在本篇中我們準備了兩種新穎的受體-予體-受體高共平面性結構的小分子材料(BT4OT, BT6OT)，兩者都含有電子豐富的(BT)作為材料核心以及中間橋段用octylthiophene單位，最旁邊的終端接上電子缺乏的cyanoacetate單位。不同數量的octylthiophene單位會影響其光學，電化學，表面型態及太陽能電池的表現，此外BT4OT, BT6OT兩種材料因為擁有較低的最高未佔據電子分子軌域，所以會有較好的穩定度，以及在完成太陽能電池時會提供較大的開路電壓。我進行了多項的太陽能電池的參數調變測試，以利將太陽能電池優化到最好的表現，多項的參數調變如:找尋元件中主動層最適合的膜厚，測試在不同的熱退火溫度及不同時間長度下對元件的效能之影響，找尋受體材料與予體材料最恰當的混和比例，用我們的小分子材料去配對最適合的受體材料，再做成主動層的溶液中添加添加劑以改變其表面型態，用以獲得較大的電流及效能。我們得到最好的表現是在用BT6OT配對PC70BM以1:0.75的比例，以1wt%(v/v)配置在CHOLOFORM中，且加入0.25% vol的CN添加劑，所得的效率為5.05%，開路電壓為0.86伏特，短路電流密度為9.94(毫安培/公分2)，及填充因子為59.1%。

Abstract（in Chinese）………………………………………..I
Abstract（in English）……………………………………….III
Thanks（in Chinese）………………………………………..IV
Contents……………………………………………………….V

Chapter 1. Introduction….………………………………..1
1-1. Introduction and motivation………………………..1
1-2. Introduction of organic solar cells………………….6
Chapter 2. Small molecular and variables solar cells…..10
2-1. Mechanism of Small Molecular Solar Cell……….10
2-2. Important parameters of organic solar cell………..12
2-3. Small molecular BT4OT and BT6OT………...…..21
Chapter 3. Experimental detail
3-1. Device structure…………………………………...28

Chapter 4. Result and discussion
4-1. Device made by BT4OT and PC60BM: tuning the thickness of the active layer…………………………...32
4-2. Device made by BT4OT and PC60BM: effects of the thermal annealing on the active layer……………..…..35
4-3. Device made by BT4OT and PC60BM: blend ratio of the active layer………………………………………...39
4-4. Device made by BT4OT and PC60BM: blend ratio of the active layer………………………………………...42
4-5. Device made by BT6OT and PC60BM: effects of the different pre-annealing temperature…………………...45
4-6. Device made by BT6OT and PC60BM: Different pre-annealing time for pre-annealing……………….....48
4-7. The effect of different acceptors…………………..52
4-8. Device made by BT6OT and PC70BM: blend ratio of the active layer…………………………………….…..57
4-9. The effects of adding the different additives……...67
4-10. The mobility of charge carriers………………..…..71

Chapter 5. Summary……………………………………..75
Chapter 6. References………………………………..…..76

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