Dye-Sensitizing of Self-Nanostructured Ti(:Zn)O2/AZO Transparent Electrodes by Self-Assembly of 5,10,15,20-Tetrakis(4-carboxyphenyl)porphyrin

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• 作者：Giovanna Pellegrino ; Guglielmo G. Condorelli ; Vittorio Privitera ; Brunella Cafra ; Silvia Di Marco ; Alessandra Alberti
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：April 21, 2011
• 年：2011
• 卷：115
• 期：15
• 页码：7760-7767
• 全文大小：1035K
• 年卷期：v.115,no.15(April 21, 2011)
• ISSN：1932-7455

文摘

Self-nanostructured ZnO:Al conductive layers consisting of [112虆0] oriented domains were coated by a conformal TiO<sub>2sub> thin film and sensitized by 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (TCPP) to be used as transparent conductive electrodes in dye-sensitized solar cells. In addition to the higher surface availability due to the nanopatterning, the TCPP surface density increases by 330% (UV鈭抳is) with respect to a flat conventional substrate thanks to a more dense molecular arrangement, as evidenced by combining high-resolution X-ray photoelectron spectroscopy and atomic force microscopy. Furthermore, the presence of zinc atoms in the TiO<sub>2sub> overlayer (Ti(:Zn)O<sub>2sub>) crucially influences the electronic properties of the assembled TCPP. As a consequence of the orbitals' rearrangement attributed to the presence of zinc, a significant quenching of luminescence is observed in the emission spectra of TCPP-sensitized Ti(:Zn)O<sub>2sub>, suggesting that electrons could be more effectively injected from the molecular orbitals to the conduction band of the semiconductor.