • Ws 2
ispartof: Advanced Materials, June 2017, Vol.29(23), pp.n/a-n/a
description: The combination of graphene with semiconductor materials in heterostructure photodetectors enables amplified detection of femtowatt light signals using micrometer‐scale electronic devices. Presently, long‐lived charge traps limit the speed of such detectors, and impractical strategies, e.g., the use of large gate‐voltage pulses, have been employed to achieve bandwidths suitable for applications such as video‐frame‐rate imaging. Here, atomically thin graphene–WS heterostructure photodetectors encapsulated in an ionic polymer are reported, which are uniquely able to operate at bandwidths up to 1.5 kHz whilst maintaining internal gain as large as 10. Highly mobile ions and the nanometer‐scale Debye length of the ionic polymer are used to screen charge traps and tune the Fermi level of the graphene over an unprecedented range at the interface with WS. Responsivity = 10 A W and detectivity = 3.8 × 10 Jones are observed, approaching that of single‐photon counters. The combination of both high responsivity and fast response times makes these photodetectors suitable for video‐frame‐rate imaging applications. with an internal gain as large as 10 is realized for the first time in atomically thin heterostructures of WS and graphene. Highly mobile ions in the ionic‐polymer gate are used to screen charge traps enabling the creation of photodetectors suitable for video‐frame‐rate imaging applications.
language:
source:
identifier: ISSN: 0935-9648 ; E-ISSN: 1521-4095 ; DOI: 10.1002/adma.201700222
fulltext: fulltext
issn:
  • 0935-9648
  • 09359648
  • 1521-4095
  • 15214095
url: Link


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titleFast and Highly Sensitive Ionic‐Polymer‐Gated WS2–Graphene Photodetectors
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subjectGraphene ; Ionic‐Polymer Gating ; Photodetectors ; Van Der Waals Heterostructures ; Ws 2
descriptionThe combination of graphene with semiconductor materials in heterostructure photodetectors enables amplified detection of femtowatt light signals using micrometer‐scale electronic devices. Presently, long‐lived charge traps limit the speed of such detectors, and impractical strategies, e.g., the use of large gate‐voltage pulses, have been employed to achieve bandwidths suitable for applications such as video‐frame‐rate imaging. Here, atomically thin graphene–WS heterostructure photodetectors encapsulated in an ionic polymer are reported, which are uniquely able to operate at bandwidths up to 1.5 kHz whilst maintaining internal gain as large as 10. Highly mobile ions and the nanometer‐scale Debye length of the ionic polymer are used to screen charge traps and tune the Fermi level of the graphene over an unprecedented range at the interface with WS. Responsivity = 10 A W and detectivity = 3.8 × 10 Jones are observed, approaching that of single‐photon counters. The combination of both high responsivity and fast response times makes these photodetectors suitable for video‐frame‐rate imaging applications. with an internal gain as large as 10 is realized for the first time in atomically thin heterostructures of WS and graphene. Highly mobile ions in the ionic‐polymer gate are used to screen charge traps enabling the creation of photodetectors suitable for video‐frame‐rate imaging applications.
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titleFast and Highly Sensitive Ionic‐Polymer‐Gated WS2–Graphene Photodetectors
descriptionThe combination of graphene with semiconductor materials in heterostructure photodetectors enables amplified detection of femtowatt light signals using micrometer‐scale electronic devices. Presently, long‐lived charge traps limit the speed of such detectors, and impractical strategies, e.g., the use of large gate‐voltage pulses, have been employed to achieve bandwidths suitable for applications such as video‐frame‐rate imaging. Here, atomically thin graphene–WS heterostructure photodetectors encapsulated in an ionic polymer are reported, which are uniquely able to operate at bandwidths up to 1.5 kHz whilst maintaining internal gain as large as 10. Highly mobile ions and the nanometer‐scale Debye length of the ionic polymer are used to screen charge traps and tune the Fermi level of the graphene over an unprecedented range at the interface with WS. Responsivity = 10 A W and detectivity = 3.8 × 10 Jones are observed, approaching that of single‐photon counters. The combination of both high responsivity and fast response times makes these photodetectors suitable for video‐frame‐rate imaging applications. with an internal gain as large as 10 is realized for the first time in atomically thin heterostructures of WS and graphene. Highly mobile ions in the ionic‐polymer gate are used to screen charge traps enabling the creation of photodetectors suitable for video‐frame‐rate imaging applications.
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titleFast and Highly Sensitive Ionic‐Polymer‐Gated WS2–Graphene Photodetectors
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abstractThe combination of graphene with semiconductor materials in heterostructure photodetectors enables amplified detection of femtowatt light signals using micrometer‐scale electronic devices. Presently, long‐lived charge traps limit the speed of such detectors, and impractical strategies, e.g., the use of large gate‐voltage pulses, have been employed to achieve bandwidths suitable for applications such as video‐frame‐rate imaging. Here, atomically thin graphene–WS heterostructure photodetectors encapsulated in an ionic polymer are reported, which are uniquely able to operate at bandwidths up to 1.5 kHz whilst maintaining internal gain as large as 10. Highly mobile ions and the nanometer‐scale Debye length of the ionic polymer are used to screen charge traps and tune the Fermi level of the graphene over an unprecedented range at the interface with WS. Responsivity = 10 A W and detectivity = 3.8 × 10 Jones are observed, approaching that of single‐photon counters. The combination of both high responsivity and fast response times makes these photodetectors suitable for video‐frame‐rate imaging applications. with an internal gain as large as 10 is realized for the first time in atomically thin heterostructures of WS and graphene. Highly mobile ions in the ionic‐polymer gate are used to screen charge traps enabling the creation of photodetectors suitable for video‐frame‐rate imaging applications.
doi10.1002/adma.201700222
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