Int. J. Metrol. Qual. Eng.
Volume 5, Number 1, 2014
|Number of page(s)||5|
|Published online||22 September 2014|
Combined D-optimal design and generalized regression neural network for modeling of plasma etching rate
1 School of Microelectronics, Xidian
2 Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices, Xi’an 710071, P.R. China
3 School of Economics and Management, Xidian University, Xi’an 710071, P.R. China
Accepted: 24 April 2014
Plasma etching process plays a critical role in semiconductor manufacturing. Because physical and chemical mechanisms involved in plasma etching are extremely complicated, models supporting process control are difficult to construct. This paper uses a 35-run D-optimal design to efficiently collect data under well planned conditions for important controllable variables such as power, pressure, electrode gap and gas flows of Cl2 and He and the response, etching rate, for building an empirical underlying model. Since the relationship between the control and response variables could be highly nonlinear, a generalized regression neural network is used to select important model variables and their combination effects and to fit the model. Compared with the response surface methodology, the proposed method has better prediction performance in training and testing samples. A success application of the model to control the plasma etching process demonstrates the effectiveness of the methods.
Key words: D-optimal design / generalized regression neural network / response surface methodology / plasma etching rate
© EDP Sciences 2014
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