Study on impurity desorption induced by femtosecond pulse laser based on a stochastic process model |
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摘 要: | 1 Introduction With the rapid shrinkage of semiconductor device size, the device failure induced by the impurity molecules and the residue water adsorbed on the substrate becomes a sig-nificant and persistent problem in micro/nanoscale devices. For instance, the impurity molecules on a solid thin film from physical or chemical processes during fabrication may lead to defects in the structure and lower the quality of the thin film1]. Another ex-ample is the stiction-related device failure. Wit…
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收稿时间: | 3 December 2004 |
修稿时间: | 6 December 2005 |
Study on impurity desorption induced by femtosecond pulse laser based on a stochastic process model |
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Authors: | CHI Yinsheng LIN Xiaohui ZHUANG Ping CHEN Yunfei |
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Affiliation: | 1. Department of Mechanical Engineering, Southeast University, Nanjing 210096, China 2. Department of Mechanical Engineering, Southeast University, Nanjing 210096, China;Key Laboratory of MEMS of China Educational Ministry, Southeast University, Nanjing 210096, China |
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Abstract: | With the advantages on non-equilibrium heating and desorption induced by electronic transition, the femtosecond pulse laser introduces a new way for solving the problem of impurity pollution adsorbed on a solid thin film in micro-electro-mechanical systems (MEMS). A model based on stochastic processes was established for stimulated desorption induced by the femtosecond pulse laser to interpret the interaction of the opti-cally excited hot electrons with the adsorbed molecules in a metal substrate. Numerical simulation results reveal a time-dependent desorption probability of adsorbed molecules and indicate that how key parameters of femtosecond pulse laser, such as incident laser energy flux, pulse duration, and wavelength of pulse, have a great effect on the desorption probability. |
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Keywords: | desorption femtosecond pulse laser stochastic process |
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