A triphenylamine-based push-pull – σ – C60 dyad as photoactive molecular material for single-component organic solar cells: synthesis, characterizations and photophysical properties

Antoine Labrunie, Julien Gorenflot, Maxime Babics, Olivier Aleveque, Sylvie Dabos-Seignon, Ahmed Albalawi, Zhipeng Kan, Markus Wohlfahrt, Eric Levillain, Pietrick Hudhomme, Pierre Beaujuge, Frédéric Laquai, Clément Cabanetos, Philippe Blanchard

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

A push-pull – σ – C60 molecular dyad was synthesized via Huisgen-type click-chemistry and used as photoactive material for single-component organic solar cells. Steady-state photoluminescence (PL) experiments of the dyad in solution show a significant quenching of the emission of the push-pull moiety. Spin-casting of a solution of the dyad results in homogenous and smooth thin-films, which exhibit complete PL quenching in line with ultrafast photo-induced electron-transfer in the solid-state. Spectro-electrochemistry reveals the optical signatures of radical cations and radical anions. Evaluation of the charge carrier mobility by space-charge limited current measurements gives an electron-mobility of μe = 4.3 × 10-4 cm2 V-1 s-1, ca. 50 times higher than the hole-mobility. Single-component organic solar cells yield an open-circuit voltage Voc of 0.73 V and a short-circuit current density of 2.1 mA cm-2 however, a poor fill-factor FF (29%) is obtained, resulting in low power conversion efficiency of only 0.4%. Combined TA and time-delayed collection field (TDCF) experiments show mostly ultrafast photon-to-charge conversion and a small component of diffusion-limited exciton dissociation, revealing the presence of pure fullerene domains. Furthermore, a strong field dependence of charge generation is observed, governing the device fill factor, which is further reduced by a competition between extraction and fast recombination of separated charges.
Original languageEnglish (US)
Pages (from-to)3474-3485
Number of pages12
JournalChemistry of Materials
Volume30
Issue number10
DOIs
StatePublished - Apr 23 2018

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