摘要
本研究探討串接式CdS/CdSe量子點的載子動力學以及不同奈米氧化物材料對CdS/CdSe量子點敏化太陽能電池(QDSSCs)光電轉換效益影響。
首先使用連續離子吸附反應法(SILAR)和化學浴沉積法(CBD)，分兩階段成長串接式CdS/CdSe量子點。透過時間解析共軛焦螢光顯微系統以及飛秒瞬態吸收光譜儀分析，發現第一階段成長的CdS可有效遏制主要吸收層CdSe成長所產生的接面缺陷，且CdS/CdS所形成之階梯狀的能帶結構能夠有效增強光電子的注入及分離。進一步使用CdS/CdSe量子點搭配tetrapod-like氧化鋅 (t-ZnO) 奈米顆粒光陽極材料，製備成三明治結構的QDSSCs，並對電池元件量子點、光陽極膜厚、及電解液等進行一連串的優化，最終可以得到4.24%光電轉換效率。
研究第二部分以水熱法合成高比率(001)面的TiO2奈米板 (Nanosheets, NSs) 作為QDSSCs的光陽極材料，對比商用P-25 TiO2 奈米顆粒(nanoparticles, NPs)，同樣採用CdS/CdSe QDs作為光敏化材料，結果顯示高比例(001)面TiO2 NSs製備的電極元件在單位比表面積、孔隙度、及QDs吸附量等參數都有明顯提升。透過電化學阻抗分析儀做進一步分析，結果也顯示結晶性良好的二維結構能夠提供光電子較佳的傳輸效率，而良好的QDs吸附也減少TiO2/電解液接面電子再復合機率，最終元件光電轉換效率可達4.42%，對比P-25 NPs元件有54%提升。

Abstract
This thesis studied the carrier dynamics in cascade CdS/CdSe quantum dots and explored various metal oxide nanostructures for high-efficiency CdS/CdSe quantum dot sensitized solar cells.
The cascade CdS/CdSe quantum dots were synthesized via the successive ionic layer absorption and reaction (SILAR) and chemical bath deposition (CBD) processes. Analyses based on the femtosecond transient absorption and fluorescence decay measurements revealed that the preliminary CdS layer was not only energetically favorable to electron transfer but also behaved as a passivation layer to diminish the formation of interfacial defects during CdSe synthesis. The cascade CdS/CdSe quantum dots were then applied to the novel tetrapod-like ZnO nanoparticles to construct quantum dot-sensitized solar cells (QDSSCs). The cascade CdS/CdSe co-sensitized QDSSCs manifested better electron transfer dynamics and overall power conversion efficiency, compared to single CdS- or CdSe-sensitized cells. The resultant solar cell yielded a solar power conversion efficiency of 4.24% under simulated one sun (AM1.5G, 100 mW cm−2) illumination.
In the second part of the research, CdS/CdSe quantum dot-sensitized solar cells (QDSSCs) were fabricated on two types of TiO2 photoanodes, namely nanosheets (NSs) and nanoparticles. The TiO2 NSs with high (001)-exposed facets were prepared via a hydrothermal method, while the TiO2 nanoparticles used the commercial Degussa P-25. It was found that the pore size, specific surface area, porosity, and electron transport properties of TiO2 NSs were generally superior to those of P-25. As a result, the TiO2 NSs-based CdS/CdSe QDSSC has exhibited a power conversion efficiency of 4.42%, which corresponds to a 54% improvement in comparison with the P-25-based reference cell. This study provides an effective photoanode design using nanostructure approach to improve the performance of TiO2-based QDSSCs.

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