title: Synthesis and characterization of donor-π-acceptor-based porphyrin sensitizers: potential application of dye-sensitized solar cells.
abstract: New porphyrin sensitizers based on donor-π-acceptor (D-π-A) approach have been designed, synthesized, characterized by various spectroscopic techniques and their photovoltaic properties explored. N,N'-Diphenylamine acts as donor, the porphyrin is the π-spacer, and either carboxylic acid or cyanoacryclic acid acts as acceptor. All compounds were characterized by using (1)H NMR spectroscopy, ESI-MS, UV-visible emission spectroscopies as well as electrochemical methods. The presence of aromatic groups between porphyrin π-plane and acceptor group push the absorption of both Soret and Q-bands of porphyrin towards the red region. The electrochemical properties suggests that LUMO of these sensitizers above the TiO2 conduction band. Finally, the device was fabricated using liquid redox electrolyte (I(-)/I3(-)) and its efficiency was compared with that of a leading sensitizer.
authors.affiliation: Aisin Cosmos R&D Co. Ltd., HUDA Complex, Tarnaka, Hyderabad, 500007 (India).
authors.forename: Mareedu
authors.initials: M
authors.lastname: Sreenivasu
authors.forename: Akira
authors.initials: A
authors.lastname: Suzuki
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Adachi
authors.forename: Challuri Vijay
authors.initials: CV
authors.lastname: Kumar
authors.forename: Bingi
authors.initials: B
authors.lastname: Srikanth
authors.forename: S
authors.initials: S
authors.lastname: Rajendar
authors.forename: Dasa
authors.initials: D
authors.lastname: Rambabu
authors.forename: Rangaraju Satish
authors.initials: RS
authors.lastname: Kumar
authors.forename: P
authors.initials: P
authors.lastname: Mallesham
authors.forename: N Vijaya Bhaskar
authors.initials: NV
authors.lastname: Rao
authors.forename: M Suresh
authors.initials: MS
authors.lastname: Kumar
authors.forename: P Y
authors.initials: PY
authors.lastname: Reddy
keywords: donor-acceptor systems; electrochemistry; porphyrins; sensitizers; zinc