High temperature annealing of bent multicrystalline silicon rods

• DOI: 10.1016/j.actamat.2012.08.049
• Publication Date: 2012-10-01T18:16:26Z
• Authors: Torunn Ervik; Maulid Kivambe; Gaute Stokkan; Birgit Ryningen; Otto Lohne
• Keywords: Rod

Abstract Dislocation etch-pit structures on multicrystalline silicon rods deformed at 900 °C in four-point bending were studied prior to and after a high-temperature annealing. After deformation, the majority of the dislocation etch-pits were aligned along traces of {1 1 1} planes. Certain localized areas revealed network structures, where etch-pit arrays deviated in the range of 2-10° from the {1 1 1} plane traces. After annealing at 1350 °C for 12 h, a marked change in dislocation density and structure which varied from grain to grain was observed. Some grains showed incomplete polygonized structures, with notable irregularities and Y-junctions. The results were compared with observations on as-cast industrial multicrystalline silicon wafers for solar cells, where similar incomplete polygonized structures can be found.