為開發合適的太陽能電池活性層(active layer)材料，本研究將共軛高分子P3HT及CeO2 奈米顆粒所形成的有機-無機複合材料進行表面/界面改質。區域規整共軛高分子P3HT具備優良導電性與結晶性，作為複合材料的電子供體(donor)；而氧化物CeO2因其優良的電子遷移率、熱穩定性以及其尺寸可控制性，則作為電子受體(accepter)。我們在製程中不同階段進行退火步驟，經由表面/界面改質，達到促進複合物中供體-受體間的界面電荷轉移作用。所採用的步驟包括: (1) 在形成複合材料前，將CeO2 奈米顆粒於不同氣氛下進行熱處理；以及 (2) 在形成P3HT/CeO2 NPs複合材料後，於不同溫度下進行熱處理。
實驗結果指出，P3HT/CeO2 NPs複合材料在經過所使用的兩種退火步驟後，CeO2 NPs尺寸及分布並無明顯變化，但拉曼與X光吸收光譜分析結果則顯示P3HT與CeO2間的交互作用有增強的現象。進一步利用光激螢光光譜(PL)估算材料之電荷轉移效率(?)，結果指出，P3HT/CeO2 NPs複合材料經適當的表面/界面改質後，樣品的電荷轉移效率可提升。若在形成複合材料前先將CeO2 奈米顆粒在空氣下進行退火，所得到的複合物其電荷轉移效率可由0.8提升到0.93；若在形成複合材料後於120°C下進行退火，則電荷轉移效率可提升至0.94。

In order to develop suitable active layer materials for solar cells, in this study, the surface/interface of P3HT/CeO2 organic-inorganic composite materials was modified by various annealing process. In this composite material, the regioregular conjugated polymer P3HT serves as an electron donor due to its excellent electrical conductivity and crystallinity, while CeO2 serves as an electron acceptor due to its excellent electron mobility, thermal stability and dimensional controllability. Different annealing process were carried out to promote the charge transfer between the donor-acceptor interfaces, which included: (1) heat treatment of CeO2 nanoparticles in different atmospheres before the formation of composite material; and (2) heat treatment at different temperatures after the P3HT/CeO2 NPs composite material is formed.
The experimental results showed that the annealing process did not resulted in significant changes in the size and distribution of CeO2 NPs in the composite material. However, both Raman and X-ray absorption spectroscopy analysis indicated that the interaction between P3HT and CeO2 was enhanced. The charge transfer efficiency (?) of the material was estimated according to the photo-induced fluorescence spectroscopy (PL) results. It is demonstrated that with the annealing of CeO2 nanoparticles in air before composite formation, the charge transfer efficiency of the composite can be enhanced from 0.8 to 0.93. The annealing the composite at 120°C could further enhance the charge transfer efficiency to 0.94.

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