Realizing broad-bandwidth visible wavelength photodiode based on solution-processed ZnPc/PC 71 BM dyad

Zafar, Q. and Fatima, N. and Karimov, K.S. and Ahmed, M.M. and Sulaiman, K. (2017) Realizing broad-bandwidth visible wavelength photodiode based on solution-processed ZnPc/PC 71 BM dyad. Optical Materials, 64. pp. 131-136. ISSN 0925-3467, DOI

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Herein, we demonstrate a solution-processed visible wavelength organic photodiode (OPD) using donor/acceptor dyad of zinc phthalocyanine (ZnPc) and [6,6]-phenyl-C71-butyric-acid methyl ester (PC71BM), respectively. The synergic absorption profiles of both ZnPc and PC71BM moieties have been exploited to realize broader (350 and 800 nm) and consistent absorption spectrum of the photoactive film. The optimum loading ratio (by volume) of D/A dyad has been estimated to be 1:0.8, via quenching phenomenon in ZnPc photoluminescence spectrum. The performance of the OPD has been evaluated by detecting the photocurrent density with respect to varied illumination levels (0–150 mW/cm2) of impinging light at different reverse bias conditions. Under identical reverse bias mode, the photocurrent density has shown significant upsurge as the incident intensity of light is increased; ultimately leading to the significantly higher responsivity (162.4 μA/W) of the fabricated diode. The light to dark current density ratio (Jph/Jd) of the device at 3 V reverse bias has been calculated to be ∼20.12. The transient photocurrent density response of the fabricated OPD has also been characterized at −4 V operational bias under switch ON/OFF illumination. The measured response and recovery time for the fabricated OPD are ∼200 and 300 ms, respectively.

Item Type: Article
Funders: Ministry of Education: High Impact Research (HIR) grant UM.S/625/3/HIR/MOE/26, University Malaya Research Grant (UMRG): RP007A-13AFR, Partially funded by the University of Malaya postgraduate grant PG089-2012B
Uncontrolled Keywords: Organic bulk-heterojunction; Photodiode; ZnPC:PC71BM dyad; Synergic absorption; Photoluminescence
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 08 Jun 2018 07:49
Last Modified: 08 Jun 2018 07:49

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