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

doi:10.1021/jacs.1c00584

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

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Abstract

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 language	English (US)
Journal	Journal of the American Chemical Society
DOIs	https://doi.org/10.1021/jacs.1c00584
State	Published - Apr 23 2021

ASJC Scopus subject areas

Biochemistry
Colloid and Surface Chemistry
General Chemistry
Catalysis

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@article{6e985185e2d0490691b68271b0075993,

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

abstract = "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.",

author = "Yifan Dong and Hyojung Cha and Bristow, {Helen L} and Jinho Lee and Aditi Kumar and Tuladhar, {Pabitra Shakya} and Iain McCulloch and Artem Bakulin and Durrant, {James R.}",

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{\textquoteright}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).",

year = "2021",

month = apr,

day = "23",

doi = "10.1021/jacs.1c00584",

language = "English (US)",

journal = "Journal of the American Chemical Society",

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T1 - Correlating Charge-Transfer State Lifetimes with Material Energetics in Polymer:Non-Fullerene Acceptor Organic Solar Cells.

AU - Dong, Yifan

AU - Cha, Hyojung

AU - Bristow, Helen L

AU - Lee, Jinho

AU - Kumar, Aditi

AU - Tuladhar, Pabitra Shakya

AU - McCulloch, Iain

AU - Bakulin, Artem

AU - Durrant, James R.

N1 - 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).

PY - 2021/4/23

Y1 - 2021/4/23

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10754/668903

UR - https://pubs.acs.org/doi/10.1021/jacs.1c00584

U2 - 10.1021/jacs.1c00584

DO - 10.1021/jacs.1c00584

M3 - Article

C2 - 33891817

SN - 0002-7863

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

ER -

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

Abstract

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