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Title: Photogating-driven enhanced responsivity in a few-layered ReSe2 phototransistor

Journal Article · · Journal of Materials Chemistry C
DOI:https://doi.org/10.1039/d1tc01973b· OSTI ID:1839982
ORCiD logo [1]; ORCiD logo [2];  [1];  [1]; ORCiD logo [3];  [4];  [5];  [6];  [3];  [3]; ORCiD logo [3]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [1]
  1. Southern Illinois Univ., Carbondale, IL (United States)
  2. Southern Illinois Univ., Carbondale, IL (United States); Great Basin College, Elko, NV (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
  5. Jackson State Univ., Jackson, MS (United States)
  6. National High Magnetic Field Lab., Tallahassee, FL (United States)
  7. Argonne National Lab. (ANL), Argonne, IL (United States); Jackson State Univ., Jackson, MS (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)

A wide variety of two-dimensional (2D) metal dichalcogenide compounds have recently attracted much research interest due to their very high photoresponsivities (R) making them excellent candidates for optoelectronic applications. High R in 2D photoconductors is associated with trap state dynamics leading to a photogating effect, which is often manifested by a fractional power dependence (γ) of the photocurrent (Iph) at an effective illumination intensity (Peff). Furthermore, we present photoconductivity studies as a function of gate voltages, over a wide temperature range (20 K to 300 K) of field-effect transistors fabricated using thin layers of mechanically exfoliated Rhenium Diselenide (ReSe2). We obtain very high responsivities R ~ 16500 A/W and external quantum efficiency (EQE) ~ 3.2 × 106% (at 140 K, Vg = 60 V and Peff = 0.2 nW). A strong correlation between R and γ was established by investigating the dependence of these two quantities at various gate voltages and over a wide range of temperatures. Such correlations indicate the importance of trap state mediated photogating and its role in promoting high photo-responsivities in these materials. We believe such correlations can offer valuable insights for the design and development of high-performance photoactive devices using 2D materials.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1839982
Alternate ID(s):
OSTI ID: 1812403
Journal Information:
Journal of Materials Chemistry C, Vol. 9, Issue 36; ISSN 2050-7526
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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