https://scholars.lib.ntu.edu.tw/handle/123456789/491238
標題: | Interfacial energy levels and related properties of atomic-layer-deposited Al<inf>2</inf>O<inf>3</inf> films on nanoporous TiO<inf>2</inf> electrodes of dye-sensitized solar cells | 作者: | Tien, T.-C. Pan, F.-M. Wang, L.-P. Lee, C.-H. Tung, Y.-L. Tsai, S.-Y. Lin, C. Tsai, F.-Y. Chen, S.-J. FENG-YU TSAI |
公開日期: | 2009 | 卷: | 20 | 期: | 30 | 來源出版物: | Nanotechnology | 摘要: | Low-temperature (∼150 °C), atomic-layer-deposited Al 2O3 films on nanoporous TiO2 electrodes of dye-sensitized solar cells (DSSCs) were investigated using electron spectroscopy. The power conversion efficiency (PCE) of the DSSCs was increased from 5.7% to 6.5%, an improvement of 14%, with one monolayer of Al 2O3 with a thickness of ∼0.2nm. The formation of Ti-O-Al(OH)2 and interfacial dipole layers exhibited a strong influence on the work function of the Al2O3 over-layers, while the thicker Al2O3 over-layers caused the values of valence band maximum and band gap to approach the values associated with pure Al2O3. A work function difference (ΔΦ A-T) of 0.4eV and a recombination barrier height (ε RB) of 0.1eV were associated with the highest PCE achieved by the first monolayer of the Al2O3 layer. Thicker Al 2O3 over-layers, however, caused significant reduction of PCE with negative ΔΦT-A and increased interfacial energy barrier height (*εIB) between the N719 dyes and TiO2 electrodes. It was concluded that the PCE of the DSSCs may correlate with ΔΦA-T, εRB, and *εIB resulting from various thicknesses of the Al2O3 over-layers and that interfacial reactions, such as the formation of Ti-O-Al(OH)2 and dipole layers, play an important role in determining the interfacial energy levels required to achieve optimal performance of dye-sensitized TiO2 solar cells. © 2009 IOP Publishing Ltd. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/491238 | DOI: | 10.1088/0957-4484/20/30/305201 | SDG/關鍵字: | Atomic layer deposited; Band gaps; Barrier heights; Dye sensitized; Dye-Sensitized solar cell; Dye-sensitized solar cells; Interfacial dipole layers; Interfacial reactions; Low temperatures; N719 dye; Nanoporous TiO; Optimal performance; Power conversion efficiencies; Pure Al; TiO; Valence-band maximums; Work-function difference; Atoms; Conversion efficiency; Electrodes; Electron spectroscopy; Interfacial energy; Monolayers; Phase interfaces; Photoelectrochemical cells; Photovoltaic cells; Solar cells; Solar energy; Work function; Aluminum; aluminum oxide; dye; titanium dioxide; article; dipole; electrode; energy; nanopore; priority journal; spectroscopy; thickness |
顯示於: | 材料科學與工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。