Department of Energy Science, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, Republic of Korea.
ACS Nano. 2011 Jun 28;5(6):5088-93. doi: 10.1021/nn201169u. Epub 2011 May 20.
We report on the influence of hierarchical structures, constructed via layer-by-layer assembly of self-standing titania nanotube arrays and nanoparticles, upon charge recombination and photoelectric performance of front-illuminated dye-sensitized solar cells. Both nanotubes and nanoparticles were produced by anodization rather than additionally employing other methods, providing low cost and great simplicity. Electrochemical impedance spectroscopy under AM 1.5 illumination indicates the construction of hybrid morphology has superior recombination characteristics and a longer electron lifetime than nanoparticulate systems. This enhancement with the incorporation of anodized titania nanoparticles with 1D architectures is unprecedented for solar cells. Owing to the better light harvesting efficiency, extended electron lifetime and desirable electron extraction, the short-circuit photocurrent density of solar cell is 18.89 mA cm(-2) with an overall power conversion efficiency of 8.80% and an incident photon-to-current conversion efficiency of 84.6% providing a very promising candidate for sustainable energy production with a high performance/cost ratio.
我们研究了通过层层组装自支撑的二氧化钛纳米管阵列和纳米粒子构建的分层结构对前照式染料敏化太阳能电池的电荷复合和光电性能的影响。纳米管和纳米粒子都是通过阳极氧化而不是采用其他方法制备的，这提供了低成本和高简易性。在 AM1.5 光照下的电化学阻抗谱表明，与纳米颗粒体系相比，混合形态结构具有更好的复合特性和更长的电子寿命。这种通过将具有一维结构的阳极氧化二氧化钛纳米粒子掺入到太阳能电池中的增强效果是前所未有的。由于更好的光捕获效率、延长的电子寿命和理想的电子提取，太阳能电池的短路光电流密度为 18.89 mA cm(-2)，整体功率转换效率为 8.80%，入射光子到电流转换效率为 84.6%，为具有高性能/成本比的可持续能源生产提供了一个很有前途的候选方案。
