Donor−Acceptor‐Functionalized Subphthalocyanines for Dye‐Sensitized Solar Cells. Issue 11 (1st August 2018)

• Record Type: Journal Article
• Authors: Gotfredsen, Henrik; Neumann, Timo; Storm, Freja Eilsø; Muñoz, Alberto Viñas; Jevric, Martyn; Hammerich, Ole; Mikkelsen, Kurt V.; Freitag, Marina; Boschloo, Gerrit; Nielsen, Mogens Brøndsted
• Is Part Of: ChemPhotoChem. Volume 2:Issue 11(2018)
• Page Start: 976
• Page End: 985
• Publication Date: 2018-08-01
• Subjects: chromophores -- cross-coupling -- donor-acceptor systems -- macrocycles -- solar cells; Photochemistry -- Periodicals; Periodicals; Electronic journals; 541.35
• DOI: 10.1002/cptc.201800135
• Languages: English
• ISSNs: 2367-0932

Abstract

Abstract: Boron subphthalocyanines (SubPcs) are attractive as light harvesting materials in photovoltaic devices. Here we present the synthesis, optical and electrochemical properties, and device performances of a series of donor−acceptor‐functionalized SubPc derivatives incorporating a carboxylic acid for anchoring onto TiO2 . Liquid‐ and solid‐state dye‐sensitized solar cells (DSCs) were prepared from three compounds, and a triad system consisting of two aniline donor moieties and a benzothiadiazole acceptor moiety was found to exhibit the highest power conversion efficiency (PCE) in the series (PCE=1.54 %; solid‐state device). The compounds were prepared by stepwise acetylenic coupling reactions. In addition, we present the synthesis and optical properties of a SubPc derivative incorporating three anilino‐substituted 1, 1, 4, 4‐tetracyanobutadiene units, prepared by the [2+2] cycloaddition between three ethynyl units at the SubPc periphery and three tetracyanoethylene molecules followed by electrocyclic ring‐opening reactions. Abstract : Top of the class : The highest power conversion efficiency (PCE) reported to date for a dye‐sensitized solar cell (DSC) based on a boron subphthalocyanine dye has been achieved by incorporating donor and acceptor moieties on the dye (although the PCE is significantly lower than for related porphyrin and subporphyrin derivatives). The dye series was prepared by stepwise acetylenic coupling reactions and immobilized in both liquid‐ and solid‐state DSC devices.