Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells.

Yifan Dong, Hyojung Cha, Helen L Bristow, Jinho Lee, Aditi Kumar, Pabitra Shakya Tuladhar, Iain McCulloch, Artem Bakulin, James R. Durrant

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Minimizing the energy offset between the lowest exciton and charge-transfer (CT) states is a widely employed strategy to suppress the energy loss (Eg/q - VOC) in polymer:non-fullerene acceptor (NFA) organic solar cells (OSCs). In this work, transient absorption spectroscopy is employed to determine CT state lifetimes in a series of low energy loss polymer:NFA blends. The CT state lifetime is observed to show an inverse energy gap law dependence and decreases as the energy loss is reduced. This behavior is assigned to increased mixing/hybridization between these CT states and shorter-lived singlet excitons of the lower gap component as the energy offset ΔECT-S1 is reduced. This study highlights how achieving longer exciton and CT state lifetimes has the potential for further enhancement of OSC efficiencies.
Original languageEnglish (US)
JournalJournal of the American Chemical Society
StatePublished - Apr 23 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-04-26
Acknowledged KAUST grant number(s): OSR-2015-CRG4-2572, OSR-2018-CRG/CCF-3079, OSR-2018-CRG7-3749.2, OSR-2019-CRG8-4086
Acknowledgements: The authors gratefully acknowledge financial support from the UKRI GCRF project SUNRISE (EP/P032591/1) and EPSRC project ATIP (EP/TO28513/1) and KAUST (OSR-2015-CRG4-2572 and OSR-2018-CRG7-3749.2). H.L.B. and I.M. acknowledge financial support from KAUST, including Office of Sponsored Research (OSR) award nos. OSR-2018-CRG/CCF-3079, OSR-2019-CRG8-4086, and OSR-2018-CRG7-
3749. We acknowledge funding from ERC Synergy Grant SC2 (610115), the European Union’s Horizon 2020 research and innovation program under grant agreement no. 952911, project BOOSTER, and grant agreement no. 862474, project RoLA-FLEX, as well as EPSRC Project EP/T026219/1. H.C. acknowledges financial support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2021R1C1C1009032).

ASJC Scopus subject areas

  • Biochemistry
  • Colloid and Surface Chemistry
  • Chemistry(all)
  • Catalysis


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