Role of Adsorption Structures of Zn-Porphyrin on TiO2 in Dye-Sensitized Solar Cells Studied by Sum Frequency Generation Vibrational Spectroscopy and Ultrafast Spectroscopy
作者： Shen Ye , Arunkumar Kathiravan , Hironobu Hayashi , Yujin Tong , Yingyot Infahsaeng
DOI: 10.1021/JP400336R
关键词:
摘要: Several Zn-porphyrin (ZnP) derivatives were designed to build highly efficient dye-sensitized solar cells (DSC). It was found that cell efficiencies normalized for surface coverage (ηrel) are affected by the molecular spacer connecting porphyrin core TiO2 surface, sensitization conditions (solvent and time), and, a lesser extent, nature of terminal group ZnP. Ultrafast transient absorption spectroscopy shows electron transfer rates strongly dependent on conditions. To understand this behavior at level, surface-sensitive vibrational spectroscopy, sum frequency generation (SFG), has been employed investigate adsorption geometries these ZnP first time. The average tilt angles ordering molecules measured. A simple linear correlation between geometry adsorbed molecules, ηrel, concentration long-...
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