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

Published online by Cambridge University Press:  30 December 2014

Keshab Paudel ,
Brian Johnson ,
Mattson Thieme ,
John E. Anthony  and
Oksana Ostroverkhova
Keshab Paudel
Affiliation:
Oregon State University, Corvallis, OR, United States.
Brian Johnson
Affiliation:
Oregon State University, Corvallis, OR, United States.
Mattson Thieme
Affiliation:
Oregon State University, Corvallis, OR, United States.
John E. Anthony
Affiliation:
University of Kentucky, Lexington, KY, United States.
Oksana Ostroverkhova
Affiliation:
Oregon State University, Corvallis, OR, United States.
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Abstract

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.

Keywords

photoconductivityorganicoptoelectronic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1733: Symposium Q – Fundamentals of Organic Semiconductors—Synthesis, Morphology, Devices and Theory , 2014 , mrsf14-1733-q10-05
Copyright
Copyright © Materials Research Society 2014 

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