共查询到18条相似文献,搜索用时 93 毫秒
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掺杂浓度对多晶硅纳米薄膜应变系数的影响 总被引:11,自引:0,他引:11
为有效利用多晶硅纳米薄膜研制MEMS压阻器件,本文对LPCVD多晶硅纳米薄膜应变系数与掺硼浓度的关系进行了研究,并利用扫描电镜和X射线衍射实验分析了薄膜的结构特点.结果表明:在重掺杂情况下,纳米薄膜的应变系数明显大于相同掺杂浓度下单晶硅的应变系数,而且掺杂浓度在2.5×1020cm-3左右时,应变系数具有随掺杂浓度升高而增大的趋势.对这种实验结果依据隧道效应原理进行了理论解释,提出了多晶硅压阻特性的修正模型. 相似文献
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本文报道了计算择优生长的多晶硅压阻灵敏度的统计平均理论,由此得到了〈100〉、〈110〉〈111〉、〈211〉、〈311〉、〈331〉等低指数晶向择优生长的p型和n型多晶硅的平均晶粒压阻系数.将这些结果应用到具有多重择优晶向的多晶硅材料,经过计算可进一步得到多晶硅力敏电阻的灵敏度.对于制作在矩形膜中心区域的一系列多晶硅电阻,实验得到的结果与理论分析的结果符合得很好.这些结果为多晶硅压阻型压力传感器的设计提供了有效的手段. 相似文献
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A phenomenological model is proposed of the piezoresistive effect in polysilicon films, taking account of film symmetry. The model employs the elastoresistance and the piezoresistance tensor. Average piezoresistance coefficients are calculated. They are found to agree well with previously reported experimental values for high doping levels. 相似文献
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The experiment results indicate that the gauge factor of highly boron doped polysilicon nanofilm is bigger than that of monocrystalline silicon with the same doping concentration, and increases with the grain size decreasing.To apply the unique properties reasonably in the fabrication of piezoresistive devices, it was expounded based on the analysis of energy band structure that the properties were caused by the tunnel current which varies with the strain change forming a tunnelling piezoresistive effect. Finally, a calculation method of piezoresistance coefficients around grain boundaries was presented, and then the experiment results of polysilicon nanofilms were explained theoretically. 相似文献
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The electrical properties of LPCVD silicon are shown to be optimised for microelectronic applications by depositing the films as an amorphous layer and annealing to yield a polycrystalline form. The film resistivity is lowered and the piezoresistive coefficient raised by this technique. These improvements are explained by a simple theory which incorporates trap density and grain size effects and also allows the temperature coefficients of resistance and gauge factor to be calculated. 相似文献
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采用分子束外延方法在砷化镓衬底上生长了AlAs/GaAs双势垒量子阱薄膜结构。介绍了量子阱薄膜在单轴压力作用下的压阻实验,测试出薄膜在压力影响下的I-V曲线,并分析了量子阱薄膜压阻效应的成因。通过实验证实了量子阱薄膜具有较高灵敏度的压阻效应,其压阻灵敏度比目前常用的多晶硅的压阻灵敏度提高一个数量级。 相似文献
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Electrothermally excited silicon beam mechanical resonators 总被引:2,自引:0,他引:2
Silicon micromechanical resonators are described which use a polysilicon resistor for both electrothermal excitation and piezoresistive sensing. By suitable design these devices may have a very low temperature coefficient of frequency and be used as both frequency references and pressure sensors. 相似文献
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R. Mahamdi F. Mansour H. Bouridah P. Temple-Boyer E. Scheid L. Jalabert 《Materials Science in Semiconductor Processing》2010,13(5-6):383-388
In this work we study the boron diffusion and its activation into recrystallized nitrogen doped silicon thin films (NIDOS) and we also discuss the influence of the chemical interaction between boron and nitrogen in NIDOS films. These films are deposited by low pressure chemical vapor (LPCVD) for the development of a P+ polysilicon gate for MOS structures. The reduction of boron diffusion with increasing nitrogen content is observed by SIMS profiles. SUPREM IV software is used in order to estimate the boron diffusion coefficients in NIDOS films. FTIR analyses show the appearance of a B–N complex whose density strongly depends on the annealing treatment in terms of temperature and duration. It is deduced through resistivity measurements and SEM observation that the formation of B–N complexes tends to degrade the electrical properties of polysilicon thin layers through the decrease of both electrically active boron and polycrystalline grains growth. 相似文献
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全面介绍了多晶硅薄膜晶体管(TFT)紧凑模型的现状和应用前景,简单说明了多晶硅TFT特有的电学特性,这是多晶硅TFT建模的基础,重点介绍了基于阈值电压和基于表面势的多晶硅TFT紧凑模型的研究进展,并对这些模型进行了评述,其中RPI模型是基于阈值电压的TFT模型的典范.虽然TFT模型已经有所发展,但成熟度还远远不够.最后提出了改进多晶硅TFT模型的方向和策略,包括二维器件模拟的应用、基于表面势模型的发展、多晶硅材料特性的应用、统一模型的发展、短沟效应的建模和参数提取等. 相似文献