ENGLISH

Presentation of the Electrical Molten Zone (EMZ) Technique

By João Henriques

Book information

Publisher
Universidade de Lisboa
Year
2002
Language
english
Format
PDF
Filesize
2 MB (1919745 bytes)
Pages
32\32
Time added
2016-09-16 19:08:31
Magnetic fields; Morphological stability; Recrysta

Description

This article presents a new zone melting crystallization technique for photovoltaic silicon ribbonproduction. It starts by showing some background research on related methods concerning, inparticular, to ways of achieving and moving electrical molten zones (EMZ). It presents thefundamental mechanism responsible for the electric current concentration, which allows zoneformation. Demonstrates the possibility of zone melting recrystallization (ZMR) through thistechnique and shows growth rates and energy consumptions that can be expected of it. It exposesideas and results of the first attempts to obtain silicon ribbons using commercial (granular)feedstock. The electrical characteristics and control methods of the system are shown as well as therelated temperature distributions in the ribbons. It reveals the existence of interfacial instabilityphenomena, which is thought to be of magnetohydrodynamic (MHD) origin, thus (tentative)explanations for those are illustrated by analogy with typical occurrences observed (in othercontexts) in tubes of electrically conducting fluids.

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