本論文之主要研究為以自組裝單分子層薄膜，修飾有機太陽能電池元件氧化銦錫電極表面；藉由不同官能基之自組裝單分子層薄膜分子成長於氧化銦錫基板上，可改變其表面潤濕性、表面功函數等性質，藉以了解其對元件光電轉換效率之影響。實驗結果顯示，以混合表面官能基為甲基及三氟甲基的單分子層薄膜分子修飾氧化銦錫電極表面，在最佳比例下，可得電池之光電轉換效率為2.56%。我們推測此光電效率得以增加之原因，為改變後之氧化銦錫電極表面可造成其上所塗佈之有機主動層有最佳結構與形貌。並且，混合單分子層提供了電極有最合適之表面功函數。另外，電池元件的光學性質亦受到單分子層的影響而提升。

This research is focused on the modification of the surface of the ITO electrode with self-assembled monolayers (SAMs) in organic solar cell. The surface wettability and the work function of ITO are altered by passivation of SAMs with different functional groups, and the correlation between surface modification and photocurrent conversion efficiency (PCE) of the cell is investigated. The highest PCE of 2.56% can be reached by utilizing solar cell which the ITO electrode was modified by a mixture of SAM molecules with –CF3 and –CH3 functional groups. We conclude that the highest PCE is resulted from the mixture SAMs on ITO electrode which provides optimized morphology and structure of organic active layer above, the suitable workfunction which affect the electron transport of the device, and the best optical properties of the solar cell.

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