為了提升太陽能電池效率，正面電極的改良一直是研究的重點，而如何有效的減少電極電阻，又不影響其結構強度，從電極和矽晶圓之間的微結構，再結晶銀的尺寸和數量對電性的影響可一窺端倪。為此，本研究藉著改變溫度、添加劑種類、金屬粉末比例，玻璃粉末比例，研究其微結構，且歸納出最佳的導電銀膠比例，最後實際測試電性做以應證。以SEM觀察微結構變化，實驗結果顯示，隨著溫度的上升，表面電極燒結致密度和銀-矽介面的再結晶銀尺寸會跟著向上提升，但含添加劑的試片，在較低溫度就能有相同的效果。玻璃粉末的增加，也會使再結晶銀的尺寸和數量上升，但當其比例過高時，除表面電極的空孔會增加，影響電極本身結構強度外，更會直接使得Isc短路電流下降，降低效率。討論前面實驗之結果，最後降低了玻璃含量，增加金屬粉末填充率，並選擇最佳的添加劑，燒結並做IV測試，再調整背電極鋁膠種類與燒結設備的參數，初步的優化已得到電池效率17.14%之產品，但銀膠的成本約只有市售商品75-80%。

In order to improve the efficiency of solar cells, the positive electrode

of improvement has been the focus of the study. How to reduce the

electrode resistance effectively, without affecting its structural strength.

Interface micro-structure between the eleode and the silicon wafer, and

recrystallization of silver can gives some result. In this study, change

temperature, types of additives, the proportion of metal powder and glass

powder proportion than observed the micro-structure. Than mix the best

proportion of conductive silver paste. Finally, test of the electrical

properties by IV-tester. Observation SEM of the micro-structural, the

experimental results show that the rises of temperature, the surface

electrodes sintered density and silver - silicon interface recrystallization

silver size will follow the increase, but add to some special additives

have the same effect at lower temperatures. Increase of the glass powder,

also make the size and number of crystalline silver rise, but when the

ratio is too high, the hole will increase on the electrode surface than

structural strength turns into low , and it makes Isc (short-circuit current)

decline, reduce cell efficiency directly. Discuss the results of previous

experiments that reduce the glass powder content, increasing the fill rate

of metal powders, and select the best additives, sintering temperature than

work the IV test. Next step adjust the back electrode aluminum plastic

types and the parameters of the sintering equipment. After preliminary

optimization, we got the cell efficiency of 17.14%, but the cost of the

silver paste only about commercial products 75-80%

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