Lee Seung Hee, Jin Ho, Kim Dong-Yeong, Song Kyung, Oh Sang Ho, Kim Sungjee, Schubert E Fred, Kim Jong Kyu
Opt Express. 2014 May 5;22 Suppl 3:A867-79. doi: 10.1364/OE.22.00A867.
Photo-electrodes with tailored three-dimensional nanostructures offer a large enhancement in light harvesting capability for various optoelectronic devices enabled by strong light scattering in the nanostructures as well as improved charge transport. Here we present an array of three-dimensional titanium dioxide (TiO₂) nanohelixes fabricated by the oblique angle deposition method as a multifunctional photoanode for CdSe quantum dot sensitized solar cells (QDSSCs). The CdSe QDSSC with a TiO₂ nanohelix photoanode shows a 100% higher power conversion efficiency despite less light being absorbed in CdSe QDs when compared with a conventional TiO₂ nanoparticle photoanode. We attribute the higher power conversion efficiency to strong light scattering by the TiO₂ nanohelixes and much enhanced transport and collection of photo-generated carriers enabled by the unique geometry and near-single crystallinity of the TiO₂ nanohelix structure.
具有定制三维纳米结构的光电极，通过纳米结构中的强光散射以及改善的电荷传输，为各种光电器件提供了大幅增强的光捕获能力。在此，我们展示了一种通过倾斜角沉积法制备的三维二氧化钛（TiO₂）纳米螺旋阵列，作为用于CdSe量子点敏化太阳能电池（QDSSC）的多功能光阳极。与传统的TiO₂纳米颗粒光阳极相比，具有TiO₂纳米螺旋光阳极的CdSe QDSSC尽管在CdSe量子点中吸收的光较少，但功率转换效率却高出100%。我们将更高的功率转换效率归因于TiO₂纳米螺旋的强光散射，以及TiO₂纳米螺旋结构独特的几何形状和近单晶性所实现的光生载流子传输和收集的大幅增强。
