Low-Bandgap Non-fullerene Acceptors Enabling High-Performance Organic Solar Cells

Liu, Wei; Xu, Xiang; Yuan, Jun; Leclerc, Mario; Zou, Yingping; Li, Yongfang

doi:10.1021/acsenergylett.0c02384

Cited by 199 publications

(141 citation statements)

References 81 publications

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“…Narrow‐bandgap ( E g ) organic/polymer semiconductors are critical components for the development of organic solar cells (OSCs), as exemplified by the recent fused‐ring electron acceptors (FREAs). [ 1–6 ] Combining with tailored‐made polymer donors and device engineering, these FREAs with excellent optical and electrical properties have enabled state‐of‐the‐art power conversion efficiency (PCEs) over 17% in OSCs. [ 7–11 ] Compared to the FREAs‐based OSCs, all‐polymer solar cells (all‐PSCs) based on polymers as both the electron donors and acceptors show unique merits including superior stability and mechanical robustness.…”

Section: Introductionmentioning

confidence: 99%

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

et al. 2021

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Narrow‐bandgap n‐type polymers with high electron mobility are urgently demanded for the development of all‐polymer solar cells (all‐PSCs). Here, two regioregular narrow‐bandgap polymer acceptors, L15 and MBTI, with two electron‐deficient segments are synthesized by copolymerizing two dibrominated fused‐ring electron acceptors (FREA) with distannylated aromatic imide, respectively. Taking full advantage of the FREA and the imide, both polymer acceptors show narrow bandgap and high electron mobility. Benefiting from the more extended absorption, better backbone ordering, and higher electron mobility than those of its regiorandom analog, the L15‐based all‐PSC yields a high power conversion efficiency (PCE) of 15.2% when blended with the polymer donor PM6. More importantly, MBTI incorporating a benzothiophene‐core FREA segment shows relatively higher frontier molecular orbital levels than L15, forming a cascade‐like energy level alignment with L15 and PM6. Based on this, ternary all‐PSCs are designed where MBTI is introduced as a guest into the PM6:L15 host system. Thanks to further optimal blend morphology and more balanced charge transport, the PCE is improved up to 16.2%, which is among the highest values for all‐PSCs. The results demonstrate that combining an FREA and an aromatic imide to construct regioregular narrow‐bandgap polymer acceptors provides an effective approach to fabricate highly efficient all‐PSCs.

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Section: Introductionmentioning

confidence: 99%

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

et al. 2021

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“…A lot of efforts have proved that non‐fullerene acceptors have more potential to achieve higher photovoltaic performance. [ 106,5,186–189 ] Thereinto, furan is frequently used as a π‐spacer in the backbone of non‐fullerene acceptors. For example, Zhan et al.…”

Section: Furan For Osc Applicationsmentioning

confidence: 99%

Recent Advances of Furan and Its Derivatives Based Semiconductor Materials for Organic Photovoltaics

Zheng

Huo

2021

Small Methods

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The state‐of‐the‐art bulk‐heterojunction (BHJ)‐type organic solar cells (OSCs) have exhibited power conversion efficiencies (PCEs) of exceeding 18%. Thereinto, thiophene and its fused‐ring derivatives play significant roles in facilitating the development of OSCs due to their excellent semiconducting natures. Furan as thiophene analogue, is a ubiquitous motif in naturally occurring organic compounds. Driven by the advantages of furan, such as less steric hindrance, good solubility, excellent stacking, strong rigidity and fluorescence, biomass derived fractions, more and more research groups focus on the furan‐based materials for using in OSCs in the past decade. To systematically understand the developments of furan‐based photovoltaic materials, the relationships between the molecular structures, optoelectronic properties, and photovoltaic performances for the furan‐based semiconductor materials including single furan, benzofuran, benzodifuran (BDF) (containing thienobenzofuran (TBF)), naphthodifurans (NDF), and polycyclic furan are summarized. Finally, the empirical regularities and perspectives of the development of this kind of new organic semiconductor materials are extracted.

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“…Organic solar cells (OSCs) based on non‐fullerene acceptors (NFAs) have drawn significant attentions due to their distinct advantages such as broad and strong absorption spectra, adjustable energy levels and good morphology stability. [ 1‐8 ] To date, the power conversion efficiencies (PCEs) of NFAs based OSCs have reached over 17%, [ 9‐17 ] and the highest V oc has realized beyond 1.1 V for single junction devices. [ 18‐21 ] Recently, great efforts have been devoted to designing and synthesizing high‐performance NFAs with A‐D‐A structure, which usually include a co‐planar fused‐ring central unit (D) and two strong electron‐withdrawing end‐capped units (A).…”

Section: Background and Originality Contentmentioning

confidence: 99%

A Noncovalently Fused‐Ring Asymmetric Electron Acceptor Enables Efficient Organic Solar Cells

et al. 2021

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Main observation and conclusion Recently, the asymmetric nonfullerene acceptors (NFAs) with acceptor‐donor‐acceptor (A‐D‐A) structure have been developed rapidly, especially for the modification of asymmetric core, asymmetric side chains and asymmetric end groups. In this work, a novel asymmetric A‐D‐π‐A type NFA with a noncovalently fused‐ring core named PIST‐4F is synthesized, containing an indacenodithieno[3,2‐b]dithiophene (IDT), two strong electron‐withdrawing end groups and an alkylthio‐substituted thiophene π‐bridge. Benefiting from the S···S noncovalent interaction between the sulfur atom on π‐bridge and the adjacent thiophene in IDT, the PIST‐4F presents nearly planar geometry and extended conjugated area, resulting in the optimized electronic properties, charge transport, and film morphology compared to the symmetric NFA PI‐4F. As a result, PM6:PIST‐4F‐based devices achieve a higher power conversion efficiency (PCE) of 13.8%, while the PM6:PI‐4F‐based devices only show a PCE of 7.1%. Notably, the PM6:PIST‐4F‐based devices processed with nonhalogen solvent toluene exhibit an excellent PCE as high as 13.1%. These results indicate that PIST‐4F is an effective acceptor for high‐efficiency organic solar cells.

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Low-Bandgap Non-fullerene Acceptors Enabling High-Performance Organic Solar Cells

Cited by 199 publications

References 81 publications

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

Regioregular Narrow‐Bandgap n‐Type Polymers with High Electron Mobility Enabling Highly Efficient All‐Polymer Solar Cells

Recent Advances of Furan and Its Derivatives Based Semiconductor Materials for Organic Photovoltaics

A Noncovalently Fused‐Ring Asymmetric Electron Acceptor Enables Efficient Organic Solar Cells

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