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Title: Hybrid quantum dot-tin disulfide field-effect transistors with improved photocurrent and spectral responsivity

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4944781· OSTI ID:1245395
 [1];  [2];  [1];  [3];  [3];  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Univ. of Nebraska, Lincoln, NE (United States)

We report an improved photosensitivity in few-layer tin disulfide (SnS2) field-effect transistors(FETs) following doping with CdSe/ZnS core/shell quantum dots(QDs). The hybrid QD-SnS2 FET devices achieve more than 500% increase in the photocurrent response compared with the starting SnS2-only FET device and a spectral responsivity reaching over 650 A/W at 400 nm wavelength. The negligible electrical conductance in a control QD-only FET device suggests that the energy transfer between QDs and SnS2 is the main mechanism responsible for the sensitization effect, which is consistent with the strong spectral overlap between QDphotoluminescence and SnS2 optical absorption as well as the large nominal donor-acceptor interspacing between QD core and SnS2. Furthermore, we also find enhanced charge carrier mobility in hybrid QD-SnS2 FETs which we attribute to a reduced contact Schottky barrier width due to an elevated background charge carrier density.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704; SC0012704
OSTI ID:
1245395
Alternate ID(s):
OSTI ID: 1243145
Report Number(s):
BNL-111989-2016-JA; APPLAB; KC0403020
Journal Information:
Applied Physics Letters, Vol. 108, Issue 12; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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Cited By (4)

0D-2D and 1D-2D Semiconductor Hybrids Composed of All Inorganic Perovskite Nanocrystals and Single-Layer Graphene with Improved Light Harvesting journal December 2017
Locally Gated SnS2/hBN Thin Film Transistors with a Broadband Photoresponse journal July 2018
A SnS 2 -based photomemristor driven by sun journal January 2018
Influence of solid-state electrolyte on 2D SnS 2 field effect transistors journal May 2019