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에피택셜 VO<SUB>2</SUB> 박막의 상전이에 대한 미시적 이해
김동욱(Dong-Wook Kim),손아름(Ahrum Sohn) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.3
We investigated configuration of metallic and insulating domains in VO2 thin films, while spanning metalinsulator phase transition. Kelvin probe force microscopy, of which spatial resolution is less than 100 nm, enables us to measure local work function (WF) at the sample surface. The WF of VO2 thin films decreased (increased) as increasing (decreasing) the sample temperature, during the phase transition. The higher and lower WF regions corresponded to the insulating and metallic domains, respectively. The metallic fraction, estimated from the WF maps, well explained the temperature-dependent resistivity based on the percolation model. The WF mapping also showed us how the structural defects affected the phase transition behaviors.
Ag 나노입자와 나노홀 배열구조를 이용한 초박형 단결정 Si 태양전지의 광흡수 증진
김수정(Sujung Kim),조윤애(Yunae Cho),손아름(Ahrum Sohn),김동욱(Dong-Wook Kim) 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.2
We investigated the influences of Ag nanoparticle (NP) arrays and surface nanohole (NH) patterns on the optical characteristics of 10-μm-thick c-Si wafers using finite-difference time-domain (FDTD) simulations. In particular, we comparatively studied the plasmonic effects of both monomer arrays (MA) and heptamer arrays (HA) consisting of identical Ag NPs. HA improved the optical absorption of the c-Si wafers in much wider wavelength range than MA, with the help of hybridized plasmon modes. The light trapping capability of the NH array pattern is superior to that of the Ag plasmonic NPs. We also found that the addition of the Ag HA on the wafers with surface NH patterns further enhanced optical absorption: the expected short-circuit current density was as high as 34.96 mA/㎠.