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DC 마그네트론 스펏터를 이용한 ITO 박막의 실온 증착 및 특성 분석
김호운(Howoon Kim),윤정오(Jung-Oh Yun) 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.1
최근 휴대용 통신기기와 스마트 디스플레이의 결합은 휴대가 용이하고 이동을 하면서 모든 작업을 할 수 있다. 이에 본 논 문에서는 휴대용 통신기기에서 저가격의 높은 투명전극을 찾기 위해 여러 가지 ITO(Indium Tin Oxide) 박막에 대해 연구하였다. ITO 박막은 DC 마그네트론 스펏터를 사용하였으며 1 분위기압을 1mTorr 증가 간격으로, 2 바이어스 전압은 10V 간격으로 변화시켜 측정하였다. 두께와 굴절율은 일립소미터를 사용하였으며 막의 단면과 표면의 형상은 주사전자현미경을 사용하여 조사하였다. 분석 결과를 통해 바이어스 전압이 300V 이상일 경우에 명확한 증착이 나타났으며 추가로 전압이 증가함에 따라 전체적으로 증착률이 증가하였다. 330V 조건에서 증착률이 가장 높았으며 뚜렷한 결정립이 관찰되었다. In this study, the characteristics of ITO thin film was investigated to finding a low cost and highly transparent electrodes for display of mobile communication devices. The ITO film was deposited by DC magnetron sputter. The experimental conditions were changed as follows: 1. ambient pressure changed 1 to 3 mTorr with 1mTorr step, 2. bias electric voltage changed with 10V step. The chamber was pumped out by rotary pump until 10<SUP>-3</SUP>Torr then the diffusion pump was used to lower the pressure of 10<SUP>-6</SUP>Torr. The results shows us the film growth was obvious when the bias voltage was larger than 300V, but the overall thickness tendency was existed: the more voltage is the thicker thickness. At 330V bias voltage condition, the deposition rate was the largest and apparent grain was showed.
황찬식,김강욱,윤정오 경북대학교 전자기술연구소 1998 電子技術硏究誌 Vol.19 No.1
H.263 has a hybrid compression technique using inter-picture prediction and transform coding of the remaining signal to utilize the temporal and spatial redundancies respectively. But the conventional basic mode algorithm of H.263 still has the problem in picture quality due to the high compression ratio. So it has been proposed to include four negotiable coding options: Unrestricted Motion Vectors(UMV), Syntax-based Arithmetic Coding(SAC), Advanced Prediction(ADV) and PB-frames(PB). In this paper, we analyze a performance of H.263 negotiable mode for image class. Experimental results show that blocking artifact is greatly reduced by using ADV mode for class B, C and fewer bits are produced by using SAC mode for all classes and the improvement of PSNR is obtained by using UMV mode for class C due to an extension of the motion vector range.