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Khatatbeh Ibtehaj,Mohammad Hafizuddin Hj Jumali,Sameer Al-Bati,Poh Choon Ooi,Bandar Ali Al-Asbahi,Abdullah Ahmed Ali Ahmed 한국고분자학회 2022 Macromolecular Research Vol.30 No.3
This work demonstrated the effect of the β-chain alignment degree on piezoelectric nanogenerator (PNG) performance. A simple, safe and low-cost fastcentrifugal spinning technique was used to produce self-poled poly(vinylidene fluoride) (PVDF) nanofiber. PNG based on acetone-prepared PVDF fibers, with high β-chain alignment, generated output open-circuit voltage (VOC) and short-circuit current (ISC) five times higher than the film counterpart. In addition, the fibers showed a remarkable increase in β-chain alignment degree as the ratio of N,N-dimethylformamide (DMF) solvent increased. The optimum nanofiber with the highest β-chain alignment degree, β-fraction and piezoelectric charge coefficient of 0.93, 91.8% and -120 pC.N-1 was obtained, respectively. PNG based on the optimum fiber displayed the highest VOC, ISC and power density of 14 V, 1.4 μA and 6.7 μWcm-2, respectively. This performance is greater than any PNG made from electrospun PVDF fiber. The excellent performance of the fabricated PNGs was strongly related to the high alignment degree of β-chains parallel along the fiber axis. In addition, due to low Young’s modulus (1.63 MPa) of the optimum fibers, the related lead-free PNG is sensitive to small movements and can be used in wearable and implanted medical devices.
Kai Jeat Hong,Sin Tee Tan,Kok-Keong Chong,리 호 뱅,Riski Titian Ginting,Fang Sheng Lim,Chi Chin Yap,Chun Hui Tan,Wei Sea Chang,Mohammad Hafizuddin Hj Jumali 한국물리학회 2018 Current Applied Physics Vol.18 No.12
Charge transport dynamics in ZnO based inverted organic solar cell (IOSC) has been characterized with transient photocurrent spectroscopy and localised photocurrent mapping-atomic force microscopy. The value of maximum exciton generation rate was found to vary from 2.6×1027m−3s−1 (Jsat=79.7 Am−2) to 2.9×1027m−3s−1 (Jsat=90.8 Am−2) for devices with power conversion efficiency ranging from 2.03 to 2.51%. These results suggest that nanorods served as an excellent electron transporting layer that provides efficient charge transport and enhances IOSC device performance. The photovoltaic performance of OSCs with various growth times of ZnO nanorods have been analysed for a comparison between AM1.5G spectrum and local solar spectrum. The simulated PCE of all devices operating under local spectrum exhibited extensive improvement with the gain of 13.3–13.7% in which the ZnO nanorods grown at 15 min possess the highest PCE under local solar with the value of 2.82%.