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RISS 인기검색어
- 검색키워드
- 저자 : Song Byong Gwon (검색결과 2 건)
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Quantitative analysis of nano-defects in thin film encapsulation layer by Cu electrodeposition
Chu, Kunmo,Bae, Ki Deok,Song, Byong Gwon,Kim, Jaekwan,Park, Yong Young,Xianyu, Wenxu,Lee, Chang Seung,Sohn, Yoonchul Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.453 No.-
<P><B>Abstract</B></P> <P>Thin-film encapsulation (TFE) is of great importance as a barrier film to protect organic devices and displays. A serious problem with the application of TFE is degradation of organic devices with penetration of oxygen and water vapor through pinholes having sub-micron size. Though many studies were tried to identify the pinholes, quantitative analysis of pinhole area has not been found yet. In this study, total pinhole area in TFE layer was quantitatively analyzed with the help of the Cu bumps electrodeposited on the pinholes. Empirical growth rate of the Cu bumps revealed that bump radius (r) and plating time (t) had a relationship of r<SUP>3</SUP> ∝ t. While size of the pinholes was deduced from starting point of Cu bump growth, number of the pinholes was extracted from size distribution of the Cu bumps. Unique feature of Cu bump morphology is also explained with a compositional analysis, demonstrating dissolution of Ni underlayer and its involvement in the formation of the Cu bumps.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Quantitative analysis of the pinholes in SiON thin film encapsulation is provided. </LI> <LI> Kinetic growth rate of electrodeposited Cu bumps on the pinholes was established. </LI> <LI> Pinhole size was deduced from the kinetic growth curve of the Cu bumps. </LI> <LI> Dissolved Ni underlayer involved in the formation of the Cu bumps. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Porous PVDF as effective sonic wave driven nanogenerators.
Cha, SeungNam,Kim, Seong Min,Kim, HyunJin,Ku, JiYeon,Sohn, Jung Inn,Park, Young Jun,Song, Byong Gwon,Jung, Myoung Hoon,Lee, Eun Kyung,Choi, Byoung Lyong,Park, Jong Jin,Wang, Zhong Lin,Kim, Jong Min,Ki American Chemical Society 2011 Nano letters Vol.11 No.12
<P>Piezomaterials are known to display enhanced energy conversion efficiency at nanoscale due to geometrical effect and improved mechanical properties. Although piezoelectric nanowires have been the most widely and dominantly researched structure for this application, there only exist a limited number of piezomaterials that can be easily manufactured into nanowires, thus, developing effective and reliable means of preparing nanostructures from a wide variety of piezomaterials is essential for the advancement of self-powered nanotechnology. In this study, we present nanoporous arrays of polyvinylidene fluoride (PVDF), fabricated by a lithography-free, template-assisted preparation method, as an effective alternative to nanowires for robust piezoelectric nanogenerators. We further demonstrate that our porous PVDF nanogenerators produce the rectified power density of 0.17 mW/cm3 with the piezoelectric potential and the piezoelectric current enhanced to be 5.2 times and 6 times those from bulk PVDF film nanogenerators under the same sonic-input.</P>
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