title: Solution processable diketopyrrolopyrrole (DPP) cored small molecules with BODIPY end groups as novel donors for organic solar cells.
abstract: Two novel triads based on a diketopyrrolopyrrole (DPP) central core and two 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) units attached by thiophene rings have been synthesised having high molar extinction coefficients. These triads were characterised and used as donor materials in small molecule, solution processable organic solar cells. Both triads were blended with PC71BM as an acceptor in different ratios by wt % and their photovoltaic properties were studied. For both the triads a modest photovoltaic performance was observed, having an efficiency of 0.65%. Moreover, in order to understand the ground and excited state properties and vertical absorption profile of DPP and BODIPY units within the triads, theoretical DFT and TDDFT calculations were performed.
authors.affiliation: WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK.
authors.forename: Diego
authors.initials: D
authors.lastname: Cortizo-Lacalle
authors.affiliation: Organic Semiconductor Centre, SUPA, School of Physics & Astronomy, University of St. Andrews, St. Andrews, KY16 9SS, UK.
authors.forename: Calvyn T
authors.initials: CT
authors.lastname: Howells
authors.affiliation: Organic Semiconductor Centre, SUPA, School of Physics & Astronomy, University of St. Andrews, St. Andrews, KY16 9SS, UK ; Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore 560012, India.
authors.forename: Upendra K
authors.initials: UK
authors.lastname: Pandey
authors.affiliation: WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK.
authors.forename: Joseph
authors.initials: J
authors.lastname: Cameron
authors.affiliation: WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK.
authors.forename: Neil J
authors.initials: NJ
authors.lastname: Findlay
authors.affiliation: WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK.
authors.forename: Anto Regis
authors.initials: AR
authors.lastname: Inigo
authors.affiliation: WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK.
authors.forename: Tell
authors.initials: T
authors.lastname: Tuttle
authors.affiliation: WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Skabara
authors.affiliation: Organic Semiconductor Centre, SUPA, School of Physics & Astronomy, University of St. Andrews, St. Andrews, KY16 9SS, UK.
authors.forename: Ifor D W
authors.initials: ID
authors.lastname: Samuel
keywords: BODIPY; diketopyrrolopyrrole; organic semiconductors; organic solar cells; thiophene