Quinoxaline-based D-A conjugated polymers for organic solar cells: Probing the effect of quinoxaline side chains and fluorine substitution on the power conversion efficiency

Suna Choi; Gi Eun Park; Dae Hee Lee; Mallesham Godumala; Min Ju Cho; Dong Hoon Choi

doi:10.1002/pola.28483

Quinoxaline-based D-A conjugated polymers for organic solar cells: Probing the effect of quinoxaline side chains and fluorine substitution on the power conversion efficiency

Suna Choi, Gi Eun Park, Dae Hee Lee, Mallesham Godumala, Min Ju Cho, Dong Hoon Choi

Department of Chemistry

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

8 Citations (Scopus)

Abstract

We describe the successful synthesis of four novel donor-acceptor (D-A) type copolymers, referred to as PQxBT, PQxFBT, TQxBT, and TQxFBT. The effects of using a fluorinated bithiophene (FBT) and varying the side-chain moieties tethered to the quinoxaline (Qx) unit (electron-withdrawing group in the polymer backbone) on the physical properties and photovoltaic performance were investigated. Specifically, the four polymers were synthesized using either alkoxyphenyl (P) or alkylthiophene (T) units anchored to the quinoxaline in the polymer backbone. The FBT-bearing polymers, PQxFBT and TQxFBT, displayed more redshifted absorption spectra and higher crystallinity owing to the greater planarity of their polymer backbone as compared to the non-fluorinated polymers. The TQxFBT copolymer, equipped with both the alkylthiophene side chains and FBT, exhibited face-on orientation in film state and a well-mixed nanophase morphology in TQxFBT:PC₇₁BM blend films. The photovoltaic device fabricated from TQxFBT:PC₇₁BM exhibited the highest power conversion efficiency of 4.18%.

Original language	English
Pages (from-to)	1209-1218
Number of pages	10
Journal	Journal of Polymer Science, Part A: Polymer Chemistry
Volume	55
Issue number	7
DOIs	https://doi.org/10.1002/pola.28483
Publication status	Published - 2017 Apr 1

Keywords

conjugated copolymer
fluorinated moiety
polymer solar cell
quinoxaline

ASJC Scopus subject areas

Polymers and Plastics
Organic Chemistry
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1002/pola.28483

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Quinoxaline-based D-A conjugated polymers for organic solar cells : Probing the effect of quinoxaline side chains and fluorine substitution on the power conversion efficiency. / Choi, Suna; Park, Gi Eun; Lee, Dae Hee et al.

In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 55, No. 7, 01.04.2017, p. 1209-1218.

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

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title = "Quinoxaline-based D-A conjugated polymers for organic solar cells: Probing the effect of quinoxaline side chains and fluorine substitution on the power conversion efficiency",

abstract = "We describe the successful synthesis of four novel donor-acceptor (D-A) type copolymers, referred to as PQxBT, PQxFBT, TQxBT, and TQxFBT. The effects of using a fluorinated bithiophene (FBT) and varying the side-chain moieties tethered to the quinoxaline (Qx) unit (electron-withdrawing group in the polymer backbone) on the physical properties and photovoltaic performance were investigated. Specifically, the four polymers were synthesized using either alkoxyphenyl (P) or alkylthiophene (T) units anchored to the quinoxaline in the polymer backbone. The FBT-bearing polymers, PQxFBT and TQxFBT, displayed more redshifted absorption spectra and higher crystallinity owing to the greater planarity of their polymer backbone as compared to the non-fluorinated polymers. The TQxFBT copolymer, equipped with both the alkylthiophene side chains and FBT, exhibited face-on orientation in film state and a well-mixed nanophase morphology in TQxFBT:PC71BM blend films. The photovoltaic device fabricated from TQxFBT:PC71BM exhibited the highest power conversion efficiency of 4.18%.",

keywords = "conjugated copolymer, fluorinated moiety, polymer solar cell, quinoxaline",

author = "Suna Choi and Park, {Gi Eun} and Lee, {Dae Hee} and Mallesham Godumala and Cho, {Min Ju} and Choi, {Dong Hoon}",

note = "Funding Information: This research was supported by the National Research Foundation of Korea (NRF2012R1A2A1A01008797) and from Key Research Institute Program (NRF20100020209). Grazing incidence X-ray diffraction (GI-XRD) measurements were performed using Beam line 9A at the Pohang Accelerator Laboratory (Pohang, Korea). We also thank KBSI for allowing the use of their HRTEM instrument.",

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AU - Lee, Dae Hee

AU - Godumala, Mallesham

AU - Cho, Min Ju

AU - Choi, Dong Hoon

N1 - Funding Information: This research was supported by the National Research Foundation of Korea (NRF2012R1A2A1A01008797) and from Key Research Institute Program (NRF20100020209). Grazing incidence X-ray diffraction (GI-XRD) measurements were performed using Beam line 9A at the Pohang Accelerator Laboratory (Pohang, Korea). We also thank KBSI for allowing the use of their HRTEM instrument.

PY - 2017/4/1

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N2 - We describe the successful synthesis of four novel donor-acceptor (D-A) type copolymers, referred to as PQxBT, PQxFBT, TQxBT, and TQxFBT. The effects of using a fluorinated bithiophene (FBT) and varying the side-chain moieties tethered to the quinoxaline (Qx) unit (electron-withdrawing group in the polymer backbone) on the physical properties and photovoltaic performance were investigated. Specifically, the four polymers were synthesized using either alkoxyphenyl (P) or alkylthiophene (T) units anchored to the quinoxaline in the polymer backbone. The FBT-bearing polymers, PQxFBT and TQxFBT, displayed more redshifted absorption spectra and higher crystallinity owing to the greater planarity of their polymer backbone as compared to the non-fluorinated polymers. The TQxFBT copolymer, equipped with both the alkylthiophene side chains and FBT, exhibited face-on orientation in film state and a well-mixed nanophase morphology in TQxFBT:PC71BM blend films. The photovoltaic device fabricated from TQxFBT:PC71BM exhibited the highest power conversion efficiency of 4.18%.

AB - We describe the successful synthesis of four novel donor-acceptor (D-A) type copolymers, referred to as PQxBT, PQxFBT, TQxBT, and TQxFBT. The effects of using a fluorinated bithiophene (FBT) and varying the side-chain moieties tethered to the quinoxaline (Qx) unit (electron-withdrawing group in the polymer backbone) on the physical properties and photovoltaic performance were investigated. Specifically, the four polymers were synthesized using either alkoxyphenyl (P) or alkylthiophene (T) units anchored to the quinoxaline in the polymer backbone. The FBT-bearing polymers, PQxFBT and TQxFBT, displayed more redshifted absorption spectra and higher crystallinity owing to the greater planarity of their polymer backbone as compared to the non-fluorinated polymers. The TQxFBT copolymer, equipped with both the alkylthiophene side chains and FBT, exhibited face-on orientation in film state and a well-mixed nanophase morphology in TQxFBT:PC71BM blend films. The photovoltaic device fabricated from TQxFBT:PC71BM exhibited the highest power conversion efficiency of 4.18%.

KW - conjugated copolymer

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Quinoxaline-based D-A conjugated polymers for organic solar cells: Probing the effect of quinoxaline side chains and fluorine substitution on the power conversion efficiency

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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