Si ribbon, SiO2 ribbon and ultra pure ribbons of other substances

Abstract

A method of purifying substances is described herein, particularly suitable for purifying silica and forming it into silicon oxide sheets or ribbons, or silicon sheets or ribbons. The method includes ion sweeping a sheet of a substance containing ionic impurities by providing an ionic driving force and a thermal driving force. Ions are swept to a collectable region of the sheet. A system is also provided for purifying substances including an ion sweeping sub-system for providing an ionic driving force to a sheet or ribbon, and a heating sub-system positioned and configured for heating the sheet or ribbon. Impurities swept to an edge, surface or both are then mechanically or chemically removed.

Dependencies are inferred from the claim text.