基于Monte Carlo方法的RIE工藝模擬
[Abstract]:Reactive ion etching (RIE) process is one of the most widely used techniques in MEMS processing. The computer simulation of rie can help process designers to change the simulation conditions, such as RF power, gas pressure, etching temperature, etc. Different simulation results were obtained to select the best process conditions. This is of great significance to reduce the design and development cost of MEMS devices and shorten the R & D cycle. In this paper, the characteristics of RF sheath are determined by using hydrodynamic model and sheath equivalent circuit model, including the voltage of sheath and the space-time distribution of electric field. The movement of ions and neutral particles in RF sheath was studied by using Monte Carlo method. The particle flux distribution which reached the surface of the etched material and was effective for etching was obtained. According to the particle flow distribution, the local etching rate at a certain point on the surface of the etched material is obtained by using the formula of etching velocity. Finally, the initial morphology of the etching profile is described by the level set function, and the evolution process of the etching profile is obtained by solving the Hamilton-Jacobi equation through the velocity field of the etched material surface. By changing different etching conditions, the etch profile with time is obtained, and the simulated etching profile is obtained under different RF power, different gas, different temperature, changing reaction gas. The simulation results show that in the range of 200W~400W, the increase of RF power can accelerate the etching rate, further increase the power, and decrease the etching rate, and with the increase of pressure, the etching rate increases and reaches the maximum value in 15Pa. Then the etching rate decreases and the etching rate is proportional to the temperature. Finally, the simulation results of reactive particle etching under certain technological conditions are compared with the experimental results, and the results are in good agreement with each other. The research in this paper shows that the level set algorithm is an efficient algorithm for simulating the evolution of plasma etching contour, and it can effectively describe various complex contours in the process of plasma etching simulation. It can well meet the needs of simulation of complex morphology evolution in plasma etching process. Although it has not been extended to three dimensions in this paper, the microphysical process of plasma etching is introduced into the level set method. It provides a new technical idea for solving the problem of large amount of simulation calculation in 3D plasma etching process in the future.
【學位授予單位】:東南大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TN305.7
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