近幾年來溫室氣體逐漸上升，全球暖化問題遽增，世界各國也開始訂定節能減碳目標，並紛紛投入潔淨能源發展，本研究依據目前世界各國較為引用的英國碳足跡標準PAS 2050「產品與服務溫室氣體排放生命週期評估規範」，以潔淨能源之一的太陽能多晶矽片製造廠為盤查對象，調查2010年7月至2011年6月期間產品碳足跡排放源並且量化，並針對量化結果加以分析，以瞭解太陽能多晶矽片廠產品碳足跡排放量與各個製程階段碳足跡排放量。 由研究結果顯示2010年7月至2011年6月期間，太陽能多晶矽片每一片碳足跡為3.162kg CO2e/片，原料取得碳排放量為2.13 kg CO2e/片占總排放量68%，在各製程階段主要碳排放源為長晶製程用電與切片製程輔助物料使用，長晶製程用電0.124 kg CO2e/片，切片製程輔助物料可分為切削液與切削粉使用，碳排放為0.11 kg CO2e/片與0.272 kg CO2e/片，此三部分為製程階段主要碳排放源，並針對製程主要碳排放源進行分析研擬節能減碳對策， 以單次長晶製程增加50公斤原料投入量以及切片製程中所使用的輔助物料提高使用回收料比率至50%等策略，推估共可降低0.188kg CO2e/片，總製程階段碳排放降低18.6%，總碳足跡可降低5.9%碳排放。 經由本研究對太陽能多晶矽廠進行碳足跡盤查後，瞭解盤查過程中遇到的問題與各製程階段碳排放的特性，以提供同產業進行碳足跡盤查時之參考。 Owing to the increase in greenhouse gas in recent years, the global warming becomes more severe. Many countries have set goals regarding energy-saving as well as carbon-reduction, devoted in the development of clean energy. Based on a carbon footprint standard of PAS 2050 Specification for the Assessment of the Life Cycle Greenhouse Gas Emissions of Goods and Services which is developed by United Kingdom and widely applied in most countries, the objective of this work is to examine the carbon foorprint of each manufacture unit of a multi-crystalline-solar-wafer plant. The data were collected from July, 2010 to June, 2011. The results reveal that during the investigation period, the carbon emission of solar wafer was 3.162kg CO2e/piece, and the carbon emission from raw materials was 2.13 kg CO2e/piece, accounting for 68% of the total emission. The major carbon emissions came from the electric consumption in crystallization processes and the supplemental material used in slicing process. The carbon emission of electric consumption in crystallization process was about 0.124 kg CO2e/piece, and the of the supplemental materials included cutting fluid and cutting powder, with their carbon emission are 0.11 kg CO2e/piece and 0.272 kg CO2e/piece, respectively. These three stages generated the most carbon emission. Based on the investigation, it was also found that by increasing 50 kg raw materials per batch and recycling 50% more supplemental materials in slicing process, the carbon emission would be reduced to 0.188kg CO2e/piece, which is 18.6% the total carbon emission and 5.9% of the total carbon footprint.
