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Oh, Yulin,Lim, Ju Won,Kim, Jae Geun,Wang, Huan,Kang, Byung-Hyun,Park, Young Wook,Kim, Heejun,Jang, Yu Jin,Kim, Jihyeon,Kim, Dong Ha,Ju, Byeong-Kwon American Chemical Society 2016 ACS NANO Vol.10 No.11
<P>In this study, we demonstrate a viable and promising optical engineering technique enabling the development of high-performance plasmonic organic photovoltaic devices. Laser interference lithography was explored to fabricate metal nanodot (MND) arrays with elaborately controlled dot size as well as periodicity, allowing spectral overlap between the absorption range of the active layers and the surface plasmon band of MND arrays. MND arrays with,-,91 nm dot size and similar to 202 nm periodicity embedded in a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) hole transport layer remarkably enhanced the average power conversion efficiency (PCE) from 7.52% up 10.11%, representing one the highest PCE and degree of enhancement (similar to 34.4%) levels compared to the pristine device among plasmonic organic photovoltaics reported to date. The plasmonic enhancement mechanism was investigated by both optical and electrical analyses using finite difference time domain simulation and conductive atomic force microscopy studies.</P>
임주원,( Yulin Oh ),( Jae Geun Kim ),( Young Wook Park ),( Heejun Kim ),( Yu Jin Jang ),( Jihyeon Kim ),( Byeong Kwon Ju ),김동하 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Metallic nanodots (MNDs) have been widely utilized for the development of high-performance organic photovoltaic (OPV) cells by amplifying light absorption at the active layer. In this study, promising optical engineering which enables the development of high-performance OPV was demonstrated. We elaborately control the size and periodicity of the MND arrays via laser interference lithography. The MND arrays can induce the spectral overlap between the absorption range of the organic semiconductors and the plasmon resonance of MNDs. As a results, MND arrays led to a remarkable enhancement in power conversion efficiency up to 10.55 % from 7.2 % compared with control device. Near field enhancement and light scattering effect are responsible for the significantly improved device performance.
Yeum, Jeong H,Park, Sung M,Kim, Jong W,Choi, Jin H,Han, Sang I,Oh, Weontae,Cheong, In W,Deng, Yulin SAGE Publications 2014 Journal of composite materials Vol.48 No.18
<P>Microspheres of poly(vinyl acetate)/poly(vinyl alcohol)/disperse dye composite were prepared through suspension polymerization followed by the heterogeneous saponification. The effects of disperse dye on the rate of polymerization and saponification of poly(vinyl acetate) were studied. It was found that the rate of polymerization of poly(vinyl acetate) decreased when the concentration of the disperse dye increased. Also, the rates of poly(vinyl acetate) saponification decreased dramatically by the addition of disperse dye. The presence of disperse dye has almost no effect on the microsphere morphology.</P>