title: D-π-A dye system containing cyano-benzoic acid as anchoring group for dye-sensitized solar cells.
abstract: A D-π-A dye (KM-1) incorporating cyano-benzoic acid as a new acceptor/anchoring group has been synthesized for dye-sensitized solar cells (DSCs) with a high molar extinction coefficient of 66,700 M(-1) cm(-1) at 437 nm. Theoretical calculations show that the hydrogen bond between -CN and surface hydroxyl leads to the most stable configuration on the surface of TiO(2). In addition, the adsorption of the dye on TiO(2) follows a Brunauer-Emmett-Teller (BET) isotherm. Multilayer adsorption of KM-1 on TiO(2) seems to take place particularly at higher dye concentrations. DSC device using KM-1 reached a maximum incident photon-to-current conversion efficiency (IPCE) of 84%, with a solar to electric power conversion efficiency (PCE) of 3.3% at AM1.5 G illumination (100 mW cm(-2)). This new type of anchoring group paves a way to design new dyes that combine good visible light harvesting with strong binding to the metal oxide surface.
authors: Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland.
authors: Masataka
authors: M
authors: Katono
authors: Takeru
authors: T
authors: Bessho
authors: Sheng
authors: S
authors: Meng
authors: Robin
authors: R
authors: Humphry-Baker
authors: Guido
authors: G
authors: Rothenberger
authors: Shaik M
authors: SM
authors: Zakeeruddin
authors: Efthimios
authors: E
authors: Kaxiras
authors: Michael
authors: M
authors: Grätzel
mesh_terms: D000327:Adsorption; D019817:Benzoic Acid / Q000737:chemistry*; D004396:Coloring Agents / Q000138:chemical synthesis / Q000737:chemistry*; D003486:Cyanides / Q000737:chemistry*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry; D011789:Quantum Theory; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D003486:Cyanides; C009495:titanium dioxide; D019817:Benzoic Acid; D014025:Titanium