EPJ Web of Conferences (Jan 2020)

Revealing excited states dynamics in cross-linked covalent hybrids of graphene and diketopyrrolopyrrole oligomers via ultrafast transient absorption spectroscopy

  • Ross Aaron M.,
  • Zheng Meng,
  • Maggini Michele,
  • Marangi Fabio,
  • Cerullo Giulio,
  • Gatti Teresa,
  • Scotognella Francesco

DOI
https://doi.org/10.1051/epjconf/202023807007
Journal volume & issue
Vol. 238
p. 07007

Abstract

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We report on ultrafast dynamics in cross-linked covalent hybrids of graphene and diketopyrrolopyrrole (TDPP) oligomers. Comparisons between non-polymerizing (EXG-TDPP) and polymerizing (c-EXG-TDPP) hybrids show that charge/energy transfer occurs faster than 50 ps in EXGTDPP, while the c-EXG-TDPP system shows quenching within 18 ps. The transient response of c-EXGTDPP is completely quenched (>99%), while in EXG-TDPP full quenching occurs after 1.39 ns. Photocurrent studies of c-EXG-TDPP films show IPCE > 2%, indicating ultrafast charge transfer between TDPP and graphene.