A General Approach toward Electron Deficient Triazole Units to Construct Conjugated Polymers for Solar Cells

Li, Wentao; Yan, Liang; Zhou, Hui; You, Wei

doi:10.1021/acs.chemmater.5b03098

Cited by 71 publications

(64 citation statements)

References 29 publications

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“…When they were blended with PC 61 BM, P109‐P111 exhibited a noticeably high V oc of approximately 1 V due to the deep HOMO levels. P111 presented the best PCE of 8.4% with an active layer thickness of approximately 300 nm . The 4‐alkyl‐3,5‐difluorophenyl group was first introduced as the lateral side chain to modify the benzodithiophene unit (FBDT).…”

Section: Wbg Copolymersmentioning

confidence: 99%

Recent Advances in Wide‐Bandgap Photovoltaic Polymers

2017

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The past decade has witnessed significant advances in the field of organic solar cells (OSCs). Ongoing improvements in the power conversion efficiency of OSCs have been achieved, which were mainly attributed to the design and synthesis of novel conjugated polymers with different architectures and functional moieties. Among various conjugated polymers, the development of wide-bandgap (WBG) polymers has received less attention than that of low-bandgap and medium-bandgap polymers. Here, we briefly summarize recent advances in WBG polymers and their applications in organic photovoltaic (PV) devices, such as tandem, ternary, and non-fullerene solar cells. Addtionally, we also dissuss the application of high open-circuit voltage tandem solar cells in PV-driven electrochemical water dissociation. We mainly focus on the molecular design strategies, the structure-property correlations, and the photovoltaic performance of these WBG polymers. Finally, we extract empirical regularities and provide invigorating perspectives on the future development of WBG photovoltaic materials.

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Section: Wbg Copolymersmentioning

confidence: 99%

Recent Advances in Wide‐Bandgap Photovoltaic Polymers

2017

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Section: Molecular Engineering (Backbone Substituents and Side Chains)mentioning

confidence: 99%

Molecular Engineering of Conjugated Polymers for Solar Cells: An Updated Report

2016

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The device efficiency of polymer:fullerene bulk heterojunction solar cells has recently surpassed 11%, as a result of synergistic efforts among chemists, physicists, and engineers. Since polymers are unequivocally the "heart" of this emerging technology, their design and synthesis have consistently played the key role in the device efficiency enhancement. In this article, the first focus is a discussion on molecular engineering (e.g., backbone, side chains, and substituents), then the discussion moves on to polymer engineering (e.g., molecular weight). Examples are primarily selected from the authors contributions; yet other significant discoveries/developments are also included to put the discussion in a broader context. Given that the synthesis, morphology, and device physics are inherently related in explaining the measured device output parameters (J , V and FF), we will attempt to apply an integrated and comprehensive approach (synthesis, morphology, and device physics) to elucidate the fundamental, underlying principles that govern the device characteristics, in particular, in the context of disclosing structure-property correlations. Such correlations are crucial to the design and synthesis of next generation materials to further improve the device efficiency.

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“…Therefore, in order to make a breakthrough both in J sc and FF to further improve the device performance of FTAZ‐based copolymers, the effect of side‐chain engineering on the device performance should be investigated and the branched alkyl substituent of FTAZ needs the rational design. In addition, side‐chain engineering has been verified to remarkably enhance the J sc and FF by fine‐tuning the morphological properties of the active layer . However, it was barely reported in the significant improvement of V oc .…”

Section: Introductionmentioning

confidence: 99%

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

Liao

Xie

Chen

et al. 2019

Adv Funct Materials

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The fluorobenzotriazole (FTAZ)‐based copolymer donors are promising candidates for nonfullerene polymer solar cells (PSCs), but suffer from relatively low photovoltaic performance due to their unsuitable energy levels and unfavorable morphology. Herein, three polymer donors, L24, L68, and L810, based on a chlorinated‐thienyl benzodithiophene (BDT‐2Cl) unit and FTAZ with different branched alkyl side chain, are synthesized. Incorporation of a chlorine (Cl) atom into the BDT unit is found to distinctly optimize the molecular planarity, energy levels, and improve the polymerization activity. Impressively, subtle side chain length of FTAZ realizes a dramatic improvement in all the device parameters, as revealed by the short‐current density (Jsc) improved from 7.41 to 20.76 mA cm−2, fill‐factor from 36.3 to 73.5%, and even the open‐circuit voltage (Voc) from 0.495 to 0.790 V. The best power conversion efficiency (PCE) of 12.1% is obtained from the L810‐based device, which is one of the highest values reported for FTAZ‐based PSCs so far. Notably, the corresponding external quantum efficiency curve keeps a very prominent value up to 80% from 500 to 800 nm. The notable performance is discovered from the reduced energy loss, improved molecular face‐on orientation, the down‐shifted energy levels, and optimized absorption coefficient regulated by side‐chain engineering.

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A General Approach toward Electron Deficient Triazole Units to Construct Conjugated Polymers for Solar Cells

Cited by 71 publications

References 29 publications

Recent Advances in Wide‐Bandgap Photovoltaic Polymers

Recent Advances in Wide‐Bandgap Photovoltaic Polymers

Molecular Engineering of Conjugated Polymers for Solar Cells: An Updated Report

Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency

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