O'Reilly logo

Handbook of Silicon Based MEMS Materials and Technologies by Teruaki Motooka, Ari Lehto, Markku Tilli, Veikko Lindroos

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

2.3. Issues of Crystal Growth

In the following sections, diameter control, doping, and HZ lifetime are discussed.

2.3.1. Diameter Control

There is a clear-cut balance between the growth rate of the crystal and thermal gradients on both sides of the freezing interface. The growing crystal needs to be cooled, mainly through radiation, and to some extent also by the purge gas flow. Near the freezing interface, the heat flux density can be taken to be equal to the magnitude of thermal gradient times thermal conductivity, on both sides of the interface. However, the solidification process releases heat at a rate that is equal to the speed of crystallization times latent heat. In a balanced situation, the external pull speed of the crystal is equal ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required