Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells

Dongki Lee; Jaewon Lee; Dong Hun Sin; Se Gyo Han; Hansol Lee; Wookjin Choi; Hyojung Kim; Jaebum Noh; Jungho Mun; Woong Sung; Sang Woo Kim; Byeong Geun Jeong; Sung Hyuk Kim; Junsuk Rho; Mun Seok Jeong; Kilwon Cho

doi:10.1021/acs.jpcc.1c09233

Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells

Dongki Lee, Jaewon Lee, Dong Hun Sin, Se Gyo Han, Hansol Lee, Wookjin Choi, Hyojung Kim, Jaebum Noh, Jungho Mun, Woong Sung, Sang Woo Kim, Byeong Geun Jeong, Sung Hyuk Kim, Junsuk Rho, Mun Seok Jeong, Kilwon Cho

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

We studied the charge-generation mechanism in low-bandgap polymer (P4TNTz-2F)-fullerene bulk heterojunction (BHJ) organic solar cells (OSCs) using transient absorption (TA) spectroscopy. The highly crystalline nanowire structure of P4TNTz-2F in a blend film prepared with chlorobenzene (CB) and 1,8-diiodooctane (DIO) induced more long-lived charge carriers than those in a blend film prepared with CB only. Pump-wavelength-dependent TA data revealed that the increased charge-delocalization by the intrachain ordering of P4TNTz-2F in the blend film prepared with CB/DIO is the key factor to increasing the OSC efficiency. The intrachain charge-delocalization increased the charge-transfer (CT) state lifetime and suppressed geminate recombination losses, resulting in the efficient dissociation of CT states into free carriers. Our findings provide new insights into the excited-state dynamics study of BHJ blends, which can serve as a good guide for the development of novel OSC materials.

Original language	English
Pages (from-to)	3171-3179
Number of pages	9
Journal	Journal of Physical Chemistry C
Volume	126
Issue number	6
DOIs	https://doi.org/10.1021/acs.jpcc.1c09233
Publication status	Published - 2022 Feb 17

Bibliographical note

Funding Information:
This work was supported by a grant (Code No. 2011-0031628) from the Center for Advanced Soft Electronics under the Global Frontier Research Program of the Korean government Ministry of Science and ICT (MSIT). This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2020R1I1A1A01054660) and the Faculty Research Fund of Sejong University in 2021. This work was also supported by the NRF grants funded by the MSIT (NRF-2019R1A2B5B02070657/NRF-2019M3D1A1078299/NRF-2019R1A2C1086262).

Publisher Copyright:
© 2022 American Chemical Society

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/acs.jpcc.1c09233

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Lee, D., Lee, J., Sin, D. H., Han, S. G., Lee, H., Choi, W., Kim, H., Noh, J., Mun, J., Sung, W., Kim, S. W., Jeong, B. G., Kim, S. H., Rho, J., Jeong, M. S., & Cho, K. (2022). Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells. Journal of Physical Chemistry C, 126(6), 3171-3179. https://doi.org/10.1021/acs.jpcc.1c09233

@article{44a976067a8d4618a63d1e745bf6219d,

title = "Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells",

abstract = "We studied the charge-generation mechanism in low-bandgap polymer (P4TNTz-2F)-fullerene bulk heterojunction (BHJ) organic solar cells (OSCs) using transient absorption (TA) spectroscopy. The highly crystalline nanowire structure of P4TNTz-2F in a blend film prepared with chlorobenzene (CB) and 1,8-diiodooctane (DIO) induced more long-lived charge carriers than those in a blend film prepared with CB only. Pump-wavelength-dependent TA data revealed that the increased charge-delocalization by the intrachain ordering of P4TNTz-2F in the blend film prepared with CB/DIO is the key factor to increasing the OSC efficiency. The intrachain charge-delocalization increased the charge-transfer (CT) state lifetime and suppressed geminate recombination losses, resulting in the efficient dissociation of CT states into free carriers. Our findings provide new insights into the excited-state dynamics study of BHJ blends, which can serve as a good guide for the development of novel OSC materials.",

author = "Dongki Lee and Jaewon Lee and Sin, {Dong Hun} and Han, {Se Gyo} and Hansol Lee and Wookjin Choi and Hyojung Kim and Jaebum Noh and Jungho Mun and Woong Sung and Kim, {Sang Woo} and Jeong, {Byeong Geun} and Kim, {Sung Hyuk} and Junsuk Rho and Jeong, {Mun Seok} and Kilwon Cho",

note = "Funding Information: This work was supported by a grant (Code No. 2011-0031628) from the Center for Advanced Soft Electronics under the Global Frontier Research Program of the Korean government Ministry of Science and ICT (MSIT). This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2020R1I1A1A01054660) and the Faculty Research Fund of Sejong University in 2021. This work was also supported by the NRF grants funded by the MSIT (NRF-2019R1A2B5B02070657/NRF-2019M3D1A1078299/NRF-2019R1A2C1086262). Publisher Copyright: {\textcopyright} 2022 American Chemical Society",

year = "2022",

month = feb,

day = "17",

doi = "10.1021/acs.jpcc.1c09233",

language = "English",

volume = "126",

pages = "3171--3179",

journal = "Journal of Physical Chemistry C",

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T1 - Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells

AU - Lee, Dongki

AU - Lee, Jaewon

AU - Sin, Dong Hun

AU - Han, Se Gyo

AU - Lee, Hansol

AU - Choi, Wookjin

AU - Kim, Hyojung

AU - Noh, Jaebum

AU - Mun, Jungho

AU - Sung, Woong

AU - Kim, Sang Woo

AU - Jeong, Byeong Geun

AU - Kim, Sung Hyuk

AU - Rho, Junsuk

AU - Jeong, Mun Seok

AU - Cho, Kilwon

N1 - Funding Information: This work was supported by a grant (Code No. 2011-0031628) from the Center for Advanced Soft Electronics under the Global Frontier Research Program of the Korean government Ministry of Science and ICT (MSIT). This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2020R1I1A1A01054660) and the Faculty Research Fund of Sejong University in 2021. This work was also supported by the NRF grants funded by the MSIT (NRF-2019R1A2B5B02070657/NRF-2019M3D1A1078299/NRF-2019R1A2C1086262). Publisher Copyright: © 2022 American Chemical Society

PY - 2022/2/17

Y1 - 2022/2/17

N2 - We studied the charge-generation mechanism in low-bandgap polymer (P4TNTz-2F)-fullerene bulk heterojunction (BHJ) organic solar cells (OSCs) using transient absorption (TA) spectroscopy. The highly crystalline nanowire structure of P4TNTz-2F in a blend film prepared with chlorobenzene (CB) and 1,8-diiodooctane (DIO) induced more long-lived charge carriers than those in a blend film prepared with CB only. Pump-wavelength-dependent TA data revealed that the increased charge-delocalization by the intrachain ordering of P4TNTz-2F in the blend film prepared with CB/DIO is the key factor to increasing the OSC efficiency. The intrachain charge-delocalization increased the charge-transfer (CT) state lifetime and suppressed geminate recombination losses, resulting in the efficient dissociation of CT states into free carriers. Our findings provide new insights into the excited-state dynamics study of BHJ blends, which can serve as a good guide for the development of novel OSC materials.

AB - We studied the charge-generation mechanism in low-bandgap polymer (P4TNTz-2F)-fullerene bulk heterojunction (BHJ) organic solar cells (OSCs) using transient absorption (TA) spectroscopy. The highly crystalline nanowire structure of P4TNTz-2F in a blend film prepared with chlorobenzene (CB) and 1,8-diiodooctane (DIO) induced more long-lived charge carriers than those in a blend film prepared with CB only. Pump-wavelength-dependent TA data revealed that the increased charge-delocalization by the intrachain ordering of P4TNTz-2F in the blend film prepared with CB/DIO is the key factor to increasing the OSC efficiency. The intrachain charge-delocalization increased the charge-transfer (CT) state lifetime and suppressed geminate recombination losses, resulting in the efficient dissociation of CT states into free carriers. Our findings provide new insights into the excited-state dynamics study of BHJ blends, which can serve as a good guide for the development of novel OSC materials.

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U2 - 10.1021/acs.jpcc.1c09233

DO - 10.1021/acs.jpcc.1c09233

M3 - Article

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SN - 1932-7447

VL - 126

SP - 3171

EP - 3179

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 6

ER -

Intrachain Delocalization Effect of Charge Carriers on the Charge-Transfer State Dynamics in Organic Solar Cells

Abstract

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