TY - GEN
T1 - Effects of energy offsets and molecular packing on exciton and charge carrier dynamics in small-molecule donor-acceptor composites
AU - Paudel, Keshab
AU - Johnson, Brian
AU - Neunzert, Afina
AU - Thieme, Mattson
AU - Anthony, John
AU - Ostroverkhova, Oksana
PY - 2013
Y1 - 2013
N2 - We present a study of optical, photoluminescent (PL), and photoconductive properties of small-molecule D/A bulk heterojunctions of functionalized fluorinated anthradithiophene (ADT-R-F) and pentacene (Pn-R-F8) derivatives. We chose one of the ADT derivatives, ADT-TES-F, which exhibits a 2D brick-work p-stacking, as the donor, and ADT-TIPS-F (2D brick-work), ADT-TSBS-F (1D sandwich-herringbone), Pn-TIPS-F8 (2D brick-work), or Pn-TCHS-F8 (1D sandwich-herringbone), as acceptors. We measured PL and photoconductivity at time scales from sub-nanoseconds to many seconds after photoexcitation, at various acceptor concentrations, under various experimental conditions. The choice of acceptors enabled us to distinguish between effects of the LUMO energy offsets between the donor and acceptor molecules and those of the molecular packing in the acceptor domains on exciton and charge carrier dynamics.
AB - We present a study of optical, photoluminescent (PL), and photoconductive properties of small-molecule D/A bulk heterojunctions of functionalized fluorinated anthradithiophene (ADT-R-F) and pentacene (Pn-R-F8) derivatives. We chose one of the ADT derivatives, ADT-TES-F, which exhibits a 2D brick-work p-stacking, as the donor, and ADT-TIPS-F (2D brick-work), ADT-TSBS-F (1D sandwich-herringbone), Pn-TIPS-F8 (2D brick-work), or Pn-TCHS-F8 (1D sandwich-herringbone), as acceptors. We measured PL and photoconductivity at time scales from sub-nanoseconds to many seconds after photoexcitation, at various acceptor concentrations, under various experimental conditions. The choice of acceptors enabled us to distinguish between effects of the LUMO energy offsets between the donor and acceptor molecules and those of the molecular packing in the acceptor domains on exciton and charge carrier dynamics.
KW - Bulk heterojunctions
KW - Exciplex
KW - Organic donor-acceptor materials
KW - Organic semiconductors
KW - Photoconductivity
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U2 - 10.1117/12.2023402
DO - 10.1117/12.2023402
M3 - Conference contribution
AN - SCOPUS:84886653428
SN - 9780819496775
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Optical Processes in Organic Materials and Nanostructures II
T2 - Optical Processes in Organic Materials and Nanostructures II
Y2 - 25 August 2013 through 28 August 2013
ER -