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짧은 채널 효과의 억제를 위한 ISRC (Inverted-Sidewall Recessed-Channel)구조를 갖는 0.1$\mu\textrm{m}$ nMOSFET의 특성
류정호,박병국,전국진,이종덕 대한전자공학회 1997 電子工學會論文誌, D Vol.d34 No.8
To suppress the short channel effects in nMOSFET with 0.1.mu.m channel length, we have fabricated and characterized the ISRC n MOSFET with several process condition. When the recess oxide thickness is 100nm and the channel dose for threshold voltge adjustment is 6*10$^{12}$ /c $m^{-2}$ , B $F_{2}$$^{+}$, the maximum transconductance at $V_{DS}$ =2.0V is 455mS/mm and the BIDL is kept within 67mV. By comparing the ISRC n MOSFET with the conventioanl SHDD (shallowly heavily dopped drain) nMOSFET, we verify the suppression of short channel effects ISRC structure.e.
Polymerized complex법에 의한 ZnWO<sub>4</sub> nanopower의 제조
류정호,임창성,오근호,Ryu, Jeong-Ho,Lim, Chang-Sung,Auh, Keun-Ho 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.3
착체중합법을 사용하여 nano-size의 ZnWO$_4$ powder를 제조하였다. 금속이온물질로서 znic nitrate와 tungstic acid를 사용하였으며 용매는 ethylene glycol을 사용하였다. 300$^{\circ}$C부터 600$^{\circ}$C의 온도 영역에서 하소한 분말에 대해 열분해 및 결정화 과정, 분말의 형상, 입도 변화 양상을 분석하였다. 일반적인 고상합성시에 필요한 온도보다 현저히 낮은 온도인 400$^{\circ}$C에서 ZnWO$_4$상이 생성되었으며, 600$^{\circ}$C에서 완전한 경정상을 얻을 수 있었다. 합성된 분말은 400$^{\circ}$C와 500$^{\circ}$C에서 원형과 silk-worm 형태가 혼합된 입자 형상을 나타내었고, 600$^{\circ}$C에서보다 균질한 양상을 나타내었다. 합성된 분말의 입자 크기는 400$^{\circ}$C∼600$^{\circ}$C의 온도영역에서 19.9∼24.2nm 정도로 매우 미세하였으며, 하소 온도가 증가함에 따라 분말의 결정상과 입도가 증가하는 것을 확인하였다. ZnWO$_4$ nano-powders were successfully prepared by polymerized complex method using zinc nitrate and tungstic acid as starting materials. In order to investigate the thermal decomposition and crystallization process, the polymeric precursors were heat-treated at temperatures from 300 to 600$^{\circ}$C for 3 h, and the heat-treated powders were characterized by XRD and FTIR. The surface morphology of the heat-treated powders were observed using SEM and TEM. The crystallite size was measured by X-ray analysis. Crystallization of the ZnWO$_4$ powders were detected at 400$^{\circ}$C and entirely completed at a temperature of 600$^{\circ}$C. The particles heat-treated 400 and 500$^{\circ}$C showed primarily co-mixed morphology with spherical and silkworm-like forms, while the particles heat-treated at 600$^{\circ}$C showed more homogeneous morphology. The average crystalline size were 19.9∼24.nm showing an ordinary tendency to increase with the temperatures from 400 to 600$^{\circ}$C.
Green upconversion luminescence of Yb3+, Er3+ codoped NaLa(MoO4)2 phosphors
류정호,강석현,심광보 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3
The upconversion (UC) luminescence properties of polycrystalline Er3+/Yb3+ co-doped NaLa(MoO4)2 phosphors synthesized bya simple solid-state reaction method were investigated in detail. Under 980 nm excitation, Er3+/Yb3+ co-doped NaLa(MoO4)2exhibited weak red emissions near 660 and670 nm, and strong green UC emissions at 530 and550 nm corresponding to theintra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2) → Er3+ (4I15/2). The optimum doping concentration of Er3+ and Yb3+ for highestemission intensity was determined by XRD and PL analysis. The Er3+/Yb3+ (7.0/10.0 mol%) co-doped NaLa(MoO4)2 phosphorsample exhibited strongly shiny green emission. A possible UC mechanism for Er3+/Yb3+ co-doped NaLa(MoO4)2 dependingon the pump power dependence was discussed in detail.