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

Abstract

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 (I_ph) at an effective illumination intensity (P_eff). 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, V_g = 60 V and P_eff = 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.

Authors:

Patil, Prasanna D.  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-9296-1102"

Wasala, Milinda  ^[2];

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• Search DOE PAGES for ORCID "0000-0003-1503-3756"

Alkhaldi, Rana ^[1]; Weber, Lincoln ^[1]; Kovi, Kiran Kumar  ^[3];

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• Search DOE PAGES for ORCID "0000-0003-0669-9476"

Chakrabarti, Bhaswar ^[4]; Nash, Jawnaye A. ^[5]; Rhodes, Daniel ^[6]; Rosenmann, Daniel ^[3]; Divan, Ralu ^[3]; Sumant, Anirudha V.  ^[3];

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• Search DOE PAGES for ORCID "0000-0002-6028-0038"

Balicas, Luis  ^[6];

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• Search DOE PAGES for ORCID "0000-0002-5209-0293"

Pradhan, Nihar R.  ^[7];

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• Search DOE PAGES for ORCID "0000-0002-3912-4233"

Talapatra, Saikat  ^[1]

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• Search DOE PAGES for ORCID "0000-0001-8503-7571"

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+ Show Author Affiliations

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)

Publication Date:

Mon Jul 12 00:00:00 EDT 2021

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1839982

Alternate Identifier(s):

OSTI ID: 1812403

Grant/Contract Number:  

AC02-06CH11357

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Materials Chemistry C

Additional Journal Information:

Journal Volume: 9; Journal Issue: 36; Journal ID: ISSN 2050-7526

Publisher:

Royal Society of Chemistry

Country of Publication:

United States

Language:

English

Subject:

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY