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1. 中国科学院上海冶金研究所
2. 美国加州大学圣地亚哥分校
Published:1990
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[1]方芳,L.C.Wang,S.S.Lau.Ti扩散势垒对Al/Si/Pd与n-GaAs欧姆接触热稳定性的影响[J].电子学报,1990(05):111-113+126.
Fang Fang. Influance of Ti Diffusion Barrier on Thermal Stability of Al/Si/Pd/GaAs Ohmic Contact[J]. Acta Electronica Sinica, 1990, (5): 111-113.
利用电子束蒸发依次将Pd
Si和Al淀积在掺杂浓度为2×10
13
cm
-3
的n型GaAs上
可以得到非合金、低阻的欧姆接触。比接触电阻率约为5×10
-6
·cm
2
。但经过高温(410℃)
长时间热退火后
样品的表面会出现明显不平整
比接触电阻率会明显增加
在Al和Si/Pd之间加入一层Ti作为扩散势垒会使欧姆接触的热稳定性变好。但只有在Al和Ti之间的反应没有完全耗尽Ti时
扩散势垒才起作用。
Pd
Si and Al were deposited on n-GaAs with concentration 2×1018cm-3 by electron beam evaporation. Non-alloying and low resistivity (ρc≈5×10-6Ωcm2) ohmic contacts were obtained. After high temperature (410℃)
long term annealing
sample surface was not smooth and the specific contact resistivity increased. The thermal stability will be enhanced if a layer of Ti diffusion barrier is added between Al and Si/Pd. However the diffusion barrier can be brought into action only if the reaction Ti and Al is not allowed to consume all the Ti during heat treatment.
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