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CuPc/C60 heterojunction for high responsivity zero bias organic red light photodetector

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Abstract

Organic photodetector (OPD), having copper phthalocyanine (CuPc) and fullerene (C60) bilayer heterojunction as an active layer, has been fabricated by employing thermal evaporation method for the red light detection applications. The spectral response has been observed to cover from 300 to 800 nm for the OPD. Experimental results of the OPD reflect good photodiode behavior. Noteworthy, our fabricated OPD has exhibited responsivity of 0.052 A/W and external quantum efficiency (EQE) of 9.28% at wavelength 700 nm and 0 V. Maximum photocurrent density to dark current density ratio has been found to be 4.5 × 104 under the illumination of red light. Detectivity at wavelength 700 nm and 0 V has been found to be on the order of 1011 Jones for the same OPD. Response time and recovery time are found to be 16 and 36 ms, respectively. Our fabricated OPD exhibits excellent stability. Thus, the CuPc/C60 based OPD has been found to be quite promising for the low cost molecular photodetector applications due to its zero bias high responsivity and detectivity.

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Acknowledgements

The authors gratefully acknowledge the Indian Nanoelectronics Users Program (a project of Meity, Govt of India) IIT Bombay, Mumbai, India and Department of Physics, Kazi Nazrul University, Asansol, India, for providing us experimental tool facilities. The authors also acknowledge Dr. Dinesh Kabra, Department of Physics, IIT Bombay, Mumbai, India, for fruitful discussions and suggestions during fabrication of device. This work is an outcome of the R&D work undertaken project under the Visvesvaraya PhD Scheme of Ministry of Electronics & Information & Technology, Government of India, being implemented by Digital India Corporation.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, National Institute of Technology Agartala, Agartala, Tripura, 799046, India

    Debarati Nath

  2. Department of Physics, Kazi Nazrul University, Asansol, West Bengal, 713340, India

    P. Dey & J. N. Roy

  3. Center for Organic Spintronics and Optoelectronics Devices, Kazi Nazrul University, Asansol, West Bengal, 713340, India

    P. Dey & J. N. Roy

  4. IIT Bombay Nano Fabrication Facility (IITBNF), Center of Excellence in Nano Electronics (CEN), Department of Electrical Engineering, Indian Institute of Technology Bombay, Bombay, Maharashtra, 400076, India

    Aneesh M. Joseph

  5. Department of Electronics and Instrumentation Engineering, National Institute of Technology Agartala, Agartala, Tripura, 799046, India

    J. K. Rakshit

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  1. Debarati Nath
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Nath, D., Dey, P., Joseph, A.M. et al. CuPc/C60 heterojunction for high responsivity zero bias organic red light photodetector. Appl. Phys. A 126, 627 (2020). https://doi.org/10.1007/s00339-020-03806-w

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