Novel Ru-based sunlight harvesters bearing dithienylpyrrolo (DTP)-bipyridine ligands: Synthesis, characterization and photovoltaic properties

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• 作者：Sajida Noureen ; Roberto Argazzi ; Antonio Monari ; Marc Beley ; Xavier Assfeld ; Carlo A. Bignozzi ; Stefano Caramori ; Philippe C. Gros
• 关键词：Photosensitizers ; DSSC ; Excited state ; Electron transfer ; Transient spectroscopy ; Light harvesting
• 刊名：Dyes and Pigments
• 出版年：February, 2014
• 年：2014
• 卷：101
• 期：Complete
• 页码：318-328
• 全文大小：1514 K

文摘

Bipyridine bearing 蟺-delocalized dithienypyrrole moieties (DTP) have been involved as ligands (L) in the preparation of RuL₂(dcbpy)²⁺ and RuL(dcbpy)(NCS)₂ dyes. These dyes exhibited wide absorption domains in solution and when adsorbed on TiO₂ photoanodes, light harvesting was found to be excellent (absorbance>1 in the 350-600聽nm range). Careful investigations, combining transient spectroscopy and ab initio computations evidenced the capture of the photoexcited electron by low lying orbitals centred on the DTP moiety thus limiting the efficiency in DSSC despite favourable redox potentials for both injection and ground state regeneration.