Cited by 39Organic Electronics and PhotovoltaicsOrganic Light-Emitting Diodes ResearchPhotodynamic Therapy Research Studies

Improved Photovoltaic Properties of Donor–Acceptor Copolymers by Introducing Quinoxalino[2,3-b′]porphyrin as a Light-Harvesting Unit

Wang, Liwei, Shi, Shaowei, Ma, Di, Chen, Song, Gao, Chen, Wang, Meng, Shi, Keli, Li, Yongfang +2 more·2015·Macromolecules

Abstract

Donor–acceptor (D–A) copolymerization is an effective approach to construct low bandgap polymers with tunable electronic energy levels for the application as donor materials in polymer solar cells (PSCs). Usually, D–A copolymers possess an intramolecular charge transfer absorption band at long wavelength direction, so that the absorption of the polymers is broadened. However, absorption at short wavelength direction is also important and should be broadened and enhanced to increase the short-circuit current density ( J sc ) of the PSCs. In this study, a series of low bandgap conjugated polymers, P(QP4-BT-DPP1), P(QP1-BT-DPP1), and P(QP1-BT-DPP4), based on two acceptor units quinoxalino[2,3- b ′]porphyrin (QP) and diketopyrrolopyrrole (DPP) connected by oligothiophene donor units, were designed and synthesized by palladium-catalyzed Stille-coupling polymerization. As a complementary light-harvesting unit, QP was first introduced into the D–A conjugated polymers for improving the photovoltaic performance of PSCs. The incorporation of QP broadened and enhanced the absorptions of short wavelength photons as well as kept the well-tuned electronic energy levels and bandgap of the pristine D–A copolymer. Moreover, para-linked QP improved coplanarity and extended π-conjugation along the polymer backbone. As a result, P(QP1-BT-DPP4) with a proper feed ratio (10 mol %) of QP showed an increased J sc of 11.85 mA/cm 2 without sacrificing open-circuit voltage ( V oc ) or fill factor (FF)…

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Crossref · 10.1021/ma502050b

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  • A36 with a high DPP ratio showed a higher performance (PCE = 5.07%) because of a high Jsc of 11.85 mA cm-2 resulting from its excellent absorption.

    “A36 with a high DPP ratio showed a higher performance (PCE ¼ 5.07%) because of a high J sc of 11.85 mA cm 2 which resulted from its excellent absorption.”
  • The different performances of these polymers are also related to crystallinity, and an increase of the QP ratio leads to a less ordered structure because of the hindrance of the bulky QP unit.

    “In addition, the di ff erent performances of these polymers are also related to the crystallinity, and the increase of the ratio of QP leads to a less ordered structure because of the hindrance of the bulky QP unit.”
  • A36 with just one QP unit shows a sharper diffraction peak as an indicator of a highly crystalline blend film.

    “A36 with just one QP unit shows a sharper di ff raction peak as an indicator of a highly crystalline blend  lm.”
  • A34 with a high ratio of quinoxalino[2,3b]porphyrin showed an inferior performance that can be explained by weak absorption and a large band-gap.

    “A34 with a high ratio of quinoxalino[2,3b ]porphyrin (QP) showed an inferior performance that can be explained by the weak absorption and large band-gap. 43”
  • They synthesized three polymers A34-A36 by Stille coupling polymerization and used them as donors with PC71BM in BHJ OSCs.

    “They synthesized three polymers ( A34 -A36 , Fig. 6) by Stille coupling polymerization and used them as donors with PC71BM in BHJ OSCs.”

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Authors
Wang, L., Shi, S., Ma, D., Chen, S., Gao, C., Wang, M., Shi, K., Li, Y., Li, X., & Wang, H.
Affiliations
  • Beijing University of Chemical Technology (CN)
  • China Textile Academy (CN)
  • Chinese Academy of Sciences (CN)
Corresponding author
  • Li, Yongfang
  • Li, Xiaoyu
  • Wang, Haiqiao
Venue
Macromolecules
Published
2014-12-19
Volume
48
Issue
1
Pages
287-296
ISSN
  • 0024-9297 (ISSN-L)
  • 1520-5835
OpenAlex
W1989160385
Cited by
39
References
39
Citations by year
2021: 1 · 2020: 2 · 2019: 3 · 2018: 7 · 2017: 10 · 2016: 9 · 2015: 7
FWCI
4.60
Type
journal article
Language
en
Open access
closed
Locations
Macromolecules (publishedVersion)
Funders
  • Ministry of Education of the People's Republic of China (20130010110006)
  • Natural Science Foundation of Beijing Municipality (2122047)
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Electronics and Photovoltaics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Light-Emitting Diodes Research
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Photodynamic Therapy Research Studies
Keywords
donor-acceptor polymers, diketopyrrolopyrrole, oligothiophenes, polymer solar cells, short-wavelength absorption, Stille coupling polymerization, power conversion efficiency, short-circuit current density

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