在本論文中主要探討採用氯鋁酞菁與碳七十為施體與受體，改變不同元件結構對於元件之短路電流(Short Circuit Current, Isc)、開路電壓(Open Circuit Voltage, Voc)、填充因子(Fill Factor, FF)的影響，進而最佳化元件結構製作出高功率轉換效率(Power Conversion Efficiency, PCE)的小分子有機太陽能電池。利用氯鋁酞菁對於紅外線的長波長吸收頻譜，加上碳七十吸收形成較寬的總吸收頻譜，進而增加光電流。透過平面混合結構，使得施體與受體介面大幅增加以提昇光電流，並藉由調變碳七十膜層厚度來調整光場分佈位置，以及調變混合層比例達到元件特性的改善。最後，藉由調整氯鋁酞菁膜層厚度來提昇開路電壓，達到高功率轉換效率的小分子有機太陽能電池。

In this thesis, we investigate that the influence of the device structure variation on the short circuit current, open circuit voltage and fill factor. We optimize the device structure to enhance the power conversion efficiency of the small molecule organic solar cell. We use chloro-aluminum phthalocyanine (ClAlPc) and C70 as donor and acceptor respectively and expect the wide absorption band of ClAlPc and C70 will increase the short circuit current. Through hybrid planar-mixed structure, the donor and acceptor materials allows the formation of more dissociation sites, where the excitons can be converted into free carriers and contribute to the photocurrents. We adjust the position of optical filed by changing thickness of C70 layer. Carrier mobility rises by tuning the thickness and the ratio of the mixing layer. We observe the improvement not only the efficiency but also the characteristic of devices. At last, we adjust the thickness of ClAlPc layer to improve the open circuit voltage and achieve high power conversion efficiency small molecule organic solar cell.

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