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  • Li, YuxiangKorea University,Xi'an University of Science and Technology (author)

Influence of backbone modification of difluoroquinoxaline-based copolymers on the interchain packing, blend morphology and photovoltaic properties of nonfullerene organic solar cells

  • Article/chapterEnglish2019

Publisher, publication year, extent ...

  • 2019
  • Royal Society of Chemistry (RSC),2019

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:101a6ce4-3060-4969-bb21-8cbb7e0d1595
  • https://research.chalmers.se/publication/508716URI
  • https://doi.org/10.1039/c8tc06206dDOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • In order to understand the influence of molecular ordering and orientation on the performance of nonfullerene (NF) solar cells, we synthesized a series of difluoroquinoxaline-based alternating copolymers: starting from poly(2,2′-bithiophene-alt-(2,3-bis(3,4-bis(octyloxy)phenyl)-6,7-difluoroquinoxaline)) (PDFQx-2T), we modified the polymeric backbone by incorporating fluorine atoms (PDFQx-2T2F) or thiophene (PDFQx-3T) or a benzene ring (PDFQx-2TB) in the bithiophene comonomeric unit. The structure modification significantly affected the photovoltaic performance with power conversion efficiencies (PCEs) of 3.95% for PDFQx-2TB:ITIC, 4.82% for PDFQx-2T:ITIC, 4.93% for PDFQx-2T2F:ITIC and 8.13% for PDFQx-3T:ITIC. The dramatic increase in the PCE of PDFQx-3T:ITIC was attributed to improvements in the short-circuit current density (J SC ) and fill factor (FF). From the resonant soft X-ray scattering and grazing incidence X-ray scattering measurements, the PDFQx-3T polymers had well-developed, face-on oriented crystallites, allowing the formation of face-to-face alignment with the face-on ordered ITIC molecules at the interfaces. Also, the PDFQx-3T:ITIC blend films exhibited well intermixed blend morphology with smaller domain spacings. These combined features contributed to efficient charge generation with the highest exciton dissociation probability among the four different polymer:ITIC systems. In addition, dominant face-on orientation of both PDFQx-3T polymers and ITIC acceptors with a balanced crystalline coherence length ratio (CCL polymer /CCL ITIC ) (0.87, based on the out-of-plane (010) diffraction peaks of PDFQx polymers and ITIC acceptors) led to a more balanced charge mobility than other blends, explaining the highest J SC and FF in the PDFQx-3T:ITIC NF devices.

Subject headings and genre

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  • Kim, MinseokKorea Advanced Institute of Science and Technology (KAIST) (author)
  • Wu, ZiangKorea University (author)
  • Lee, ChangyeonKorea Advanced Institute of Science and Technology (KAIST) (author)
  • Lee, Young WoongKorea University (author)
  • Lee, Jin WooKorea Advanced Institute of Science and Technology (KAIST) (author)
  • Lee, Young JunKorea Advanced Institute of Science and Technology (KAIST) (author)
  • Wang, Ergang,1981Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ergang (author)
  • Kim, Bumjoon J.Korea Advanced Institute of Science and Technology (KAIST) (author)
  • Woo, Han YoungKorea University (author)
  • Korea UniversityXi'an University of Science and Technology (creator_code:org_t)

Related titles

  • In:Journal of Materials Chemistry C: Royal Society of Chemistry (RSC)7:6, s. 1681-16892050-75342050-7526

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