臺灣博碩士論文加值系統

本研究提出低成本、無毒害的光吸收材料─銅硫化物Cu2-xS (x = 1, 0.03)並且以簡易合成方式應用到量子點敏化太陽能電池(QDDSC)中。本實驗採用硫化銅量子點(Cu2-xS quantum dots，Cu2-xS QDs)作為光敏化劑以連續離子層沉積反應法(Successive Ionic Layer Adsorption and Reaction method-SILAR)合成量子點組裝到二氧化鈦(TiO2)電極上，做為敏化太陽能電池的光電極。並且使用二氧化鈦緊密層、塗佈二氧化鈦散射層(TiO2 scattering layer)、退火處理(anneal)與硫化鋅塗層(ZnS coating)以提升電池轉換效率。最佳的電池轉換效率為0.65%，開路電壓為0.14 V，短路電流為22.9 mA/cm2，填充因子為20.2%。以金電極取代鉑對電極可以得到更高的電池轉換效率為0.90%，開路電壓為0.17 V，短路電流28.1 mA/cm2，填充因子為18.9%。發現改用金當對電極可提高電池轉換效率約為38%。Cu2-xS的結晶性和形態以X-ray繞射(XRD)和穿透式電子顯微鏡(TEM)分析。其光學特性藉由紫外-可見光光譜儀(UV-Vis spectroscopy)分析。

We study copper sulfide (Cu2-xS), a low-cost and non-toxic light absorbing material and apply to the quantum dot-sensitized solar cells (QDDSC). The copper sulfide quantum dots (QDs) were synthesized on a nanoporous TiO2 electrode by the successive ionic layer adsorption and reaction method (SILAR). To improve efficiency, passivation treatments including a TiO2 under layer ,a ZnS coating and additional treatments including annealing, a TiO2 scattering layer and an Au counterelectrode were used. The best cell yields a short-circuit current of 22.9 mA/cm2, an open circuit voltage of 0.14 V, a fill factor of 20.2% and a power conversion efficiency of 0.65%. By replacing the platinum count erelectrode with a gold electrode, the performance improves to conversion efficiency 0.90%, open circuit voltage 0.17V, short-circuit current 28.1mA/cm2 and fill factor 18.9%. The efficiency of gold-electrode cells are ~ 38% higher than that of the Pt electrode cells. The crystallinity and morphology were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The optical properties of these Cu2-xS QDs were characterized by UV-vis spectroscopy.

第一章 緒論………………………………………………………………1
1-1前言……………………………………………………………………1
1-2研究動機………………………………………………………………4
第二章 實驗原理與文獻回顧……………………………………………6
2-1DSSC工作原理………………………………………………………6
2-2DSSC/QDDSC組成結構……………………………………….......9
2-2-1透明導電玻璃………………………………………………………9
2-2-2光電極(二氧化鈦電極-TiiP、TiO2、SCL)……………………...10
2-2-3光敏化劑(染料分子/量子點)………………………………........11
2-2-4電解液…………………………………………………………...13
2-2-5金屬對電極……………………………………………………...14
2-2-6DSSC量測光源………………………………………………....15
2-2-7DSSC電壓-電流量測特性…………………………………… 17
2-3量子點的特性……………………………………………………20
2-3-1量子侷限效應…………………………………………………20
2-3-2衝擊離子化效應與歐傑再結合效應…………………………21
2-4量子點合成………………………………………………………22
2-5 QDDSC發展現況………………………………………………23
第三章 實驗製程……………………………………………………26
3-1實驗儀器…………………………………………………………26
3-2實驗藥品…………………………………………………………27
3-3DSSC I-V曲線量測系統………………………………………...28
3-4EQE光譜量測……………………………………………………30
3-5製作QDDSC步驟流程…………………………………………..32
3-5-1FTO基板處理與清洗………………………………………… 33
3-5-2TiiP溶液製作…………………………………………………33
3-5-3TiO2 paste……………………………………………………34
3-5-4合成Cu2-xS QD光電極………………………………………35
3-5-5配製電解液……………………………………………………36
3-5-6製作對電極……………………………………………………37
3-5-7電池封裝………………………………………………………38
第四章 結果討論……………………………………………………40
4-1Cu2-xS形態與光學分析……………………………………….40
4-1-1TEM形態分析…………………………………………………40
4-1-2XRD分析………………………………………………………40
4-1-3UV-Vis光學特性分析………………………………………...43
4-2 Cu2-xS量子點敏化太陽能電池的效能分析………………....45
4-3 Cu2-xS量子點敏化太陽能電池的量子效率分析……………64
第五章 結論………………………………………………………...65
參考文獻 ……………………………………………………………66

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