Coumarin dye with ethynyl group as π-spacer unit for dye sensitized solar cells

• Autor(a) principal: Torres, Érica
• Data de Publicação: 2015
• Outros Autores: Sequeira, Sara, Parreira, Pedro, Mendes, Paulo J., Silva, Tiago J.L., Brites, Maria João
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10174/17095; https://doi.org/10.1016/j.jphotochem.2015.05.017
• topic: Coumarin dyes; Alkyne bridge; Dye-sensitized solar cells; EIS analysis; Charge recombination; Dye aggregation

C1-LEN coumarin dye, containing an ethynyl conjugated bridge was tested as a new chromophore for dye-sensitized solar cells (DSSCs). Investigation on the relationship of dye structure, optical properties, electrochemical properties and performance of DSSCs is described. The C1-LEN-sensitized solar cells showed an overall conversion efficiency of 2.2% (JSC = 6.11 mA/cm2, VOC = 547 mV, FF = 0.66), which corresponds to 68% of N719-based device efficiency, fabricated under similar conditions. Electrochemical impedance spectroscopy (EIS) analysis reveals that charge recombination at the nanocrystalline TiO2/dye/redox electrolyte interface is similar for C1-LEN and N719 sensitized solar cells, i.e., charge recombination is not the factor limiting the performance of C1-LEN device.