纳米多孔碳酸钙包覆二氧化钛电极的制备及其在染料敏化太阳能电池中的应用。

Preparation of a nanoporous CaCO3-coated TiO2 electrode and its application to a dye-sensitized solar cell.

作者信息

Lee Sangwook, Kim Jin Young, Youn Sung Hun, Park Min, Hong Kug Sun, Jung Hyun Suk, Lee Jung-Kun, Shin Hyunho

机构信息

School of Materials Science and Engineering, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul 151-744, South Korea.

出版信息

Langmuir. 2007 Nov 6;23(23):11907-10. doi: 10.1021/la701826v. Epub 2007 Oct 10.

DOI:10.1021/la701826v

PMID:17927224

Abstract

A nanoporous CaCO3 overlayer-coated TiO2 thick film was prepared by the topotactic thermal decomposition of Ca(OH)2, and its performance as an electrode of a dye-sensitized solar cell was investigated. As compared to bare TiO2, nanoporous CaCO3-coated TiO2 provided higher specific surface area and, subsequently, a larger amount of dye adsorption; this in turn increased short-circuit current (Jsc). Furthermore, the CaCO3 coating demonstrated increased impedance at the TiO2/dye/electrolyte interface and increased the lifetime of the photoelectrons, indicating the improved retardation of the back electron transfer, which increases Jsc, open-circuit voltage (Voc), and fill factor (ff). Thereby, the energy conversion efficiency (eta) of the solar cell improved from 7.8 to 9.7% (an improvement of 24.4%) as the nanoporous CaCO3 layer was coated onto TiO2 thick films.

摘要

通过Ca(OH)₂的拓扑热分解制备了纳米多孔CaCO₃覆盖层包覆的TiO₂厚膜，并研究了其作为染料敏化太阳能电池电极的性能。与裸TiO₂相比，纳米多孔CaCO₃包覆的TiO₂具有更高的比表面积，进而吸附了更多的染料；这反过来又增加了短路电流（Jsc）。此外，CaCO₃涂层在TiO₂/染料/电解质界面处表现出增加的阻抗，并延长了光电子的寿命，表明反向电子转移的延迟得到改善，这增加了Jsc、开路电压（Voc）和填充因子（ff）。因此，当在TiO₂厚膜上包覆纳米多孔CaCO₃层时，太阳能电池的能量转换效率（η）从7.8%提高到9.7%（提高了24.4%）。