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標題: | 金奈米粒子摻雜於染料敏化太陽能電池之二氧化鈦光電極的應用與研究 The Effect of Gold Nanoparticle Incorporation in the TiO2 Photoanodes for Dye-Sensitized Solar Cells |
作者: | Ching-Wen Hsu 許瀞文 |
指導教授: | 陳奕君(I-Chun Cheng) |
關鍵字: | 染料敏化太陽能電池,二氧化鈦,金奈米粒子,侷域性表面電漿共振,光散射效應,電子傳輸, Dye-sensitized solar cell,TiO2,Au nanoparticles,localized surface plasmon resonance,light scattering effect,electron transfer, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 本研究主要探討奈米金粒子摻雜於染料敏化太陽能電池之二氧化鈦光電極之效應。奈米金粒子和二氧化鈦奈米粒子間存在侷域性表面電漿共振效應,其效應可增強奈米金粒子鄰近之電磁場強度(約10奈米),進而提升光電極之光吸收率。此外、由電化學阻抗頻譜可得知,金奈米粒子可以有效減少電子在二氧化鈦光電極傳輸時的內部阻抗,即二氧化鈦/染料分子/電解液的接面阻抗,並且提升電子傳播的速度。
本研究提出了三種摻雜奈米金粒子的結構: (1) 吸附金的二氧化鈦結構(液滴塗佈法): 藉由鍛燒二氧化鈦光電極混摻聚苯乙烯微米球後所產生之空間,利用液滴塗佈法將奈米金粒子吸附在二氧化鈦薄膜的表面。 (2) 嵌入金的二氧化鈦結構(磁石攪扮法): 藉由磁石攪拌法,將奈米金粒子有效地混摻於二氧化鈦塗料中。相較於第一種方法,此法使得奈米金粒子更均勻分布於光電極併且更妥善地包覆在二氧化鈦環境中。 (3) 四氯化鈦後處理於嵌入金的二氧化鈦結構: 將奈米金粒子有效地摻雜於二氧化鈦塗料中,並且以四氯化鈦法做後處理,使得奈米金粒子表面包覆額外的二氧化鈦層(約1奈米)。 在以上三種結構中,奈米金粒子的加入皆不會影響開路電壓及填充因子,而短路電流則會和電池效率呈高度正相關。短路電流及電池效率會與摻雜奈米金粒子的濃度呈現先上升、後下降的趨勢。實驗結果顯示最佳摻雜金奈米粒子濃度為0.5 wt.%,其效率可提升19.0 %。 This research studies the effect of additive Au nanoparticles incorporated in the TiO2 photoanodes of dye-sensitized solar cells (DSSCs). Localized surface plasmon resonance (LSPR), which exists at the interfaces between the Au nanoparticles and the TiO2 nanoparticles, could enhance the electromagnetic field in the proximity of Au nanoparticles (~10 nm), and furthermore, increase the light absorption of TiO2 photoanodes. In addition, the Electrochemical Impedance Spectroscopy (EIS) measurement results show that Au nanoparticles could reduce the electron transfer resistance at the interfaces of TiO2/dye/electrolyte, and therefore facilitate the charge transport in the DSSCs. In this research, we study three different structures with additive Au nanoparticles: (1) Au-adsorbed TiO2 films via drop-casting method: The Au nanoparticles were drop-casted and then adsorbed at the surface of TiO2 film. The Au nanoparticles penetrated the TiO2 film via the microcavaties, which were created by calcinating the polystyrene spheres embedded TiO2 film. (2) Au-embedded TiO2 films via stirring method: The Au nanoparticles were mixed properly with TiO2 nanoparticles via stirring method. The Au nanoparticles dispersed at the TiO2 matrix more randomly and were covered by the TiO2 nanoparticles more properly than the drop-casting method. (3) Au-embedded TiO2 films with TiCl4 post-treatment: Au-embedded TiO2 films were applied with TiCl4 treatment, which enabled the growth of additional TiO2 layer (~ 1 nm) at the surface of Au nanoparticles. In all structures studied, the existence of Au nanoparticles do not influence the open circuit voltage (V¬oc) and fill factor (F.F.). The cell efficiency is positively correlated with the short circuit current density (Jsc), which increases first and then decreases as the concentration of Au nanoparticles increases. An optimal efficiency enhancement of 19.0 % is obtained when the concentration of Au nanoparticles is 0.5 wt.%. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62948 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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