Photovoltaic Behavior of Dye-sensitized Long TiO2 Nanotube Arrays

Bulletin of the Korean chemical society

Yong Joo Kim¹  Gooil Lim¹  Young Sik Choi¹  Sang Mo Kim¹  Hark Jin Kim¹  Wan In Lee¹ 

关键词: Dye-sensitized solar cells (DSC);    TiO2 nanotube arrays;    Anodization;    Electron diffusion;    Photovoltaic conversion efficiency;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Long TiO2 nanotube (NT) arrays, prepared by electrochemical anodization of Ti foils, have been utilized as dye-adsorbing electrodes in dye-sensitized solar cells (DSCs). By anodizing for 1-24 hr and subsequent annealing, highly crystallized and tightly-adhered NT arrays were tailored to 11-150 μm lengths, ~90 nm innerpore diameter and ~30 nm wall thickness. I-V curves revealed that the photovoltaic conversion efficiency (η) was proportional to the NT length up to 36 μm. Beyond this length, the η was still steadily increased, though at a much lower rate. For example, an η of 5.05% at 36 μm was increased to 6.18% at 150 μm. Transient photoelectron spectroscopic analyses indicated that NT array-based DSCs revealed considerably higher electron diffusion coefficient (De) and life time (τe) than those with TiO2 nanoparticles (NP). Moreover, the electron diffusion lengths (Le) of the photo-injected electrons were considerably larger than the corresponding NT lengths in all the cases, suggesting that electron transport in NT arrays is highly efficient, regardless of tube length.

【 授权许可】

Unknown