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    Exciton and Charge Carrier Dynamics in Highly Crystalline PTQ10:IDIC Organic Solar Cells

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    Embargo End Date:
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    Type
    Article
    Authors
    Cha, Hyojung cc
    Zheng, Yizhen
    Dong, Yifan
    Lee, Hyun Hwi
    Wu, Jiaying
    Bristow, Helen
    Zhang, Jiangbin
    Lee, Harrison Ka Hin
    Tsoi, Wing C.
    Bakulin, Artem A.
    McCulloch, Iain cc
    Durrant, James R.
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2015-CRG4-2572
    Date
    2020-07-21
    Online Publication Date
    2020-07-21
    Print Publication Date
    2020-10
    Embargo End Date
    2021-07-22
    Submitted Date
    2020-04-01
    Permanent link to this record
    http://hdl.handle.net/10754/664397
    
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    Abstract
    Herein the morphology and exciton/charge carrier dynamics in bulk heterojunctions (BHJs) of the donor polymer PTQ10 and molecular acceptor IDIC are investigated. PTQ10:IDIC BHJs are shown to be particularly promising for low cost organic solar cells (OSCs). It is found that both PTQ10 and IDIC show remarkably high crystallinity in optimized BHJs, with GIWAXS data indicating pi-pi stacking coherence lengths of up to 8 nm. Exciton-exciton annihilation studies indicate long exciton diffusion lengths for both neat materials (19 nm for PTQ10 and 9.5 nm for IDIC), enabling efficient exciton separation with half lives of 1 and 3 ps, despite the high degree of phase segregation in this blend. Transient absorption data indicate exciton separation leads to the formation of two spectrally distinct species, assigned to interfacial charge transfer (CT) states and separated charges. CT state decay is correlated with the appearance of additional separate charges, indicating relatively efficient CT state dissociation, attributed to the high crystallinity of this blend. The results emphasize the potential for high material crystallinity to enhance charge separation and collection in OSCs, but also that long exciton diffusion lengths are likely to be essential for efficient exciton separation in such high crystallinity devices.
    Citation
    Cha, H., Zheng, Y., Dong, Y., Lee, H. H., Wu, J., Bristow, H., … Durrant, J. R. (2020). Exciton and Charge Carrier Dynamics in Highly Crystalline PTQ10:IDIC Organic Solar Cells. Advanced Energy Materials, 2001149. doi:10.1002/aenm.202001149
    Sponsors
    The authors gratefully acknowledge funding from supported by KAUST under the Grant Agreement number OSR-2015-CRG4-2572 and the EPSRC/GCRF project SUNRISE (EP/P032591/1). H.C. acknowledges Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2018R1A6A3A03011245). J.Z. acknowledges a Ph.D. scholarship from China Scholarship Council (201503170255). H. H. Lee acknowledges SRC program through National Research Foundation of Korea (NRF) funded by the Korean government (NRF-2015R1A5A1009962). A.A.B is a Royal Society University Research Fellow.
    Publisher
    Wiley
    Journal
    Advanced Energy Materials
    DOI
    10.1002/aenm.202001149
    10.1002/aenm.202070158
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.202001149
    ae974a485f413a2113503eed53cd6c53
    10.1002/aenm.202001149
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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