太陽能電池的瑕疵種類繁多，任何瑕疵都有可能降低電池的光電轉換效率，使整個太陽能系統的發電效率受到影響。所有類型瑕疵中，以出現在電池內部的隱裂及汙染缺陷最為關鍵。可見光並無法查覺隱藏於電池內部的瑕疵，因此最不容易被檢查出來。電致發光(Electroluminescence, EL)技術最常被用來檢查太陽能電池的內在缺陷，本研究為找出電致發光缺陷發生的真正原因，提高生產的良率及降低客訴率，使品質能與其他公司競爭，電致發光缺陷改善是太陽能電池製造商優先要改善的項目之一。
本研究利用六標差管理系統的界定、衡量、分析、改善、控制(Define-Measure-Analyze- Improve-Control)DMAIC改善流程，針對太陽能電池電致發光不良率進行改善，在界定階段確定改善方向在生產製程，在衡量階段定義透過柏拉圖列出前兩大的電致發光缺陷，於分析階段用要因分析圖找出可能因子
，改進階段以實驗設計(Design of Experiment, DOE)找出最佳製程參數並進行放量確認，控制階段將實驗所得之最佳製程參數製作作業標準書，投入各機台平行展開進行量產，電致發光不良率由原先超過3,000ppm能夠下降至1,000ppm以下，電致發光不良率改善達50%以上。電致發光不良率改善後，讓個案公司的太陽能電池發電效率與良率也同步有所提升，再加上降低客訴比例，減少客訴產生的退換貨及重工作業成本下降，改善後總效益平均每個月金額322萬。

There are various types of defects in solar cells and these defects may reduce the photoelectric conversion efficiency of the battery and affect the power generation efficiency of the entire solar system. The cracks appearing inside the battery and pollution defects are the most critical among all types of defects. However, visible light is difficult to determine the hidden defect of inside the battery. Therefore, Electroluminescence (EL) technology is applied to examine the internal defects of solar cells.
In this study, DMAIC (Define-Measure-Analyze- Improve-Control) of Six Sigma framework is utilized. The improvement direction of production is defined according to the Define stage, and then the Measure phase lists top two electroluminescence defects in accordance with the Pareto chart. Further, the potential factors are figured out using cause and effect analysis chart at Analyze stage. The Design of Experiment (DOE) enables determining the optimal process parameters and confirms to scale up production in Improve stage. Finally, the standard operation procedure is prepared according to optimal process parameters obtained from experiments and the mass production is performed on parallel development of machines at Control stage.
The defect rate for electroluminescence has at least 50% improvement. After the improvement of electroluminescence, the power generation efficiency of solar cell and yield rates in the case company have been enhanced. In addition, the customer complaints and the cost of returning/replacing are effectively reduced to save 3.22 million NTD per month in the case company.

中文部分

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