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High photoresponsivity and light-induced carrier conversion in RGO/TSCuPc hybrid phototransistors

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Abstract

Reduced graphene oxide (RGO) and its composites have a great potential for their applications in optoelectronic devices. In particular, small molecules can be used for tailoring optoelectronic properties of RGO. Here, we report the fabrication of a hybrid RGO/tetrasulfonate salt of the copper phthalocyanine (RGO/TSCuPc) nanocomposite phototransistor. The device shows p-type transistor behavior in the dark which changes to ambipolar behavior at the lower light intensity, and then shows a complete n-type property at the higher light intensity. The photoresponsivity of the device can be tuned by gate voltages, and the best photoresponsivity is recorded to be as high as ∼4.6 A/W for positive gate voltage and ∼6.3 A/W with a negative sign for negative gate voltage under solar light irradiation. The observations suggest that the photogenerated free electrons of TSCuPc molecules can be injected efficiently onto RGO sheets, resulting in increases in electron conduction and hole quenching.

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Author notes

  1. Tanusri Pal

    Present address: Department of Physics, Midnapore College, Midnapore, 721101, India

  2. Surajit Ghosh

    Present address: Department of Physics and Technophysics, Vidyasagar University, Midnapore, 721102, India

  3. These authors contributed equally to this work.

Authors and Affiliations

  1. Nanoscience Technology Center, University of Central Florida, Orlando, Florida, 32826, USA

    Tanusri Pal, Daeha Joung, Surajit Ghosh, Anindarupa Chunder, Lei Zhai & Saiful I. Khondaker

  2. Department of Physics, University of Central Florida, Orlando, Florida, 32826, USA

    Daeha Joung & Saiful I. Khondaker

  3. Department of Chemistry, University of Central Florida, Orlando, Florida, 32826, USA

    Anindarupa Chunder & Lei Zhai

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  1. Tanusri Pal
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Correspondence to Tanusri Pal or Saiful I. Khondaker.

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Pal, T., Joung, D., Ghosh, S. et al. High photoresponsivity and light-induced carrier conversion in RGO/TSCuPc hybrid phototransistors. Journal of Materials Research 33, 3999–4006 (2018). https://doi.org/10.1557/jmr.2018.370

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