A Benzobis(thiazole)-Based Copolymer for Highly Efficient Non-Fullerene Polymer Solar Cells

Shuguang Wen, Yi Li, Thomas Rath, Yonghai Li, Yao Wu, Xichang Bao, Liangliang Han, Heike Ehmann, Gregor Trimmel, Yong Zhang, Renqiang Yang

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In recent years, non-fullerene polymer solar cells have attracted much attention due to their great potential for achieving high power conversion efficiencies, and in addition to the already existing donor polymers, varieties of excellent acceptors have been developed. To further improve the performance, the main challenge is now to identify perfect donor-acceptor pairs with suitable electronic properties and complementary optical absorption. In this article, we have investigated a donor-acceptor alternating copolymer poly[(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene)-2,6-diyl-alt-(2,6-bis(5-bromo-4-(2-butyloctyl) thiophen-2-yl)benzo[1,2-d:4,5-d′]bis(thiazole))] with benzo[1,2-d:4,5-d′]bis(thiazole) (BBT) as the accepting unit and benzo[1,2-b:4,5-b′]dithiophene as the donor unit. The polymer shows a wide band gap of 2.1 eV with absorption peaks at 515 and 554 nm, matching well with the strongest region of the solar radiation spectrum. A blend of this polymer with the narrow-bandgap acceptor ITIC-F, (3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-6-fluoro-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene)(mixture with 7-fluoro-indanone isomer), as the active layer in combination with a solvent vapor annealing process led to solar cells exhibiting a high efficiency of 13.3% with an open-circuit voltage of 0.91 V, a short current density of 20.9 mA cm -2 , and a fill factor of 0.70. The solvent vapor annealing method led to an improvement of the molecular packing, exciton dissociation, and charge transport, thus enhancing the power conversion efficiency. It is noteworthy that external quantum efficiency spectra show excellent photoresponse, especially in the wavelength range from 430 to 570 nm, demonstrating that this donor-acceptor combination efficiently absorbs in the wavelength range where the solar radiation spectrum has its maximum. The results indicate that polymers based on BBT are very promising candidates for high-performance non-fullerene polymer solar cells.

Original languageEnglish
Pages (from-to)919-926
Number of pages8
JournalChemistry of Materials
Volume31
Issue number3
DOIs
Publication statusPublished - 12 Feb 2019

Fingerprint

Thiazoles
Polymers
Copolymers
Solar radiation
Conversion efficiency
Energy gap
Vapors
Annealing
Wavelength
Open circuit voltage
Quantum efficiency
Excitons
Isomers
Electronic properties
Light absorption
Charge transfer
Solar cells
Current density
Polymer solar cells
indacrinone

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Fields of Expertise

  • Advanced Materials Science

Cite this

A Benzobis(thiazole)-Based Copolymer for Highly Efficient Non-Fullerene Polymer Solar Cells. / Wen, Shuguang; Li, Yi; Rath, Thomas; Li, Yonghai; Wu, Yao; Bao, Xichang; Han, Liangliang; Ehmann, Heike; Trimmel, Gregor; Zhang, Yong; Yang, Renqiang.

In: Chemistry of Materials, Vol. 31, No. 3, 12.02.2019, p. 919-926.

Research output: Contribution to journalArticleResearchpeer-review

Wen, Shuguang ; Li, Yi ; Rath, Thomas ; Li, Yonghai ; Wu, Yao ; Bao, Xichang ; Han, Liangliang ; Ehmann, Heike ; Trimmel, Gregor ; Zhang, Yong ; Yang, Renqiang. / A Benzobis(thiazole)-Based Copolymer for Highly Efficient Non-Fullerene Polymer Solar Cells. In: Chemistry of Materials. 2019 ; Vol. 31, No. 3. pp. 919-926.
@article{8de548b0f4a9445989ba1a6ccafe3a66,
title = "A Benzobis(thiazole)-Based Copolymer for Highly Efficient Non-Fullerene Polymer Solar Cells",
abstract = "In recent years, non-fullerene polymer solar cells have attracted much attention due to their great potential for achieving high power conversion efficiencies, and in addition to the already existing donor polymers, varieties of excellent acceptors have been developed. To further improve the performance, the main challenge is now to identify perfect donor-acceptor pairs with suitable electronic properties and complementary optical absorption. In this article, we have investigated a donor-acceptor alternating copolymer poly[(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene)-2,6-diyl-alt-(2,6-bis(5-bromo-4-(2-butyloctyl) thiophen-2-yl)benzo[1,2-d:4,5-d′]bis(thiazole))] with benzo[1,2-d:4,5-d′]bis(thiazole) (BBT) as the accepting unit and benzo[1,2-b:4,5-b′]dithiophene as the donor unit. The polymer shows a wide band gap of 2.1 eV with absorption peaks at 515 and 554 nm, matching well with the strongest region of the solar radiation spectrum. A blend of this polymer with the narrow-bandgap acceptor ITIC-F, (3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-6-fluoro-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene)(mixture with 7-fluoro-indanone isomer), as the active layer in combination with a solvent vapor annealing process led to solar cells exhibiting a high efficiency of 13.3{\%} with an open-circuit voltage of 0.91 V, a short current density of 20.9 mA cm -2 , and a fill factor of 0.70. The solvent vapor annealing method led to an improvement of the molecular packing, exciton dissociation, and charge transport, thus enhancing the power conversion efficiency. It is noteworthy that external quantum efficiency spectra show excellent photoresponse, especially in the wavelength range from 430 to 570 nm, demonstrating that this donor-acceptor combination efficiently absorbs in the wavelength range where the solar radiation spectrum has its maximum. The results indicate that polymers based on BBT are very promising candidates for high-performance non-fullerene polymer solar cells.",
author = "Shuguang Wen and Yi Li and Thomas Rath and Yonghai Li and Yao Wu and Xichang Bao and Liangliang Han and Heike Ehmann and Gregor Trimmel and Yong Zhang and Renqiang Yang",
year = "2019",
month = "2",
day = "12",
doi = "10.1021/acs.chemmater.8b04265",
language = "English",
volume = "31",
pages = "919--926",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "ACS Publications",
number = "3",

}

TY - JOUR

T1 - A Benzobis(thiazole)-Based Copolymer for Highly Efficient Non-Fullerene Polymer Solar Cells

AU - Wen, Shuguang

AU - Li, Yi

AU - Rath, Thomas

AU - Li, Yonghai

AU - Wu, Yao

AU - Bao, Xichang

AU - Han, Liangliang

AU - Ehmann, Heike

AU - Trimmel, Gregor

AU - Zhang, Yong

AU - Yang, Renqiang

PY - 2019/2/12

Y1 - 2019/2/12

N2 - In recent years, non-fullerene polymer solar cells have attracted much attention due to their great potential for achieving high power conversion efficiencies, and in addition to the already existing donor polymers, varieties of excellent acceptors have been developed. To further improve the performance, the main challenge is now to identify perfect donor-acceptor pairs with suitable electronic properties and complementary optical absorption. In this article, we have investigated a donor-acceptor alternating copolymer poly[(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene)-2,6-diyl-alt-(2,6-bis(5-bromo-4-(2-butyloctyl) thiophen-2-yl)benzo[1,2-d:4,5-d′]bis(thiazole))] with benzo[1,2-d:4,5-d′]bis(thiazole) (BBT) as the accepting unit and benzo[1,2-b:4,5-b′]dithiophene as the donor unit. The polymer shows a wide band gap of 2.1 eV with absorption peaks at 515 and 554 nm, matching well with the strongest region of the solar radiation spectrum. A blend of this polymer with the narrow-bandgap acceptor ITIC-F, (3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-6-fluoro-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene)(mixture with 7-fluoro-indanone isomer), as the active layer in combination with a solvent vapor annealing process led to solar cells exhibiting a high efficiency of 13.3% with an open-circuit voltage of 0.91 V, a short current density of 20.9 mA cm -2 , and a fill factor of 0.70. The solvent vapor annealing method led to an improvement of the molecular packing, exciton dissociation, and charge transport, thus enhancing the power conversion efficiency. It is noteworthy that external quantum efficiency spectra show excellent photoresponse, especially in the wavelength range from 430 to 570 nm, demonstrating that this donor-acceptor combination efficiently absorbs in the wavelength range where the solar radiation spectrum has its maximum. The results indicate that polymers based on BBT are very promising candidates for high-performance non-fullerene polymer solar cells.

AB - In recent years, non-fullerene polymer solar cells have attracted much attention due to their great potential for achieving high power conversion efficiencies, and in addition to the already existing donor polymers, varieties of excellent acceptors have been developed. To further improve the performance, the main challenge is now to identify perfect donor-acceptor pairs with suitable electronic properties and complementary optical absorption. In this article, we have investigated a donor-acceptor alternating copolymer poly[(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene)-2,6-diyl-alt-(2,6-bis(5-bromo-4-(2-butyloctyl) thiophen-2-yl)benzo[1,2-d:4,5-d′]bis(thiazole))] with benzo[1,2-d:4,5-d′]bis(thiazole) (BBT) as the accepting unit and benzo[1,2-b:4,5-b′]dithiophene as the donor unit. The polymer shows a wide band gap of 2.1 eV with absorption peaks at 515 and 554 nm, matching well with the strongest region of the solar radiation spectrum. A blend of this polymer with the narrow-bandgap acceptor ITIC-F, (3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-6-fluoro-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene)(mixture with 7-fluoro-indanone isomer), as the active layer in combination with a solvent vapor annealing process led to solar cells exhibiting a high efficiency of 13.3% with an open-circuit voltage of 0.91 V, a short current density of 20.9 mA cm -2 , and a fill factor of 0.70. The solvent vapor annealing method led to an improvement of the molecular packing, exciton dissociation, and charge transport, thus enhancing the power conversion efficiency. It is noteworthy that external quantum efficiency spectra show excellent photoresponse, especially in the wavelength range from 430 to 570 nm, demonstrating that this donor-acceptor combination efficiently absorbs in the wavelength range where the solar radiation spectrum has its maximum. The results indicate that polymers based on BBT are very promising candidates for high-performance non-fullerene polymer solar cells.

UR - https://doi.org/10.1021/acs.chemmater.8b04265

UR - http://www.scopus.com/inward/record.url?scp=85060824587&partnerID=8YFLogxK

U2 - 10.1021/acs.chemmater.8b04265

DO - 10.1021/acs.chemmater.8b04265

M3 - Article

VL - 31

SP - 919

EP - 926

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 3

ER -