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標題: | 並聯式具高光學對比之光致電變色元件 An Integrated Photoelectrochromic Device with High Optical Contrast |
作者: | Chia-Yun Liao 廖嘉筠 |
指導教授: | 何國川 |
關鍵字: | 能量消耗,高光學對比,光致電變色元件,導電高分子PProDOT-Et2,普魯士藍,電致色變元件, energy consumption,high optical contrast,photoelectrochromic device,poly-(3,3-diethyl-3,4-dihydro-2H-thieno-[3,4-b][1,4]dioxepine),Prussian blue,electrochromic device, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 利用導電玻璃(TCO),將染料敏化太陽能電池(DSSC)結合串聯之電致色變元件(ECD)已於文獻中被提出,本論文以並聯的方式將DSSC與ECD結合成分開式之光致電變色元件(PECD),探討元件光學與電學之最適化。DSSC的部分,以二氧化鈦製備光電極,濺鍍白金於導電玻璃上為對電極,並使用N719為染料。電解液則以MPN溶劑添加LiI、I2、DMPII以及TBP。在此系統下,其所能達到之光電轉換效率、fill factor、開環電壓以及短路電流密度分別為5.99%、0.69、0.67 V和12.82 mA/cm2。
ECD的部分在第四章中使用導電高分子poly(3,3-diethyl-3,4-dihydro-2H-thieno-[3,4-b][1,4]dioxepine) (簡稱PProDOT-Et2)為ECD側之變色材料,以電鍍的方式將PProDOT-Et2成膜於已濺鍍白金的導電玻璃上,電解液為TBABr和LiClO4添加於MPN中。藉著調控電解液中Br2之含量,可觀察到DSSC側與ECD側能量供需平衡的現象。藉著切換DSSC-ECD於開環閉環兩狀態之間,最敏感的光學吸收度發生於波長585 nm的位置,並擁有最大穿透度變化33%,去著色時間分別為1.9及2.2秒。 第五章則將ECD端置換成無機材料普魯士藍,以旋轉塗佈的方式製備薄膜,電解液分為三系統討論之,分別為LiBr溶於PC、LiI於PC、以及MPN溶劑添加TBABr和LiClO4,由穿透度變化以及電化學的反應可觀察到離子效應。最大的穿透度變化發生在波長695 nm下,其值為53%。 Tandem dye-sensitized solar cell (DSSC)-electrochromic device (ECD) has been proposed using two-faced transparent conducting oxide (TCO). In this thesis, a stable, separated photoelectrochromic device (PECD) is assembled to form an integrated device consisting of both DSSC and ECD. The optimization of PECD toward its electro-optical performance is discussed. For the DSSC part, the photoelectrode is prepared by the commercial TiO2 powder (P25), platinum is sputtered on the ITO-glass as a counter electrode, and the commercial N719 dye is used. The electrolyte in the DSSC part is composed of LiI, I2, DMPII (1,2-dimethyl-3-propylimidazolium iodide) and TBP (4-tert-butylpyridine) in MPN (3-methoxypropionitrile). The best conversion efficiency, fill factor, open-circuit voltage, and photocurrent density are 5.99%, 0.69, 0.67 V, and 12.82 mA/cm2, respectively. For the ECD part, conducting polymer PProDOT-Et2 (poly(3,3-diethyl-3,4-dihydro-2H-thieno-[3,4-b][1,4]dioxepine)) thin film was discussed in chapter 4, which is electrodeposited onto a sputtered Pt electrode and chosen for the electrochromic purpose. The electrolyte in the ECD part is composed of Br2, TBABr (tetrabutylammonium bromide), and LiClO4 (lithium perchlorate) in MPN. The supply and demand of power density in DSSC-ECD system can be observed by changing the bromine concentration in the electrolyte of the ECD part. By switching the DSSC-ECD into the open-circuit or short-circuit condition, a maximum transmittance change (ΔT) between the bleached and the darkened state of 33% at 585 nm is observed. Furthermore, fast switching times of 1.9 and 2.2 s are noticed for bleaching and darkening, respectively. As for chapter 5, Prussian blue thin film is spin coated as electrochromic material. The electrolyte in the ECD part is consisting of three kinds of solution: LiBr (lithium bromide) in PC (propylene carbonate), LiI (lithium iodide) in PC, and TBABr with LiClO4 in MPN. The anion effect showed in transmittance difference and electrochemical analysis. The maximum transmittance change (ΔT) of 53% at 695 nm is observed. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65117 |
全文授權: | 有償授權 |
顯示於系所單位: | 高分子科學與工程學研究所 |
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