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dc.contributor.authorTien, Ta-Changen_US
dc.contributor.authorPan, Fu-Mingen_US
dc.contributor.authorWang, Lih-Pingen_US
dc.contributor.authorLee, Chia-Huaen_US
dc.contributor.authorTung, Yung-Liangen_US
dc.contributor.authorTsai, Song-Yeuen_US
dc.contributor.authorLin, Chingen_US
dc.contributor.authorTsai, Feng-Yuen_US
dc.contributor.authorChen, Su-Jenen_US
dc.date.accessioned2014-12-08T15:09:05Z-
dc.date.available2014-12-08T15:09:05Z-
dc.date.issued2009-07-29en_US
dc.identifier.issn0957-4484en_US
dc.identifier.urihttp://dx.doi.org/10.1088/0957-4484/20/30/305201en_US
dc.identifier.urihttp://hdl.handle.net/11536/6930-
dc.description.abstractLow-temperature (similar to 150 degrees C), atomic-layer-deposited Al(2)O(3) films on nanoporous TiO(2) 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(2)O(3) with a thickness of similar to 0.2 nm. The formation of Ti-O-Al(OH)(2) and interfacial dipole layers exhibited a strong influence on the work function of the Al(2)O(3) over-layers, while the thicker Al(2)O(3) over-layers caused the values of valence band maximum and band gap to approach the values associated with pure Al(2)O(3). A work function difference (Delta Phi(A-T)) of 0.4 eV and a recombination barrier height (epsilon(RB)) of 0.1 eV were associated with the highest PCE achieved by the first monolayer of the Al(2)O(3) layer. Thicker Al(2)O(3) over-layers, however, caused significant reduction of PCE with negative Delta Phi(T-A) and increased interfacial energy barrier height (*epsilon(IB)) between the N719 dyes and TiO(2) electrodes. It was concluded that the PCE of the DSSCs may correlate with Delta Phi(A-T), epsilon(RB), and *epsilon(IB) resulting from various thicknesses of the Al(2)O(3) 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 TiO(2) solar cells.en_US
dc.language.isoen_USen_US
dc.titleInterfacial energy levels and related properties of atomic-layer-deposited Al(2)O(3) films on nanoporous TiO(2) electrodes of dye-sensitized solar cellsen_US
dc.typeArticleen_US
dc.identifier.doi10.1088/0957-4484/20/30/305201en_US
dc.identifier.journalNANOTECHNOLOGYen_US
dc.citation.volume20en_US
dc.citation.issue30en_US
dc.citation.spageen_US
dc.citation.epageen_US
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
Appears in Collections:Articles