title: Bi-anchoring organic sensitizers of type D-(π-A)₂ comprising thiophene-2-acetonitrile as π-spacer and malonic acid as electron acceptor for dye sensitized solar cell applications.
abstract: Two new bi-anchoring organic sensitizers of type D-(π-A)2 comprising the identical π-spacer (thiophene-2-acetonitrile) and electron acceptor (malonic acid) but different aryl amine as electron donors (diphenylamine and carbazole) were synthesized, characterized and fabricated metal free dye-sensitized solar cell devices. The intra molecular charge transfer property and electrochemical property of these dyes were investigated by molecular absorption, emission, cyclic voltammetric experiments and in addition, quantum chemical calculation studies were performed to provide sufficient driving force for the electron injection into the conduction band of TiO2 which leads to efficient charge collection. Among the fabricated devices, carbazole based device exhibits high current conversion efficiency (η=4.7%) with a short circuit current density (JSC) 15.3 mA/cm(2), an open circuit photo voltage (VOC) of 0.59 V and a fill factor of 0.44 under AM 1.5 illumination (85 mW/cm(2)) compared to diphenylamine based device.
authors: Nanomaterials and Solar Energy Conversion Laboratory, Department of Chemistry, National Institute of Technology, Trichy 620 015, India.
authors: Gachumale Saritha
authors: GS
authors: Reddy
authors: Nanomaterials and Solar Energy Conversion Laboratory, Department of Chemistry, National Institute of Technology, Trichy 620 015, India.
authors: Sekar
authors: S
authors: Ramkumar
authors: The Center of Excellence for Advanced Materials Research, King Abdulaziz University, P.O. Box 80203, Jeddah 21413, Saudi Arabia.
authors: Abdullah M
authors: AM
authors: Asiri
authors: Nanomaterials and Solar Energy Conversion Laboratory, Department of Chemistry, National Institute of Technology, Trichy 620 015, India. Electronic address: sanand99@yahoo.com.
authors: Sambandam
authors: S
authors: Anandan
mesh_terms: D000097:Acetonitriles / Q000138:chemical synthesis* / Q000737:chemistry*; D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry*; D004560:Electricity; D055664:Electrochemical Techniques; D004583:Electrons; D008314:Malonates / Q000737:chemistry*; D012993:Solar Energy; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D013876:Thiophenes / Q000138:chemical synthesis* / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry
chemical_list: D000097:Acetonitriles; D004396:Coloring Agents; D008314:Malonates; D013876:Thiophenes; C009495:titanium dioxide; C030290:malonic acid; D014025:Titanium; C032159:acetonitrile
keywords: Binding strength; DSSCs; Electron lifetime; Malonic acid; Planar nature