CuPc/C 60 heterojunction for high responsivity zero bias organic red light photodetector
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CuPc/C60 heterojunction for high responsivity zero bias organic red light photodetector Debarati Nath1 · P. Dey2,3 · Aneesh M. Joseph4 · J. K. Rakshit5 · J. N. Roy2,3 Received: 13 April 2020 / Accepted: 14 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
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. Keywords CuPc · C60 · Organic photodetector · Organic semiconductor · Responsivity
1 Introduction Organic photodetectors (OPDs), employing organic semiconductors (OSs), have received considerable interest in the next generation fiber optic communication system, information technology etc. because of their distinct adjustable mechanical and optoelectrical properties [1–5]. Owing to the attractive advantages such as simple fabrication processing
* P. Dey [email protected] 1
Department of Electronics and Communication Engineering, National Institute of Technology Agartala, Agartala, Tripura 799046, India
2
Department of Physics, Kazi Nazrul University, Asansol, West Bengal 713340, India
3
Center for Organic Spintronics and Optoelectronics Devices, Kazi Nazrul University, Asansol, West Bengal 713340, India
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
5
Department of Electronics and Instrumentation Engineering, National Institute of Technology Agartala, Agartala, Tripura 799046, India
[2, 3, 6], flexibility [7, 8], low cost [7], high absorption coefficient [9], tunable band light detection [10] and ecofriendly processing [11], the OPD has become a promising candidate for replacement of the conventional inorganic photodetector [4, 5]. In this direction, of late, significant researches have been carried out in realization of the high performance OPD [5, 12–15]. For example, low cost, large area and flexible OPD has been fabricated by printing technique on the paper substrate [7]. Park et al. demonstrated th
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