Electronic characteristics of solar material improved by laser processing

In process of making polycrystalline sillicon solar cell material,the microstructure defect of material surface worsenes electric character of material and reduces minority carrier life because of ion injecting and maching.To solve this problem,the sillicon material was scanned by high power CO2 laser,and crystal extension was obtained and defect was eliminated in experiment.The block resistance of material surface was reduced and minority carrier life was increased.The type reversal of material scanned by laser was also analysed.