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中国科学技术大学 精密机械与精密仪器系,安徽 合肥,230027
收稿日期:2010-03-26,
修回日期:2010-06-22,
网络出版日期:2011-01-22,
纸质出版日期:2011-01-22
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荣皓, 赵钢, 褚家如. 用于热机械微纳加工的掺Al多晶硅加热器[J]. 光学精密工程, 2010,19(1): 124-131
RONG Hao, ZHAO Gang, CHU Jia-ru. Al doped poly-Si micro-heater for thermomechanical fabrication of micro/nano structure[J]. Editorial Office of Optics and Precision Engineering, 2010,19(1): 124-131
荣皓, 赵钢, 褚家如. 用于热机械微纳加工的掺Al多晶硅加热器[J]. 光学精密工程, 2010,19(1): 124-131 DOI: 10.3788/OPE.20111901.0124.
RONG Hao, ZHAO Gang, CHU Jia-ru. Al doped poly-Si micro-heater for thermomechanical fabrication of micro/nano structure[J]. Editorial Office of Optics and Precision Engineering, 2010,19(1): 124-131 DOI: 10.3788/OPE.20111901.0124.
针对热机械式微纳米结构的加工
提出了一种以掺Al多晶硅为材料
集成于微悬臂梁上的加热器。采用Al诱导退火晶化(AIC)方法
在750 K对Al/a-Si∶H复合薄膜低温晶化18 h
制备出掺Al多晶硅。通过低温退火
使复合薄膜的拉曼特征峰由478 cm
-1
移至520 cm
-1
完成由非晶硅向多晶硅的转变;由四探针仪测得室温下样品的电阻率由退火前的10
10
cm降至16.810
-3
cm
实现了多晶硅的Al掺杂;在扫描电镜下观测到退火后Al与a-Si∶H层的界限消失并形成一层均匀的薄膜;这些结果表明得到了晶化程度很高的Al掺杂多晶硅。继而研究了掺Al多晶硅与氮化硅悬臂梁的集成工艺
采用微加工方法将掺Al多晶硅制成微加热器。使用ANSYS软件仿真加热器的工作过程
在10 V
0.3 s脉冲驱动下
加热器升温至782.8 K
降温时间约1 s。仿真分析显示
采用AIC法制得的掺Al多晶硅具有良好的热电特性
符合用于对高分子材料进行热机械微纳加工的微加热器的性能要求。
For thermomechanical fabrication of the micro/nano structure
a micro-heater made of Al doped poly-Si was fabricated. The Al doped poly-Si film was prepared by annealing from Al/a-Si∶H compound film under 750 K for 18 h on a Si
3
N
4
substrate using Aluminium Induced Crystallization (AIC) process
and the characteristics of the transformation caused by annealing were analyzed by Raman scattering spectroscopy
scanning electron microscopy and a resistivity meter. It was shown that the boundary between an Al layer and an a-Si∶H layer disappears after annealing
and a uniform film is formed. After annealing
the Raman spectral peak shifts from 478 cm
-1
to 520 cm
-1
which means the film surface changes from the a-Si∶H to the highly-crystallized poly-Si. Meanwhile
the resistivity of the film declined is from over 10
10
cm to 16.810
-3
cm at 300 K for doping of Al atoms. The results indicate that the bilayer film (Al/a-Si∶H) has been changed into a uniform Al doped highly-crystallized ploy-Si film. Furthermore
the integration of the Al doped poly-Si micro-heater and Si
3
N
4
cantilever was also discussed. Simulated by ANSYS
the micro-heater is heated to 782.8 K under a periodic electrical pulse with a voltage of 10 V and duration of 0.3 s. When the pulse disappears
its temperature cools down to 420 K within 1 s. The simulation results show that the Al doped poly-Si micro-heater has good thermoelectric properties
and it is well suitable for the thermomechanical micro/nano structure fabrication.
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