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Bulky side-chain density effect on the photophysical, electrochemical and photovoltaic properties of polythiophene derivatives

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Title: Bulky side-chain density effect on the photophysical, electrochemical and photovoltaic properties of polythiophene derivatives
Authors: Wang, Hsing-Ju1, Chan, Li-Hsin2 lhchan@ncnu.edu.tw, Chen, Chih-Ping3, Lin, Shin-Lei3, Lee, Rong-Ho1, Jeng, Ru-Jong1 rjjeng@nchu.edu.tw
Source: Polymer. Jan2011, Vol. 52 Issue 2, p326-338. 13p.
Subjects: Electrochemistry, Photovoltaic power generation, Polythiophenes, Energy bands, Conjugated polymers, Thiophenes, Solar cells, Addition reactions
Abstract: Abstract: Low band-gap polythiophene (PT) derivatives, with bulky conjugated side-chains composed of the triphenylamine, thiophene, and vinylene groups (TPATh), are synthesized. The copolymers, synthesized by Grignard metathesis and Stille coupling with different copolymer configurations and side-chain densities, are regioregular-TPATh-PT (rr-TPATh-PT) and random-TPATh-PT (r-TPATh-PT), respectively. The incorporation of bulky conjugated moiety curtails the effective conjugation length in the main chain; thus, low HOMO levels are obtained for the copolymers. Moreover, r-TPATh-PT with less bulky side-chain content exhibits a better conjugation along the polymer backbone than rr-TPATh-PT. Higher absorption intensity in the vision region is observed for r-TPATh-PT in comparison with rr-TPATh-PT. In addition, polymer solar cells (PSCs) are fabricated based on an interpenetrating network of PT derivatives as the electron donor and the fullerene derivatives (PC61BM and PC71BM) as the electron acceptors. Better compatibility is observed for the r-TPATh-PT/PC61BM-blend film as compared to the rr-TPATh-PT/PC61BM-blend film. Higher photovoltaic (PV) performances of the r-TPATh-PT/PC61BM-based PSCs are observed in comparison with the rr-TPATh-PT/PC61BM-based PSCs. The power conversion efficiency (PCE) of the PSC based on the blend of r-TPATh-PT and PC61BM (w/w = 1:1) reaches 0.94% under an illumination of AM 1.5G, 100 mW cm−2, which is almost twice that of the cell based on rr-TPATh-PT. Further improvement of PV performance is achieved for the PSC fabricated from the blend of r-TPATh-PT and fullerene derivative PC71BM (w/w = 1:3), with a short-circuit current of 6.83 mA cm−2, an open-circuit voltage of 0.71 V and a PCE of 1.75%. [ABSTRACT FROM AUTHOR]
Copyright of Polymer is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Bulky side-chain density effect on the photophysical, electrochemical and photovoltaic properties of polythiophene derivatives
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  Data: <searchLink fieldCode="JN" term="%22Polymer%22">Polymer</searchLink>. Jan2011, Vol. 52 Issue 2, p326-338. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Electrochemistry%22">Electrochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Photovoltaic+power+generation%22">Photovoltaic power generation</searchLink><br /><searchLink fieldCode="DE" term="%22Polythiophenes%22">Polythiophenes</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+bands%22">Energy bands</searchLink><br /><searchLink fieldCode="DE" term="%22Conjugated+polymers%22">Conjugated polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Thiophenes%22">Thiophenes</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+cells%22">Solar cells</searchLink><br /><searchLink fieldCode="DE" term="%22Addition+reactions%22">Addition reactions</searchLink>
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  Data: Abstract: Low band-gap polythiophene (PT) derivatives, with bulky conjugated side-chains composed of the triphenylamine, thiophene, and vinylene groups (TPATh), are synthesized. The copolymers, synthesized by Grignard metathesis and Stille coupling with different copolymer configurations and side-chain densities, are regioregular-TPATh-PT (rr-TPATh-PT) and random-TPATh-PT (r-TPATh-PT), respectively. The incorporation of bulky conjugated moiety curtails the effective conjugation length in the main chain; thus, low HOMO levels are obtained for the copolymers. Moreover, r-TPATh-PT with less bulky side-chain content exhibits a better conjugation along the polymer backbone than rr-TPATh-PT. Higher absorption intensity in the vision region is observed for r-TPATh-PT in comparison with rr-TPATh-PT. In addition, polymer solar cells (PSCs) are fabricated based on an interpenetrating network of PT derivatives as the electron donor and the fullerene derivatives (PC61BM and PC71BM) as the electron acceptors. Better compatibility is observed for the r-TPATh-PT/PC61BM-blend film as compared to the rr-TPATh-PT/PC61BM-blend film. Higher photovoltaic (PV) performances of the r-TPATh-PT/PC61BM-based PSCs are observed in comparison with the rr-TPATh-PT/PC61BM-based PSCs. The power conversion efficiency (PCE) of the PSC based on the blend of r-TPATh-PT and PC61BM (w/w = 1:1) reaches 0.94% under an illumination of AM 1.5G, 100 mW cm−2, which is almost twice that of the cell based on rr-TPATh-PT. Further improvement of PV performance is achieved for the PSC fabricated from the blend of r-TPATh-PT and fullerene derivative PC71BM (w/w = 1:3), with a short-circuit current of 6.83 mA cm−2, an open-circuit voltage of 0.71 V and a PCE of 1.75%. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Polymer is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.polymer.2010.11.036
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 326
    Subjects:
      – SubjectFull: Electrochemistry
        Type: general
      – SubjectFull: Photovoltaic power generation
        Type: general
      – SubjectFull: Polythiophenes
        Type: general
      – SubjectFull: Energy bands
        Type: general
      – SubjectFull: Conjugated polymers
        Type: general
      – SubjectFull: Thiophenes
        Type: general
      – SubjectFull: Solar cells
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      – SubjectFull: Addition reactions
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    Titles:
      – TitleFull: Bulky side-chain density effect on the photophysical, electrochemical and photovoltaic properties of polythiophene derivatives
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            NameFull: Wang, Hsing-Ju
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            NameFull: Chan, Li-Hsin
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            NameFull: Chen, Chih-Ping
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            NameFull: Lin, Shin-Lei
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            NameFull: Lee, Rong-Ho
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              M: 01
              Text: Jan2011
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              Y: 2011
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