本研究以微乳化系統合成CdS量子點，並利用十二碳硫醇(dodecanethiol)及琥珀酸硫醇(Mercaptosuccinic acid，MSA)分子進行量子點表面改質，分別製作疏水性量子點粒子(C12-CdS)與含羧酸基的親水性量子點(MSA-CdS)，其中利用CTAB物理吸附於MSA-CdS可提高量子點的移動性，可利用LB沈積技術精確控制層數來製備多層的CdS量子點薄膜。此外，在TiO2組裝CdS量子點的太陽電池研究中，利用3-硫醇基矽丙烷(3-Mercaptopropyl trimethoxysilane，MPTMS)及3-胺基甲基二乙氧基矽丙烷(3-Aminopropylmethyl diethoxysilane，APMDS)對TiO2表面改質使TiO2具有硫醇基(-SH)與胺基(-NH2)，可與CdS反應提高CdS 量子點的吸附量，但易造成TiO2電極孔洞阻塞。而利用MSA-CdS直接利用羧基在未改質TiO2表面吸附形成單層且高覆蓋率結構，可避免阻塞TiO¬2孔洞與抑制暗電流發生。由IPCE效率分析顯示，於400nm光波長下以MSA-CdS直接吸附於未改質TiO2效率約20 %，而MPTMS與APMDS改質的TiO2吸附CdS則分別為13%及6%。在光電轉換總效率分析上MSA-CdS吸附於未改質TiO2效率可達0.30%，而CdS吸附於MPTMS與APMDS改質的TiO2¬則約為0.19%
另一方面，本研究亦利用PVDF-HFP高分子分別混摻TiO2、奈米碳管及石墨等無機奈米粒子製作膠態電解質，並組裝應用於太陽電池中，探討無機奈米粒子對電池轉換效率影響。實驗結果發現奈米粒子可降低高分子結晶度與減低離子移動活化能而提升導電度。由電化學阻抗分析發現，高分子混摻TiO2可改善膠態電解質與TiO2電極間的接著，但亦會導致白金電極界面電荷轉移電阻增加與漏電情形發生，而混摻奈米碳管與石墨粒子可抑制電子與電洞再結合發生，可提升光電流。在太陽電池光電轉效率分析中，PVDF-HFP未添加奈米粒子製備之電解質所測得的電池效率約為4.69%，而PVDF-HFP混摻0.5% TiO2奈米粒子效率可提升至5.19%；而混摻0.3%奈米碳管時為5.92%；而混摻0.2%石墨奈米粒子可將效率提升至6.04%，接近液態太陽電池的效率值。

In this study, Cadmium sulfide (CdS) quantum dots (QDs) were prepared by microemulsion process and surface modified by dodecanethiol or mercaptosuccinic acid (MSA) to render a surface with hydrophobic alkyl chains (C12-CdS) or hydrophilic carboxylic acid groups (MSA-CdS), respectively. For the MSA-CdS QDs, the surface was hydrophobized through physical adsorption of cetyltrimethyl ammonium bromide (CTAB) which improved the stability and mobility of the QDs at the air/water interface. The CTAB-MSA-CdS QDs could be used to prepare multilayer of CdS QD films using Langmuir-Blodgett (LB) technique. Moreover, the CdS was assembled onto TiO2 mesoporous surface for dye-sensitized solar cells (DSSCs) application. TiO2 was surface modified by 3-mercaptopropyl trimethoxysilane (MPTMS) or 3-aminopropyl-methyl diethoxysilane (APMDS), respectively, to prepare a thiol or amino terminated surface for binding with the CdS. The interaction of CdS to the thiol and amino groups leads to a higher adsorption amount of CdS. However, the fast adsorption rate leads to blocking of mesopores, resulting a poor performance of the cell. On the bare TiO2 film, CdS QDs have a lower adsorption rate and incorporated amount of CdS were obtained, but a better-covered QDs monolayer was resulted. The incident photon-to-current conversion efficiency (IPCE) obtained at 400 nm for the CdS-sensitized TiO2 electrode were about 20%, 13% and 6%for the bare-TiO2, MPTMS-TiO2 and APMDS-TiO2, respectively. The total energy conversion efficiency were 0.30% for bare TiO2, 0.19% for MPTMS-TiO2 and APMDS-TiO2.
On the other hand, the PVDF-HFP was blending with nanofillers (TiO2, carbon nanotube and graphite) to prepare polymer gel electrolyte (PGE) for DSSC application. Graphite nanoparticle was proved to be a more efficiency filler, than TiO2 and carbon nanotube, in enhancing the charge conductivity of the PGE, decreasing the activation energy for charge transport, and inhibit the charge recombination at the TiO2/electrolyte interface. The energy conversion efficiency of a DSSC fabricated using a PGE containing 0.25 wt% of graphite can be increased from 4.69% (without filler) to 6.04%, close to that of a liquid system obtained in this work.

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