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최근영,윤량영,신요한,한무재,김교태,허예지,남상희 대한의용생체공학회 2016 Biomedical Engineering Letters (BMEL) Vol.6 No.1
Purpose Some recent studies on bendable sensors havereported the reduction of distortion in X-ray shots caused bythe patient’s physical structure. In the field of diagnosticradiology, images are nowadays captured using flat paneldetectors, but it is difficult to take the geometrical body typeand physical characteristics of patients into considerationwith flat panels; this may distort images. This studyevaluates the bending and electrical properties of bottomelectrode-based sensors with bending capability. Methods This study evaluates the bending and electricalproperties of bottom electrode-based sensors with aluminium,copper, and indium tin oxide films. These sensors are fabricated,and their performance concerning bending resistance, sensitivity,and signal-to-noise ratio are evaluated and compared with areference sensor. Results These sensors are shown to provide similar results tothe reference sensor in what concerns the cubic functionality(of approx. 99%) of their response to tube voltage variations. The Al film-based sensor shows he lowest SNR value; theCu film shows excellent sensitivity, but with a slightly highdark current, resulting in a low SNR value. Conclusions Bendable detectors are possible solutions tomitigate the distortion in X-rays obtained with flat paneldetector. The results of this study can potentially be used asbasic research to support the next-generation bendabledetectors, and thus improve these distortions, caused by theX-ray patient’s physical structure.
Influences of metal nitrates as a surface modifier on the performance of hybrid solar cells
최근영,김수빈,성혜경,조성일,신동원,김욱현,우성호,한윤수 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Metal nitrates were introduced on the TiO<sub>2</sub> surfaces by soaking the TiO<sub>2</sub> films into an aqueous metal nitrate solution. The resulting electrodes were applied to the photoelectrodes of dye-sensitized solar cells (DSSCs). The DSSC with the Zn(NO<sub>3</sub>)<sub>2</sub>-modified TiO<sub>2</sub> electrode exhibited a short-circuit current (Jsc) of 12.77 mA/㎠ and an open-circuit voltage (Voc) of 626 mV, compared with a Jsc of 12.06 mA/㎠ and Voc of 584 mV for a reference device with a pristine TiO<sub>2</sub> electrode. In contrast to the Zn(NO<sub>3</sub>)<sub>2</sub>-modified TiO<sub>2</sub> electrode, the power conversion efficiency of the device with Cu(NO<sub>3</sub>)<sub>2</sub>-modified TiO<sub>2</sub> was sharply decreased, due to an increased interfacial charge recombination.
2P-518 Fabrication of ZnO μ-rods and photovoltaic properties of solar cells with them
최근영,류경범,박성주,윤상훈,성혜경,조성일,김지영,한윤수 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
ZnO microrods with a thickness of about 8 ~ 18 μm have been prepared by chemical bath deposition technique for applications to photoelectrodes of dye-sensitized solar cells (DSSCs). With increasing the thickness of ZnO microrods, the open circuit voltage (Voc) values of the DSSCs were increased, but a decrease in the short circuit current (Jsc) was observed in over 8hr of dipping time in zinc nitrate solution. By monitoring changes in dark current and electrochemical impedance, it was revealed that the increase in Voc was attributed to the suppression of the charge recombination between injected electrons and I<sub>3</sub><sup>-</sup> ions, probably due to an reduction in the surface area of ZnO microrods. This reduction of the surface area would lead to a decrement of dye contents adsorbed on ZnO microrods, resulting in the decreased Jsc value.