A New Wide Bandgap Donor Polymer for Efficient Nonfullerene Organic Solar Cells with a Large Open-Circuit Voltage

Yumin Tang, Huiliang Sun, Ziang Wu, Yujie Zhang, Guangye Zhang, Mengyao Su, Xin Zhou, Xia Wu, Weipeng Sun, Xianhe Zhang, Bin Liu, Wei Chen, Qiaogan Liao, Han Young Woo, Xugang Guo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Significant progress has been made in nonfullerene small molecule acceptors (NF-SMAs) that leads to a consistent increase of power conversion efficiency (PCE) of nonfullerene organic solar cells (NF-OSCs). To achieve better compatibility with high-performance NF-SMAs, the direction of molecular design for donor polymers is toward wide bandgap (WBG), tailored properties, and preferentially ecofriendly processability for device fabrication. Here, a weak acceptor unit, methyl 2,5-dibromo-4-fluorothiophene-3-carboxylate (FE-T), is synthesized and copolymerized with benzo[1,2-b:4,5-b′]dithiophene (BDT) to afford a series of nonhalogenated solvent processable WBG polymers P1-P3 with a distinct side chain on FE-T. The incorporation of FE-T leads to polymers with a deep highest occupied molecular orbital (HOMO) level of −5.60−5.70 eV, a complementary absorption to NF-SMAs, and a planar molecular conformation. When combined with the narrow bandgap acceptor ITIC-Th, the solar cell based on P1 with the shortest methyl chain on FE-T achieves a PCE of 11.39% with a large Voc of 1.01 V and a Jsc of 17.89 mA cm−2. Moreover, a PCE of 12.11% is attained for ternary cells based on WBG P1, narrow bandgap PTB7-Th, and acceptor IEICO-4F. These results demonstrate that the new FE-T is a highly promising acceptor unit to construct WBG polymers for efficient NF-OSCs.

Original languageEnglish
Article number1901773
JournalAdvanced Science
DOIs
Publication statusAccepted/In press - 2019 Jan 1

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Open circuit voltage
open circuit voltage
Polymers
Energy gap
solar cells
carboxylates
polymers
Conversion efficiency
Molecular Conformation
Molecules
molecules
Molecular orbitals
Equipment and Supplies
compatibility
Conformations
Organic solar cells
Solar cells
molecular orbitals
Fabrication
fabrication

Keywords

  • complementary absorption
  • donor polymers
  • nonfullerene organic solar cells
  • nonhalogenated solvents
  • wide bandgap

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

A New Wide Bandgap Donor Polymer for Efficient Nonfullerene Organic Solar Cells with a Large Open-Circuit Voltage. / Tang, Yumin; Sun, Huiliang; Wu, Ziang; Zhang, Yujie; Zhang, Guangye; Su, Mengyao; Zhou, Xin; Wu, Xia; Sun, Weipeng; Zhang, Xianhe; Liu, Bin; Chen, Wei; Liao, Qiaogan; Woo, Han Young; Guo, Xugang.

In: Advanced Science, 01.01.2019.

Research output: Contribution to journalArticle

Tang, Y, Sun, H, Wu, Z, Zhang, Y, Zhang, G, Su, M, Zhou, X, Wu, X, Sun, W, Zhang, X, Liu, B, Chen, W, Liao, Q, Woo, HY & Guo, X 2019, 'A New Wide Bandgap Donor Polymer for Efficient Nonfullerene Organic Solar Cells with a Large Open-Circuit Voltage', Advanced Science. https://doi.org/10.1002/advs.201901773
Tang, Yumin ; Sun, Huiliang ; Wu, Ziang ; Zhang, Yujie ; Zhang, Guangye ; Su, Mengyao ; Zhou, Xin ; Wu, Xia ; Sun, Weipeng ; Zhang, Xianhe ; Liu, Bin ; Chen, Wei ; Liao, Qiaogan ; Woo, Han Young ; Guo, Xugang. / A New Wide Bandgap Donor Polymer for Efficient Nonfullerene Organic Solar Cells with a Large Open-Circuit Voltage. In: Advanced Science. 2019.
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abstract = "Significant progress has been made in nonfullerene small molecule acceptors (NF-SMAs) that leads to a consistent increase of power conversion efficiency (PCE) of nonfullerene organic solar cells (NF-OSCs). To achieve better compatibility with high-performance NF-SMAs, the direction of molecular design for donor polymers is toward wide bandgap (WBG), tailored properties, and preferentially ecofriendly processability for device fabrication. Here, a weak acceptor unit, methyl 2,5-dibromo-4-fluorothiophene-3-carboxylate (FE-T), is synthesized and copolymerized with benzo[1,2-b:4,5-b′]dithiophene (BDT) to afford a series of nonhalogenated solvent processable WBG polymers P1-P3 with a distinct side chain on FE-T. The incorporation of FE-T leads to polymers with a deep highest occupied molecular orbital (HOMO) level of −5.60−5.70 eV, a complementary absorption to NF-SMAs, and a planar molecular conformation. When combined with the narrow bandgap acceptor ITIC-Th, the solar cell based on P1 with the shortest methyl chain on FE-T achieves a PCE of 11.39{\%} with a large Voc of 1.01 V and a Jsc of 17.89 mA cm−2. Moreover, a PCE of 12.11{\%} is attained for ternary cells based on WBG P1, narrow bandgap PTB7-Th, and acceptor IEICO-4F. These results demonstrate that the new FE-T is a highly promising acceptor unit to construct WBG polymers for efficient NF-OSCs.",
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AU - Zhou, Xin

AU - Wu, Xia

AU - Sun, Weipeng

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