WFRF:(Yuan Bao Zhu)
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Low-bandgap polymers with quinoid unit as π bridge for high-performance solar cells
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- Shahid, Bilal (author)
- Chinese Academy of Sciences
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- Yuan, Xiyue (author)
- Chinese Academy of Sciences
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- Wang, Qian (author)
- Chinese Academy of Sciences
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- (creator_code:org_t)
- Elsevier BV, 2020
- 2020
- English.
- In: Journal of Energy Chemistry. - : Elsevier BV. - 2095-4956. ; 40:2020, s. 180-187
- Journal article (peer-reviewed)
Abstract
Subject headings
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- To construct efficient low band gap polymers, increasing the Quinone structure of the polymer backbone could be one desirable strategy. In this work, two D–Q–A–Q polymers P1 and P2 were designed and synthesized with thiophenopyrrole diketone (TPD) and benzothiadiazole (BT) unit as the core and ester linked thieno[3,4-b]thiophene (TT) segment as π-bridging, and the main focus is to make a comparative analysis of different cores in the influence of the optical, electrochemical, photochemical and morphological properties. Compared with the reported PBDTT EH –TBTT HD−i , P1 exhibited the decreased HOMO energy level of −5.38 eV and lower bandgap of 1.48 eV. Furthermore, when replaced with BT core, P2 showed a red-shifted absorption profile of polymer but with up-shifted HOMO energy level. When fabricated the photovoltaic devices in conventional structure, just as expected, the introduction of ester substituent made an obvious increase of V OC from 0.63 to 0.74 V for P1. Besides, due to the deep HOMO energy level, higher hole mobility and excellent phase separation with PC 71 BM, a superior photovoltaic performance (PCE = 7.13%) was obtained with a short-circuit current density (J SC ) of 14.9 mA/cm 2 , significantly higher than that of P2 (PCE = 2.23%). Generally, this study highlights that the strategy of inserting quinoid moieties into D–A polymers could be optional in LBG-polymers design and presents the importance and comparison of potentially competent core groups.
Subject headings
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Quinone structure
- Low bandgap polymer
- π-bridging
- Side-chain engineering
Publication and Content Type
- art (subject category)
- ref (subject category)
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- Shahid, Bilal
- Yuan, Xiyue
- Wang, Qian
- Zhou, Di
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- Zhu, D. Q.
- Yang, R.
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- Chalmers University of Technology
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