Exciton and Charge Carrier Dynamics in Highly Crystalline PTQ10:IDIC Organic Solar Cells
Lee, Hyun Hwi
Lee, Harrison Ka Hin
Tsoi, Wing C.
Bakulin, Artem A.
Durrant, James R.
KAUST DepartmentChemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
KAUST Grant NumberOSR-2015-CRG4-2572
Embargo End Date2021-07-22
Permanent link to this recordhttp://hdl.handle.net/10754/664397
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AbstractHerein 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.
CitationCha, 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
SponsorsThe 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.
JournalAdvanced Energy Materials