Charge carrier dynamics in small-molecule- And polymer-based donor-acceptor blends

Keshab Paudel, Brian Johnson, Mattson Thieme, John E. Anthony, Oksana Ostroverkhova

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


We present a comparative study of optical absorption, photoluminescence (PL), and photoconductivity in bulk heterojunctions comprising a high performance functionalized anthradithiophene (ADT) derivative or the benchmark polymer P3HT as donor and functionalized pentacene (Pn) derivative or PCBM as acceptor. Of all D/A blends studied, the ADT/PCBM blend exhibited the highest charge photogeneration efficiencies under 532 nm excitation, leading to the highest amplitudes of time-resolved and continuous wave (cw) photocurrents. At nanosecond time scales after photoexcitation, both ADT-TES-F-based blends and the P3HT/Pn-TIPS-F8 blend exhibited photocurrents which were higher by a factor of 2-10, depending on the blend, than that in the P3HT/PCBM blend. However, cw photocurrents showed a different trend, with the ADT-TES-F/PCBM blend exhibiting only a factor of-2.5 higher photoresponse than that in the P3HT/PCBM blends, and the ADT-TES-F- And P3HT- based blends with Pn-TIPS-F8 showing a factor of-1.5-2.5 lower photoresponse than that in the P3HT/PCBM blend, due to other contributions, such as that of charge trap-limited transport, to cw photoresponse.

Original languageEnglish
Title of host publicationFundamentals of Organic Semiconductors - Synthesis, Morphology, Devices and Theory
EditorsD. Seferos, L. Kozycz
Number of pages6
ISBN (Electronic)9781510806146
StatePublished - 2015
Event2014 MRS Fall Meeting - Boston, United States
Duration: Nov 30 2014Dec 5 2014

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Conference2014 MRS Fall Meeting
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2015 Materials Research Society.

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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