Improved photovoltaic performance and robustness of all-polymer solar cells enabled by a polyfullerene guest acceptor

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: April 22, 2023

Abstract Fullerene acceptors typically possess excellent electron-transporting properties and can work as guest components in ternary organic solar cells to enhance the charge extraction efficiencies. However, conventional fullerene small molecules suffer from undesirable segregation dimerization, thus limiting their applications cells. Herein we report use of a poly(fullerene- alt -xylene) acceptor (PFBO-C12) component enables significant efficiency increase 16.9% for binary 18.0% all-polymer Ultrafast optic optoelectronic studies unveil that PFBO-C12 facilitate hole transfer suppress recombination. Morphological investigations show blends maintain favorable morphology with high crystallinity smaller domain size. Meanwhile, introduction reduces voltage loss light stability mechanical durability flexible devices. This demonstrates introducing polyfullerenes is an effective approach achieving highly efficient good robustness.

Language: Английский

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The effect of alkyl substitution position of thienyl outer side chains on photovoltaic performance of A–DA′D–A type acceptors

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(5), P. 2011 - 2020

Published: Jan. 1, 2022

Two isomeric A–DA′D–A type SMAs o -TEH and m were designed synthesized, the PCE of OSC based on PBQ6: reached 18.51%.

Language: Английский

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Solid additive engineering enables high-efficiency and eco-friendly all-polymer solar cells

Matter, Journal Year: 2022, Volume and Issue: 5(11), P. 4047 - 4059

Published: Aug. 24, 2022

Language: Английский

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Geometry design of tethered small-molecule acceptor enables highly stable and efficient polymer solar cells

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: May 22, 2023

With the power conversion efficiency of binary polymer solar cells dramatically improved, thermal stability small-molecule acceptors raised main concerns on device operating stability. Here, to address this issue, thiophene-dicarboxylate spacer tethered are designed, and their molecular geometries further regulated via thiophene-core isomerism engineering, affording dimeric TDY-α with a 2, 5-substitution TDY-β 3, 4-substitution core. It shows that processes higher glass transition temperature, better crystallinity relative its individual acceptor segment isomeric counterpart TDY-β, more stable morphology donor. As result, based delivers 18.1%, most important, achieves an extrapolated lifetime about 35000 hours retaining 80% initial efficiency. Our result suggests proper geometry design, can achieve both high

Language: Английский

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High‐Efficiency and Mechanically Robust All‐Polymer Organic Photovoltaic Cells Enabled by Optimized Fibril Network Morphology

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(9)

Published: Dec. 20, 2022

All-polymer organic photovoltaic (OPV) cells possessing high performance and mechanical robustness are promising candidates for flexible wearable devices. However, developing photoactive materials with good properties so far remains challenging. In this work, a polymer donor PBDB-TF weight-average molecular weight (Mw ) is introduced to enable highly efficient all-polymer OPV featuring excellent reliability. By incorporating the high-Mw as third component into PBQx-TF:PY-IT blend, bulk heterojunction morphology finely tuned more compact π-π stacking distance, affording pathways charge transport well stress dissipation. Hence, based on ternary blend film demonstrate maximum power conversion efficiency (PCE) of 18.2% an outstanding fill factor 0.796. The cell delivers decent PCE 16.5% stability. These results present strategy address boost cells.

Language: Английский

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16.52% Efficiency All‐Polymer Solar Cells with High Tolerance of the Photoactive Layer Thickness

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(20)

Published: March 15, 2022

All-polymer solar cells (all-PSCs) have drawn growing attention and achieved tremendous progress recently, but their power conversion efficiency (PCE) still lags behind small-molecule-acceptor (SMA)-based PSCs due to the relative difficulty on morphology control of polymer photoactive blends. Here, low-cost PTQ10 is introduced as a second donor (a third component) into PM6:PY-IT blend finely tune energy-level matching microscopic layer. The addition decreases π-π stacking distance, increases coherence length ordered face-on molecular packing orientation, which improves charge separation transport in Moreover, deeper highest occupied orbital energy level than PM6 leads higher open-circuit voltage ternary all-PSCs. As result, PCE 16.52% for all-PSCs, one PCEs In addition, devices exhibit high tolerance layer thickness with 15.27% 13.91% at ≈205 ≈306 nm, respectively, are so far all-PSCs thick

Language: Английский

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High performance polymerized small molecule acceptor by synergistic optimization on π-bridge linker and side chain

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Sept. 7, 2022

The polymerized small-molecule acceptors have attracted great attention for application as polymer acceptor in all-polymer solar cells recently. modification of small molecule building block and the π-bridge linker is an effective strategy to improve photovoltaic performance acceptors. In this work, we synthesized a new PG-IT2F which representative PY-IT by replacing its upper linear alkyl side chains on with branched attaching difluorene substituents thiophene linker. Through synergistic optimization, possesses more suitable phase separation, increased charge transportation, better exciton dissociation, lower bimolecular recombination, longer transfer state lifetime than their PM6 donor. Therefore, devices based PM6:PG-IT2F demonstrated high power conversion efficiency 17.24%, one highest reported binary all date. This work indicates that regulation plays key role designing developing highly efficient

Language: Английский

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Achieving 15.81% and 15.29% efficiency of all-polymer solar cells based on layer-by-layer and bulk heterojunction structures

Journal of Materials Chemistry A, Journal Year: 2022, Volume and Issue: 10(25), P. 13492 - 13499

Published: Jan. 1, 2022

PCEs of 15.81% and 15.29% are achieved in LbL BHJ all-PSCs with polymer donor PM6, acceptor PY-IT CN as an additive. Over 15% PCE improvement can be obtained active layers.

Language: Английский

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Sequentially regular polymer acceptors featuring flexible spacers for high-performance and mechanically robust all-polymer solar cells

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(11), P. 4672 - 4685

Published: Jan. 1, 2022

We report a new molecular design of sequentially regular polymerized small-molecule-acceptors containing flexible spacer (FS) units (PYFS-Reg) to achieve all-polymer solar cells with both high-performance and mechanical stretchability.

Language: Английский

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Controlling morphology and microstructure of conjugated polymers via solution-state aggregation

Progress in Polymer Science, Journal Year: 2022, Volume and Issue: 136, P. 101626 - 101626

Published: Nov. 13, 2022

Language: Английский

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