Chang Wei-Chang, Wan-Chin Yu, Lin Lu-Yin, Yu Ying-Jung, Peng Yen-Ming
J Nanosci Nanotechnol. 2017 Apr;17(4):2431-437. doi: 10.1166/jnn.2017.12775.
The size effect of Au nanoparticles on plasmonic ZnO dye-sensitized cells (DSSCs) was investigated. Different sized Au nanoparticles (~5 nm, 10 nm, and 20 nm) were directly deposited on ZnO nanostructures via an in situ reduction technique. The size and the loading of Au nanoparticle were controlled by varying the amount of reducing agent and the reaction time, respectively. By introducing a proper amount of Au nanoparticles into the photoanode, plasmon-enhanced light absorption, photocurrent and power conversion efficiency were demonstrated, with the enhancement increased with decreasing Au particle size. Overloading the photoanode with Au nanoparticles, however, led to a decline in photocurrent and thus the cell efficiency. Au/ZnO DSSCs with optimized film thickness and 5 nm-Au loading attained an efficiency of 3.49%, corresponding to a 59% improvement over that of pure ZnO DSSCs. The improvement in cell efficiency was ascribed to a significant increase in the photocurrent of Au/ZnO devices, as a result of enhanced light harvesting and reduced interfacial resistance in the photoanode.
研究了金纳米颗粒对等离子体氧化锌染料敏化电池（DSSCs）的尺寸效应。通过原位还原技术将不同尺寸（约5纳米、10纳米和20纳米）的金纳米颗粒直接沉积在氧化锌纳米结构上。金纳米颗粒的尺寸和负载量分别通过改变还原剂的量和反应时间来控制。通过向光阳极中引入适量的金纳米颗粒，证明了等离子体增强光吸收、光电流和功率转换效率，且随着金颗粒尺寸的减小增强作用增大。然而，用金纳米颗粒使光阳极过载会导致光电流下降，从而使电池效率降低。具有优化膜厚和5纳米金负载量的金/氧化锌DSSCs效率达到3.49%，比纯氧化锌DSSCs提高了59%。电池效率的提高归因于金/氧化锌器件光电流的显著增加，这是由于光阳极中光捕获增强和界面电阻降低的结果。
