4H-1,2,6-Thiadiazin-4-one-containing small molecule donors and additive effects on their performance in solution-processed organic solar cells

Felix Hermerschmidt; Andreas S. Kalogirou; Jie Min; Georgia A. Zissimou; Sachetan M. Tuladhar; Tayebeh Ameri; Hendrik Faber; Grigorios Itskos; Stelios A. Choulis; Thomas D. Anthopoulos; Donal D. C. Bradley; Jenny Nelson; Christoph J. Brabec; Panayiotis A. Koutentis

doi:10.1039/C4TC02931C

4H-1,2,6-Thiadiazin-4-one-containing small molecule donors and additive effects on their performance in solution-processed organic solar cells†

Felix Hermerschmidt,*^a Andreas S. Kalogirou,^b Jie Min,^c Georgia A. Zissimou,^b Sachetan M. Tuladhar,^d Tayebeh Ameri,^c Hendrik Faber,^d Grigorios Itskos,^e Stelios A. Choulis,^a Thomas D. Anthopoulos,^d Donal D. C. Bradley,^d Jenny Nelson,*^d Christoph J. Brabec*^c and Panayiotis A. Koutentis*^b

Author affiliations

* Corresponding authors

^a Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 3041 Limassol, Cyprus

^b Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus

^c Institute of Materials for Electronics and Energy Technology, Friedrich-Alexander University Erlangen-Nuremberg, 91054 Erlangen, Germany

^d Department of Physics, Imperial College London, London SW7 2AZ, UK

^e Experimental Condensed Matter Physics Laboratory, Department of Physics, University of Cyprus, 1678 Nicosia, Cyprus

Abstract

The optical, electrochemical, morphological and transport properties of a series of thiadiazinone (acceptor) and (thienyl)carbazoles (donor) containing π-extended donor–acceptor–donors (D–A–D) are presented. Systematic variations in the number of the thienyl units, the choice of branched or straight alkyl side chains and the use of a processing additive demonstrate their use as electron donors in bulk heterojunction solar cells blended with fullerene acceptors. The best power conversion efficiency (PCE) of 2.7% is achieved by adding to the D–A–D 3 : fullerene blend a polydimethylsiloxane (PDMS) additive, that improves the morphology and doubles the hole mobility within the D–A–D : fullerene blend.

Journal of Materials Chemistry C

4H-1,2,6-Thiadiazin-4-one-containing small molecule donors and additive effects on their performance in solution-processed organic solar cells†

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4H-1,2,6-Thiadiazin-4-one-containing small molecule donors and additive effects on their performance in solution-processed organic solar cells

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