Photoinduced excitation and charge transfer processes of organic dyes with siloxane anchoring groups: a combined spectroscopic and computational study

作者: Elena Castellucci , Marco Monini , Matteo Bessi , Alessandro Iagatti , Laura Bussotti

DOI: 10.1039/C7CP01956D

关键词: Relaxation (NMR)Molecular orbitalPhotochemistryElectron transferSemiconductorExcited stateChemistrySiloxaneNanosecondMolecule

摘要: Dye-sensitized solar cells (DSSCs) have attracted significant interest in the last few years as effective low-cost devices for energy conversion. We analyzed excited state dynamics of several organic dyes bearing both cyanoacrylic acid and siloxane anchoring groups. The spectroscopic properties been studied solution when adsorbed on a TiO2 film using stationary time-resolved techniques, probing sub-picosecond to nanosecond time interval. comparison between spectra registered solid substrate evidences different pathways electron relaxation. transient TiO2-adsorbed show appearance long wavelength absorption band, attributed cationic dye species, which is absent measured solution. Furthermore, kinetic traces samples decay component not present constitutes indirect evidence transfer semiconductor. interpretation experimental results has supported by theoretical DFT calculations energies analysis molecular orbitals molecules.

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