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- W2094446557 abstract "InAs/GaSb (8/8-ML) 응력초격자 (SLS)의 성장 변수를 최적화하기 위하여, 다양한 조건 및 모드에서 SLS 구조를 제작하여 고분해능 X선회절 (XRD) 특성을 분석하였다. 본 연구에서는 성장온도, V/III 분자선 비율, 성장일시정지 (growth interruption, GI) 등의 변화를 통하여 SLS 계면층의 응력 변조를 유도하였고, XRD 0차 위성피크의 변위로서 응력의 변화를 고찰하였다. XRD 분석 결과로부터, SLS의 결정성과 응력의 변화를 유발하는 주요 변수는 각각 성장온도와 V/III(Sb/Ga) 비율임을 보여 주었다. 압축변형을 가지고 있는 본 연구에서 제작한 SLS 시료는 V/III(Sb/Ga) 비율의 감소에 따라 인장변형으로 전환됨을 보여 주었으며, GI 모드 및 시간에 따라 응력이 민감하게 변함을 관측할 수 있었다. 본 연구 결과로부터, [InAs/GaSb]-SLS ([8/8]-ML)의 최적 성장온도와 V/III(Sb/Ga) 비율는 각각 <TEX>$350^{circ}C$</TEX>와 20이고, 결정성을 극대화하고 응력완화를 감소시키기 위해서는 InAs 성장 직전 약 3초 동안의 GI방법이 유효함을 보였다. For the growth optimization of InAs/GaSb (8/8-ML) strained-layer superlattice (SLS), the structure has been grown under various conditions and modes and characterized by the high-resolution x-ray diffraction (XRD) analysis. In this study, the strain modulation is induced by changing parameters and modes, such as the growth temperature, the ratio of V/III beam-equivalent-pressure (BEP), and the growth interruption (GI), and the strain variation is analyzed by measuring the angle separation of 0th-order satellite peak in XRD patterns. The XRD results reveal that the growth temperature and the V/III(Sb/Ga) ratio are major parameters to change the crystallineity and the strain modulation in SLS structures, respectively. We have observed that the SLS samples with compressive strain prepared in this study are show a transition to tensile strain with decreasing V/III(Sb/Ga) ratio, and the GI process is a sensitive factor giving rise to strain modulation. These results obtained in this study suggest that optimized growth temperature and V/III(Sb/Ga) ratio are <TEX>$350^{circ}C$</TEX> and 20, respectively, and the appropriate GI time is approximately 3 seconds just before InAs growth that the crystallineity is maximized and the strain relaxation is minimized." @default.
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- W2094446557 date "2009-07-30" @default.
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- W2094446557 title "Study on Growth Optimization of InAs/GaSb Strained-Layer Superlattice Structures by High-Resolution XRD Analysis" @default.
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- W2094446557 doi "https://doi.org/10.5757/jkvs.2009.18.4.245" @default.
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