Manipulating Charge Transfer and Transport via Intermediary Electron Acceptor Channels Enables 19.3% Efficiency Organic Photovoltaics

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(39)

Published: Aug. 21, 2022

Abstract Balancing and improving the open‐circuit voltage ( V oc ) short‐circuit current density J sc synergistically has always been critical point for organic photovoltaics (OPVs) to achieve high efficiencies. Here, this work adopts a ternary strategy regulate trade‐off between by combining symmetric‐asymmetric non‐fullerene acceptors that differ at terminals alkyl side chains build OPV (TOPV). It is noticed reduced energy disorder enhanced luminescence efficiency of TOPV enable mitigated loss higher . Meanwhile, third component, which distributed host donor–acceptor interface, acts as charge transport channel. The prolonged exciton lifetime, boosted mobility, depressed recombination promote obtain an improved Finally, with , delivers optimal 19.26% (certified 19.12%), representing one highest values reported so far.

Language: Английский

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

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(37)

Published: Aug. 2, 2021

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

Language: Английский

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High fill factor organic solar cells with increased dielectric constant and molecular packing density

Joule, Journal Year: 2022, Volume and Issue: 6(2), P. 444 - 457

Published: Feb. 1, 2022

Language: Английский

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18.5% Efficiency Organic Solar Cells with a Hybrid Planar/Bulk Heterojunction

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(43)

Published: Sept. 12, 2021

The donor:acceptor heterojunction has proved as the most successful approach to split strongly bound excitons in organic solar cells (OSCs). Establishing an ideal architecture with selective carrier transport and suppressed recombination is of great importance improve photovoltaic efficiency while remains a challenge. Herein, via tailoring hybrid planar/bulk structure, highly efficient OSCs reduced energy losses (Eloss s) are fabricated. A p-type benzodithiophene-thiophene alternating polymer n-type naphthalene imide inserted on both sides mixed active layer construct heterojunction, respectively. tailored structure donor near anode acceptor cathode beneficial for obtaining enhanced charge transport, extraction, recombination. As result, characterizations suggest nonradiative Eloss by 25 meV, best OSC records high 18.5% (certified 18.2%). This study highlights that precisely regulating potential further efficiencies OSCs.

Language: Английский

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19.10% Efficiency and 80.5% Fill Factor Layer‐by‐Layer Organic Solar Cells Realized by 4‐Bis(2‐Thienyl)Pyrrole‐2,5‐Dione Based Polymer Additives for Inducing Vertical Segregation Morphology

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(6)

Published: Nov. 22, 2022

The morphology plays a key role in determining the charge generation and collection process, thus impacting performances of organic solar cells (OSCs). limited selection pool additives to optimize OSCs, especially for emerging layer-by-layer (LbL) impeding improvements photovoltaic performances. Herein, new method using conjugated polymers as improving LbL-OSCs is reported. Four PH, PS, PF, PCl are developed with different side chains. These exhibit poor donor materials BHJ devices, due unsuitable energy level alignment unfavorable molecular interactions. By contrast, they can be served efficient PM6 fibril matrix facilitating penetration BTP-eC9 forming an intertwined D/A bicontinuous network vertical segregation. Such optimized by chain engineering, which enables progressive improvement separation collection. As result, adding small amount additive, contributes champion PCE 19.10% high FF 80.5%.

Language: Английский

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