Organic–inorganic hybrid nanocomposite for enhanced photo-sensing of PFO-DBT:MEH-PPV:PC71BM blend-based photodetector
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The sensing parameters of previously reported PFO-DBT:MEH-PPV:PC71BM ternary blend-based organic photodetector have been improved in the present study. Improvement has been successfully demonstrated by doping TiO2 nanoparticles in the PEDOT:PSS thin film. TiO2 nanoparticles of 50, 100 and 250 nm diameters have initially been dispersed in PEDOT:PSS, and the resulting suspension has been spun coated on glass substrates and subjected to UV/vis and PL study. Thin film of PEDOT:PSS–TiO2 (100 nm) has shown maximum quenching in PL spectra, along with fairly good visible-light absorption. For further studies, 5 wt% TiO2 (100 nm) nanoparticles dispersion in PEDOT:PSS has been utilized for the fabrication of ITO/PEDOT:PSS–TiO2/PFO-DBT:MEH-PPV:PC71BM/Al photodiode. The PEDOT:PSS–TiO2 suspension has been spun coated onto the ITO substrates primarily and annealed to densify the film by vaporizing water contents in the film. A ternary blend of PFO-DBT:MEH-PPV:PC71BM in optimized volumetric ratio has been sequentially spun-cast to serve as a photoactive film. Significantly improved values of the sensing parameters such as responsivity (4 mA/W) and photo-to-dark current ratio (~6.4 × 104) have also been found. Response/recovery times of the fabricated sensor remain almost the same (<1 s) as previously reported for PFO-DBT:MEH-PPV:PC71BM ternary blend.
KeywordsPFO-DBT MEH-PPV Light scattering Hybrid organic–inorganic composite Hybrid photodetector Nanoscale sensor
This research was supported by High Impact Research MoE Grant UM.S/625/3/HIR/MoE/SC/26 with account number UM.0000080/HIR.C3, Flagship grant project number FL001C-14AET and IPPP research grant PG089-2012B from University of Malaya.
Qayyum Zafar, Mansoor Ani and Zubair Ahmad have jointly conducted the experimental work. Experimental designing has been done by Zubair Ahmad. Khaulah Sulaiman has made the significant intellectual contribution to the paper by supervising this research work.
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Conflict of Interest
The authors declare no conflict of interest.
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