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This research has been studied a quality management method of silicon wafers for solar cells using the time series analysis. The model which can forecast conversion efficiency in state of a silicon wafer of a solar cell was presented newly and studied its limits. The first approach analyzed correlation between quality characteristics which was currently known and the quality of the last production. Also, The special factor which was unknown to a general factor until now was found. This paper presented the time series analytical model which was transformed in order to forecast exactly the influence that these special quality characteristics were immersed in to the conversion efficiency of cells. Using the correlation of forecasted value along the arbitrary change of measured value, the most optimized reduction factor for calculation of weight to be suitable for this model was defined.
