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Ce has been introduced into the Si single crystal by means of vacuum deposition of Ce onto a Si wafer and then annealing at 1050℃ for 20 hours in vacuum.In the annealing process, Ce-Si alloy was formed on the surface at first, then Ce atoms were diffused into Si and produced a diffusion region with thickness about 4.5μm. The concentration profile of Ce was dedermined by SIMS. The diffusion coefficient of Ce in Si at 1050℃ was obtained as 3.9×10-13 cm2/s while the average resistivity P of the Ce diffusion layer was measured from 77K to 450K. 相似文献
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稀土元素Yb在1050℃扩散30分钟,已被引进硅中.它在P型硅中形成两个空穴陷阱Ev+0.38eV和 Ev+0.49cV,在N型硅中形成一个电子陷阱 Ec-0.33eV.它们的电激活浓度都在10~(13)cm~(-3)量级. 相似文献
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用Q开关Nd:YAG脉冲激光辐照淀积在Si上的稀土元素Yb,当输出能量密度≥6.0J/cm~2时,成功地把Yb引入Si中.用二次离子质谱(SIMS)分析指出进入Si中Yb的表面浓度为3 ×10~(11)/cm~3,在离表面 0.75μm处,浓度仍有 7 ×10~(19)/cm~3. 相似文献
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