Single-junction organic solar cells with over 19% efficiency enabled by a refined double-fibril network morphology

Nature Materials, Год журнала: 2022, Номер 21(6), С. 656 - 663

Опубликована: Май 5, 2022

Язык: Английский

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Non-fullerene acceptors with branched side chains and improved molecular packing to exceed 18% efficiency in organic solar cells

Nature Energy, Год журнала: 2021, Номер 6(6), С. 605 - 613

Опубликована: Май 10, 2021

Язык: Английский

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Single‐Junction Organic Photovoltaic Cell with 19% Efficiency

Advanced Materials, Год журнала: 2021, Номер 33(41)

Опубликована: Авг. 31, 2021

Abstract Improving power conversion efficiency (PCE) is important for broadening the applications of organic photovoltaic (OPV) cells. Here, a maximum PCE 19.0% (certified value 18.7%) achieved in single‐junction OPV cells by combining material design with ternary blending strategy. An active layer comprising new wide‐bandgap polymer donor named PBQx‐TF and low‐bandgap non‐fullerene acceptor (NFA) eC9‐2Cl rationally designed. With optimized light utilization, resulting binary cell exhibits good 17.7%. NFA F‐BTA3 then added to as third component simultaneously improve parameters. The improved unitization, cascaded energy level alignment, enhanced intermolecular packing result open‐circuit voltage 0.879 V, short‐circuit current density 26.7 mA cm −2 , fill factor 0.809. This study demonstrates that further improvement PCEs high‐performance requires fine tuning electronic structures morphologies layers.

Язык: Английский

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Renewed Prospects for Organic Photovoltaics

Chemical Reviews, Год журнала: 2022, Номер 122(18), С. 14180 - 14274

Опубликована: Авг. 5, 2022

Organic photovoltaics (OPVs) have progressed steadily through three stages of photoactive materials development: (i) use poly(3-hexylthiophene) and fullerene-based acceptors (FAs) for optimizing bulk heterojunctions; (ii) development new donors to better match with FAs; (iii) non-fullerene (NFAs). The application NFAs an A–D–A configuration (where A = acceptor D donor) has enabled devices efficient charge generation small energy losses (Eloss < 0.6 eV), resulting in substantially higher power conversion efficiencies (PCEs) than FA-based devices. discovery Y6-type (Y6 2,2′-((2Z,2′Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]-thiadiazolo[3,4-e]-thieno[2″,3″:4′,5′]thieno-[2′,3′:4,5]pyrrolo-[3,2-g]thieno-[2′,3′:4,5]thieno-[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile) A–DA′ D–A further propelled the PCEs go beyond 15% due smaller Eloss values (∼0.5 eV) external quantum efficiencies. Subsequently, Y6-series single-junction increased >19% may soon approach 20%. This review provides update recent progress OPV following aspects: developments novel donors, understanding structure–property relationships underlying mechanisms state-of-the-art OPVs, tasks underpinning commercialization such as device stability, module development, potential applications, high-throughput manufacturing. Finally, outlook prospects section summarizes remaining challenges technology.

Язык: Английский

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Single-layered organic photovoltaics with double cascading charge transport pathways: 18% efficiencies

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Янв. 12, 2021

Abstract The chemical structure of donors and acceptors limit the power conversion efficiencies achievable with active layers binary donor-acceptor mixtures. Here, using quaternary blends, double cascading energy level alignment in bulk heterojunction organic photovoltaic are realized, enabling efficient carrier splitting transport. Numerous avenues to optimize light absorption, transport, charge-transfer state levels opened by constitution components. Record-breaking PCEs 18.07% achieved where, electronic morphology optimization, simultaneous improvements open-circuit voltage, short-circuit current fill factor occur. donor acceptor structures afford control over levels, manipulation hole-transfer rates, non-radiative recombination losses.

Язык: Английский

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Delocalization of exciton and electron wavefunction in non-fullerene acceptor molecules enables efficient organic solar cells

Nature Communications, Год журнала: 2020, Номер 11(1)

Опубликована: Авг. 7, 2020

Abstract A major challenge for organic solar cell (OSC) research is how to minimize the tradeoff between voltage loss and charge generation. In early 2019, we reported a non-fullerene acceptor (named Y6) that can simultaneously achieve high external quantum efficiency low OSC. Here, use combination of experimental theoretical modeling reveal structure-property-performance relationships this state-of-the-art OSC system. We find distinctive π–π molecular packing Y6 not only exists in single crystals but also thin films. Importantly, such leads (i) formation delocalized emissive excitons enable small non-radiative loss, (ii) delocalization electron wavefunctions at donor/acceptor interfaces significantly reduces Coulomb attraction interfacial electron-hole pairs. These properties are critical enabling highly efficient generation systems with negligible donor-acceptor energy offset.

Язык: Английский

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New Phase for Organic Solar Cell Research: Emergence of Y-Series Electron Acceptors and Their Perspectives

ACS Energy Letters, Год журнала: 2020, Номер 5(5), С. 1554 - 1567

Опубликована: Апрель 7, 2020

With the recent emergence of a new class high-performance nonfullerene acceptors (NFAs), organic solar cells (OSCs) have entered phase research featuring high power conversion efficiencies (PCEs). In this Perspective, we summarize progress made from Y-series NFAs and matched polymer donors analyze molecular design strategies for boosting device performance. We also perform PCE prediction OSCs propose requirements NFAs, aiming at 20%, which is comparable to those Si perovskite-based counterparts. Finally, assess three factors efficiency, stability, cost outline challenges facing future development directions OSCs. This work expected provide valuable suggestions with comprehensive view advance practical application

Язык: Английский

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A History and Perspective of Non‐Fullerene Electron Acceptors for Organic Solar Cells

Advanced Energy Materials, Год журнала: 2021, Номер 11(15)

Опубликована: Янв. 14, 2021

Abstract Organic solar cells are composed of electron donating and accepting organic semiconductors. Whilst a significant palette donors has been developed over three decades, until recently only small number acceptors have proven capable delivering high power conversion efficiencies. In particular the fullerenes dominated landscape. this perspective, emergence family materials–the non‐fullerene (NFAs) is described. These delivered discontinuous advance in cell efficiencies, with milestone 20% now sight. Intensive international efforts synthetic chemistry established clear design rules for molecular engineering enabling an ever‐expanding efficiency candidates. However, these materials challenge accepted wisdom how work force new thinking areas such as morphology, charge generation recombination. This perspective provides historical context development NFAs, also addresses current plus considers important manufacturability criteria. There no doubt that NFAs propelled technology to efficiencies necessary viable commercial technology–but far can they be pushed, will deliver on equally metrics stability?

Язык: Английский

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Charge Separation from an Intra-Moiety Intermediate State in the High-Performance PM6:Y6 Organic Photovoltaic Blend

Journal of the American Chemical Society, Год журнала: 2020, Номер 142(29), С. 12751 - 12759

Опубликована: Июнь 30, 2020

Bulk-heterojunction organic photovoltaic devices with nonfullerene acceptors (NFAs) exhibit efficient hole transfer small interfacial energy offset, which results in power conversion efficiencies above 17% single junction using the high-performance NFA of Y6. However, underlying mechanism responsible for channel polymer/Y6 blends remains poorly understood. Herein, we report that photocharge generation is mediated by an intra-moiety excited state a blend donor polymer PM6 and Y6 broadband transient absorption (TA) spectroscopy. By comparing TA data recorded from solution film samples, identify ultrafast formation excimer together primary local excitation on time scale ∼0.2 ps film. The acts as intermediate channel, dissociates into free polarons ∼15 PM6/Y6 at room temperature. state, arising intermolecular coupling domains, markedly different charge commonly accepted electron channel. These findings suggest manipulating interplay between species can provide promising route further improving device performance.

Язык: Английский

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A guest-assisted molecular-organization approach for >17% efficiency organic solar cells using environmentally friendly solvents

Nature Energy, Год журнала: 2021, Номер 6(11), С. 1045 - 1053

Опубликована: Ноя. 1, 2021

Язык: Английский

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