本研究以水熱法製備不同表面型態的氧化鋅奈米桿(ZnO Nanorods)，以SEM、XRD觀察其表面型態及晶相的改變，再利用奈米桿製備結構為ITO/ZnO nanorods/P3HT/Au之Hybrid太陽電池元件，探討其不同表面型態的氧化鋅奈米桿對於元件效能之影響。
我們主要探討四個部分，第一部分為氧化鋅奈米桿的間隙(spacing) 之影響。利用水熱濃度0.03M、0.04M及0.05M成長的奈米桿，奈米桿間隙分別為25nm、19.5nm及16.4nm。因為有機太陽電池之激子擴散長度小於20nm，間隙太大時有太多recombination現象。間隙太小則高分子不易進入。我們發現在奈米桿間隙為19.5nm時，可得最佳結果。
第二部分為奈米桿長度(length)的影響。在溫度90℃、95℃、105℃成長奈米桿，奈米桿長度分別為180nm、365nm及500nm。增加奈米桿長度可以增加junction area，提升電流，在奈米桿長度為500nm時，可得最大電流2.72mA/cm2。
第三部分探討在不同奈米桿長度下P3HT高分子覆蓋量的影響。我們發現，增加高分子覆蓋量可以有效改善漏電流現象，但高分子覆蓋量過高時，也會增加串聯電阻，降低JSC。
第四部分探討熱處理溫度與時間對元件的影響。熱處理可改善高分子與奈米桿的接觸，並提高高分子的結晶性，但過度的熱處理，反而會破壞高分子的結晶性，使JSC下降。
最後結果是，以水熱濃度0.04M，成長溫度95℃，成長時間2小時，所成長的氧化鋅奈米桿長度為365nm、間隙為19.5nm、P3HT高分子覆蓋量為280nm (濃度30mg/ml CB溶劑)，且元件熱處理條件為150℃、20分鐘，所製備得之Hybrid太陽電池，在AM1.5和GG400 Filter之下的光轉換效率為0.62%，Voc = 0.44V、Jsc = 2.52mA/cm2、Fill Factor = 50.30%。

In this thesis, we grow ZnO nanorods by the hydrothermal method, and use the ZnO nanorods to fabricate a hybrid solar cell with the structure of ITO/ZnO nanorod/P3HT/Au. SEM and XRD are utilized to analyze the morphology of ZnO and P3HT, and the crystallinity of P3HT.
The thesis consists of four parts. In the first part, we investigate the “spacing effect”. Since the exciton diffusion length of organic solar cell is about 20nm, we have to control the spacing to be smaller than 20nm, but the polymer can not get in if the gap is too small. We find that the optimum spacing to be 19.5nm.
In the second part, we discuss the “Length effect”. We controlled the length of nanorod by varying the hydrothermal temperature. At 90℃, 95℃ and 105℃, the results are 180nm, 365nm and 500nm, respectively. Increasing the nanorod length increases the junction area, and thus increases the photocurrent. The best photocurrent is found to be 2.72 mA/cm2 as the nanorod is 500 nm long.
In the third part, we discuss the effect of the amount of polymer to cover the ZnO nanorod with various thicknesses. We find that serious leakage current will occur if the amount of polymer is not enough to cover the nanorods, but the photocurrent decreases if too much polymers are accumulated on top of the nanorods, which will cause a high series resistance.
In the final part, we discuss the effect of temperature and time duration of annealing. Suitable annealing can improve the contact between the polymer and the nanorod, and also can enhance the crystallinity of the P3HT polymer. On the other hand, over-annealing will destroy the crystallinity of the polymer, and cause a decrease in photocurrent.
Overall, we have optimumized the device with the following parameters: with ZnO nanorod spacing at 19.5nm, the nanorod length at 365nm, the effective P3HT polymer thickness at 280nm (30mg/ml chlorobenzene), and the annealing time is 20min at 150℃, the ZnO nanorod based device shows that Voc=0.44V，Jsc=2.52mA/cm2，Fill Factor=50.30%，and the energy conversion efficiency is 0.62% under AM 1.5 solar illumination with a GG400 filter.

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