Analysis and Automation of the crucible-free Floating Zone (FZ) Growth of Silicon Crystals

Idioma: inglés

Editorial: Epubli Jun 2014, 2014

3844294678 / 9783844294675

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Librería: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, AlemaniaBuchWeltWeit Ludwig Meier e.K.

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This item is printed on demand - it takes 3-4 days longer - Neuware -Considering the high relevance of electronics in the industrial, technological and business communities,monocrystalline silicon is one of the most important technical materials today and in the near future.To grow the monocrystalline silicon industrially with the required quality, the Czochralski and the crucible-free Floating Zone methods are generally used.The thesis is focused on the model-based automation of the crystal growth of silicon using Floating Zone technique. Automatic growth control is a key issue in production of silicon with respect to yield, quality, and reproducibility.Also, reliability and comparability are enhanced by growth control.In an industrial setting, it is essential to produce crystals with equal properties by keeping identical processing conditions.In today's industrial production, standard PI or PID controllers are applied to regulate the Floating Zone process. Due to the changing dynamics during the process, the controller parameters are set up separately for every phase of the process.In contrast, a model-based controller gives a widely flexible handling of different machine components, different inductor types and different target diameters.Therefore, a model-based automation concept was developed to regulate the Floating Zone process including the following phases: forming the feed tip, creating the thin neck, making the cone and growing the cylinder. A measurement system was created to obtain the geometrical quantities based on visual image processing.Digital cameras were applied to capture the process.The acquired images were analyzed by gradient-based methods.A model-based state estimation technique, the Extended Kalman filter, and a model predictive controller were implemented to regulate the processwithout using additional controller components such as a PID controller.To use those methods, a nonlinear low-order model was developed including geometrical and thermodynamical aspects of the process.The mathematical model is based on a system of coupled differential equations and allows the prediction of radii and angles of feed and crystal, upper and lower zone heights, the melt volume, the melt neck, and the rates of melting and growing. A prediction horizon of several minutes is achieved with high accuracy and a calculation time less than one second. 144 pp. Englisch.…

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Detalles bibliográficos

Título
Analysis and Automation of the crucible-free Floating Zone (FZ) Growth of Silicon Crystals
Autor
Nico Werner
Editorial
Epubli Jun 2014
Año de publicación
2014
Estado
Neu
Encuadernación
Taschenbuch
Idioma
inglés
ISBN 10
3844294678
ISBN 13
9783844294675
Peso del artículo
194 gramos
Dimensiones
210x148x8 mm

BuchWeltWeit Ludwig Meier e.K.

Bergisch Gladbach, Alemania

Vendedor de 5 estrellas

Vendedor de IberLibro desde 11 de enero de 2012

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BuchWeltWeit Ludwig Meier e.K.

Alemania