Patent ID: 7713848
Filing Date: 2010-05-11
Classification: C30B,H01L,Y02E,Y02P

Abstract:
1. A method of re-crystallization of a layer structure by means of zone melting, comprising: producing a plurality of linear meting zones using at least two heat sources; and producing relative movement of the heat sources relative to the layer structure such that: (i) the linear melting zones are drawn through the layer structure in a direction perpendicular to the linear melting zones, (ii) the linear melting zones are drawn simultaneously through the entire layer structure with an overlap in regions of the linear melting zones with already re-crystallized zones so that a continuous re-crystallization of the layer structure is ensured, wherein: a) in a first phase (melting phase), the at least two melting zones, in the direction perpendicular to the linear melting zones, are drawn through the layer structure simultaneously over a first stretch d+a and at a speed which enables a high crystal quality, d representing the spacing of two adjacent heat sources and a<d, b) the layer structure, in a second phase (transport phase), is moved over a second stretch (n−1)·d−b which is subsequent to the first stretch in the direction perpendicular to the linear melting zones and at a speed which is increased relative to the first phase, in which the layer structure is not melted, n representing the number of successively disposed heat sources and b being chosen such that the result is an overlap of the melting zones with the already re-crystallized zones, and steps a) and b) being repeated until there is continuous re-crystallization of the layer structure.