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標題: 離子交換法製備Pb-Sb-Se 奈米顆粒: 一種新型太陽能吸收材料及在量子點敏化太陽能電池的應用
Ion exchange-prepared Pb-Sb-Se nanoparticles: A new solar absorber material for quantum dot-sensitized solar cells
作者: 蔣青儒
Cing-Ru Jiang
關鍵字: 離子交換法;量子點敏化太陽能電池;Pb-Sb-Se;quantum dot-sensitized solar cells
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本論文主要是以合成新型三元素化合物Pb-Sb-Se做為太陽能電池中的吸光材料。Pb-Sb-Se奈米顆粒(nanoparticles - NPs)是由Pb-Sb-S前驅物透過離子交換法製備而得。Pb-Sb-S前驅物是使用連續離子層吸附反應法( Successive ionic layer absorption and reaction - SILAR) 並經過退火將三元化合物量子點合成於多孔性TiO2薄膜內。在XRD (X-ray diffraction) pattern中可以清楚得知,經由Pb-Sb-S前驅物變為Pb-Sb-Se時,XRD的峰明顯向左偏移0.8-1.3度。能量色散X射線光譜(Energy-dispersive X-ray spectroscopy - EDS) 成功證實經由離子交換(S2-Se2-) 完全,得到Pb-Sb-Se相。其光學特性則使用紫外-可見光譜儀(UV-Vis Spectroscopy)做分析與計算平均能隙約為1.45 eV,其低於Pb-Sb-S前驅物(約1.75 eV)。
Pb-Sb-Se NPs 首次被合成且應用在液態量子點敏化太陽能電池上。目前,最佳樣品,在100 % AM 1.5太陽光下,得到電池轉換效率為1.15 %,開路電壓為0.28 V、短路電流為12.01 mA/cm2、填充因子FF為34.22 %;於10 % AM 1.5太陽光下可以得到的電池功率轉換效率為4.18 %、開路電壓為0.26 V、短路電流為3.07 mA/cm2、填充因子為52.25 %。

This thesis describes the new ternary semiconductor sensitizer lead antimony selenide (Pb-Sb-Se) for solar cells. Pb-Sb-Se nanoparticles (NPs) have been prepared from a lead antimony sulfide (Pb-Sb-S) precursor by the solution-based Se2- anion exchange reaction. The Pb-Sb-S precursor was grown on a mesoporous TiO2 electrode using the successive ionic layer adsorption and reaction (SILAR) process. To analyze the property the as-prepared materials were characterized by UV-Visible, X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). XRD shows that the synthesized Pb-Sb-Se NPs have the same crystal structure as the Pb-Sb-S precursor with the diffraction angles significantly down-shifted around 0.8-1.3˚. Energy-dispersive X-ray spectroscopy (EDS) confirms the complete anion exchange from Pb-Sb-S and formation of the Pb-Sb-Se phase. UV-visible spectroscopy reveals the Pb-Sb-Se NPs optical energy gap (Eg) to be ~ 1.45 eV that is lower than the Pb-Sb-S precursor (~1.75 eV).
Liquid-junction semiconductor-sensitized solar cells were fabricated from the synthesized Pb-Sb-Se semiconductor with polysulfide electrolyte and Pt electrode as counter electrode. The best cell yields a short-circuit current (Jsc) of 8.3 mA/cm2, an open circuit voltage (Voc) of 0.3 V, a fill factor (FF) of 32.8 %, and a power conversion efficiency (PCE) of 1.15 % (one sun) and 4.18 % (10 % sun), respectively.
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