TY - GEN
T1 - Charge carrier dynamics in small-molecule- And polymer-based donor-acceptor blends
AU - Paudel, Keshab
AU - Johnson, Brian
AU - Thieme, Mattson
AU - Anthony, John E.
AU - Ostroverkhova, Oksana
N1 - Publisher Copyright:
© 2015 Materials Research Society.
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/84938829973
UR - https://www.scopus.com/pages/publications/84938829973#tab=citedBy
U2 - 10.1557/opl.2014.956
DO - 10.1557/opl.2014.956
M3 - Conference contribution
AN - SCOPUS:84938829973
T3 - Materials Research Society Symposium Proceedings
SP - 13
EP - 18
BT - Fundamentals of Organic Semiconductors - Synthesis, Morphology, Devices and Theory
A2 - Seferos, D.
A2 - Kozycz, L.
T2 - 2014 MRS Fall Meeting
Y2 - 30 November 2014 through 5 December 2014
ER -