標題: Realizing omnidirectional light harvesting by employing hierarchical architecture for dye sensitized solar cells
作者: Hsieh, Ming-Yang
Lai, Fang-I
Chen, Wei-Chun
Hsieh, Min-Chi
Hu, Hsiang-Yi
Yu, Peichen
Kuoe, Hao-Chung
Kuo, Shou-Yi
光電工程學系
Department of Photonics
公開日期: 2016
摘要: To improve the omnidirectional light-harvesting in dye-sensitized solar cells (DSSCs), here we present a dandelion-like structure composed of ZnO hemispherical shells and nanorods. Uniformly distributed hemispherical shells effectively suppress the reflection over the broadband region at incident angles up to 60 degrees, greatly improving the optical absorption of the DSSCs. In addition, modulating the length of the ZnO nanorods controls the omnidirectional characteristics of DSSCs. This phenomenon is attributed to the degree of periodicity of the ZnO dandelion-like structures. Cells with shorter rods exhibit a high degree of periodicity, thus the conversion efficiencies of the cells show specific angle-independent features. On the other hand, the cells with longer lengths reveal angle-dependent photovoltaic performance. Along with the simulation, the cells with dandelion-like ZnO structures can couple incident photons efficiently to achieve excellent broadband and omnidirectional light-harvesting performances experimentally, and the DSSCs enhanced the conversion efficiency by 48% at large incident angles. All these findings not only provide further insight into the light-trapping mechanism in these complex three-dimensional nanostructures but also offer efficient omnidirectional and broadband nanostructured photovoltaics for advanced applications.
URI: http://dx.doi.org/10.1039/c5nr07948a
http://hdl.handle.net/11536/133579
ISSN: 2040-3364
DOI: 10.1039/c5nr07948a
期刊: NANOSCALE
Volume: 8
Issue: 10
起始頁: 5478
結束頁: 5487
顯示於類別:期刊論文