Excited state dynamics in cross-linked covalent hybrids of graphene and diketopyrrolopyrrole oligomers revealed via ultrafast pump-probe and 2D spectroscopy

POSTER

Abstract

Cross-linked covalent hybrids of graphene and diketopyrrolopyrrole (TDPP) oligomers were studied via ultrafast pump-probe and 2D electronic spectroscopy with sub 30 femtosecond time resolution. Comparisons between polymerizing (c-EXG-TDPP) and non-polymerizing (EXG-TDPP) hybrids show that charge/energy transfer occurs faster than 50 ps in EXG-TDPP, while the c-EXG-TDPP system quenches within 18 ps. The transient response of c-EXG-TDPP is completely quenched (>99%); full quenching occurs in EXG-TDPP after 1.39 ns. Photocurrent studies of c-EXG-TDPP films show IPCE > 2%, indicating ultrafast charge transfer between the TDPP moeity and graphene.

*A.M.R, F.S., and F.M. acknowledge funding from European Union’s Horizon 2020 (grant agreement No. [816313]). T.G. acknowledges the DFG for the GRK 2204 project "Substitute Materials for Sustainable Energy Technologies" and the Fonds der Chemischen Industrie (FCI) of the VCI for a "Material Cost Allowance".

Presenters

  • Aaron Ross

    • Dipartimento di Fisica, Politecnico di Milano

Authors

  • Aaron Ross

    • Dipartimento di Fisica, Politecnico di Milano

  • Silvio Osella

    • Center of New Technologies, University of Warsaw

  • Peter Topolovsek

    • CNST@PoliMi Milano, Istituto Italiano di Tecnologia

  • Meng Zheng

    • Department of Chemical Sciences, University of Padova

  • Michele Maggini

    • Department of Chemical Sciences, University of Padova

  • Fabio Marangi

    • CNST@PoliMi Milano, Istituto Italiano di Tecnologia

  • Giulio Cerullo

    • Dipartimento di Fisica, Politecnico di Milano
    • Physics, Politecnico di Milano
    • Politecnico di Milano

  • Teresa Gatti

    • Center for Materials Research and Institute of Physical Chemistry, Justus Liebig University Giessen

  • Francesco Scotognella

    • Dipartimento di Fisica, Politecnico di Milano