Photogating-driven enhanced responsivity in a few-layered ReSe2 phototransistor
| Autor: | Anirudha V. Sumant, Ralu Divan, Rana Alkhaldi, Luis Balicas, Saikat Talapatra, Kiran Kumar Kovi, Bhaswar Chakrabarti, Lincoln Weber, Daniel Rhodes, Daniel Rosenmann, Prasanna Patil, Jawnaye Nash, Nihar R. Pradhan, Milinda Wasala |
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| Rok vydání: | 2021 |
| Předmět: |
Photocurrent
Materials science Thin layers business.industry Photoconductivity Transistor 02 engineering and technology General Chemistry Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Photodiode Responsivity law Materials Chemistry Optoelectronics Quantum efficiency 0210 nano-technology business |
| Zdroj: | Journal of Materials Chemistry C. 9:12168-12176 |
| ISSN: | 2050-7534 2050-7526 |
| Popis: | 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). Here 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. |
| Databáze: | OpenAIRE |
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