| 中文摘要 |
銀 奈 米 材料具有良好的化學和物理穩定性， 銀奈米粒子 （silvernanoparticles, Ag NPs） 能夠引起局部表面電漿共振效應 （localized surfaceplasmon resonance, LSPR） 來提升太陽能電池的光電流。我們將粒徑約為50 至80 nm 的圓盤形銀奈米粒子 （silver nanodisk） 添加於ITO （indium tin oxide） 層上來提高高分子太陽能電池的性能。本研究之電池結構為ITO/AgNPs/PEDOT：PSS/P3HT:PC61BM（1:1）/Ca/Al，改變銀奈米粒子在ITO 層自組吸附時間分別為20、40、60 和80 分鐘，因此可得到不同的銀奈米粒子密度分佈。我們利用紫外光-可見光吸收光譜儀 （UV-Vis）、掃描探針顯微鏡 （SPM）、場發射電子顯微鏡 （FE-SEM） 和太陽光模擬光源系統來測量吸收度、粗糙度、表面形態和光電性質。由結果知，四種不同銀奈米粒子覆蓋密度之高分子太陽能電池之短路電流密度 （short-circuit current density, Jsc）、填充因子 （fill factor, FF）與光電轉換效率 （power conversion efficiency, PCE） 皆比未添加之電池高，顯示添加四種不同數量或覆蓋密度銀奈米粒子於ITO 層皆能有效提高電池之光電性能。試樣中以反應60 分鐘之電池的提升效果最佳，此電池具有最高的Jsc與PCE，分別為8.97 mA/cm2 與3.57%，與未添加之電池比較分別提升了26%與60%，而FF 也從0.49 增加到0.63，提升了29%。此提升結果可能是由於圓盤形銀奈米粒子產生之局部表面電漿共振效應增加了光電流所致。 |
| 英文摘要 |
Silver nanoparticles (Ag NPs) exhibit stable chemical and physicalproperties. We report on the efficiency enhancement of polymer solarcells by incorporating a silver nanoparticles self-assembled layer, grown on the indium tin oxide (ITO) surface by the electrostatic interaction betweenthe silver particles and modified ITO. The structure of polymer solar cellswas ITO/Ag NPs/PEDOT:PSS/P3HT:PC61BM(1:1)/Ca/Al. The coveragedensity of the silver nanodisks on the ITO substrates was controlled byvarying the reaction time of 20, 40, 60 and 80 min. We employed UV-Vis,SPM, FE-SEM and solar simulator to measure the absorbance, roughness,surface morphology, and power conversion efficiency (PCE), respectively.From these results, we found that the short circuit density (Jsc), fill factor(FF) and PCE of the cells with Ag NPs are always higher than those cellswithout Ag NPs. The polymer solar cells with Ag NPs by 60 minelectrostatic interaction exhibited the highest Jsc of 8.97 mA/cm2 and PCEof 3.57%. The increases of Jsc and PCE were 26% and 60% whencompared to cells without Ag NPs, respectively. The PCE increased mainlyfrom the improved photocurrent density as a result of excited localizedsurface plasmon resonance (LSPR) induced by silver nanoparticles. |
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