Non‐Radiative Recombination Energy Losses in Non‐Fullerene Organic Solar Cells

Advanced Functional Materials, Год журнала: 2022, Номер 32(19)

Опубликована: Фев. 5, 2022

Abstract Impressive short‐circuit current density and fill factor have been achieved simultaneously in single‐junction organic solar cells (OSCs) with the emergence of high‐performance non‐fullerene acceptors. However, power conversion efficiencies (PCEs) OSCs still lag behind those inorganic perovskite cells, mainly due to modest open‐circuit voltage ( V OC ) imposed by relatively large energy loss E ). Generally, can be divided into three parts. Among them, Δ 1 is inevitable for all photovoltaic depends on optical bandgap while radiative recombination loss, 2 , approach negligible value via finely matching donor acceptor material blend. The non‐radiative 3 becomes main barrier further reduce thus enhance PCE acceptor‐based OSCs. In this review, recent studies achievements about summarized from aspects design, morphology manipulation, ternary strategy, mechanism, theoretical study. It hoped that review helps get a deep understanding boost advance study

Язык: Английский

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Regioisomer‐Free Difluoro‐Monochloro Terminal‐based Hexa‐Halogenated Acceptor with Optimized Crystal Packing for Efficient Binary Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(46)

Опубликована: Сен. 2, 2022

Herein, we synthesized new hetero-halogenated end groups with well-determined fluorinated and chlorinated substitutions (o-FCl-IC FClF-IC), regioisomer-free small molecular acceptors (SMAs) Y-Cl, Y-FCl, Y-FClF distinct terminals, respectively. The single-crystal structures theoretical calculations indicate that exhibits more compact three-dimensional network packing significant π-π electronic coupling compared to Y-FCl. From Y-Cl Y-FCl Y-FClF, the neat films exhibit a narrower optical band gap gradually enhanced electron mobility crystallinity. PM6 : blend film strongest crystallinity preferential face-on packing, desirable fibrous morphology suitable phase segregation, highest balanced charge mobilities among three films. Overall, organic solar cells (OSCs) deliver remarkable efficiency of 17.65 %, outperforming which is best PCE for reported hetero-halogens-based SMAs in binary OSCs. Our results demonstrate difluoro-monochloro hetero-terminal superior regio-regular unit enhancing intermolecular crystal photovoltaic performance SMAs.

Язык: Английский

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Unraveling Urbach Tail Effects in High-Performance Organic Photovoltaics: Dynamic vs Static Disorder

ACS Energy Letters, Год журнала: 2022, Номер 7(6), С. 1971 - 1979

Опубликована: Май 16, 2022

The origin of Urbach energy (EU) in organic semiconductors and its effect on photovoltaic properties remain a topic intense interest. In this letter, we demonstrate quantitative information the EU value emerging Y-series molecules by an in-depth analysis line shape temperature-dependent quantum efficiency spectra. We found that static disorder (EU(0)), which is dominated conformational uniformity acceptors, contributes 10–25 meV to total energy. Particularly, contribution solar cells (OSCs) much higher than those (EU(0) ≈ 3–6 meV) inorganic/hybrid counterparts, such as CH3NH3PbI3 perovskite, crystalline silicon (c-Si), gallium nitride (GaN), indium phosphide (InP), arsenide (GaAs). More importantly, establish clear correlations between performance open-circuit voltage loss. These results suggest suppressing via rational molecular design clearly path for achieving performance.

Язык: Английский

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Recent Developments of Polymer Solar Cells with Photovoltaic Performance over 17%

Advanced Functional Materials, Год журнала: 2023, Номер 33(14)

Опубликована: Янв. 22, 2023

Abstract With the emergence of ADA'DA‐type (Y‐series) non‐fullerene acceptors (NFAs), power conversion efficiencies (PCEs) organic photovoltaic devices have been constantly refreshed and gradually reached 20% in recent years (19% for single junction tandem device). The possess specific design concept, which greatly enrich NFA types excellent compatibility with many donor materials. It is gratifying to note that previously underperforming materials combine these regulated shine again. Nowadays, concept modular widely used research donors, injecting new vitality into field photovoltaics. Furthermore, also promote multicomponent devices, bilayer processing solvent engineering, additive engineering. Herein, latest progresses polymer solar cells efficiency over 17% are briefly reviewed from aspects active material design, interface development, device technology. At last, opportunities challenges commercialization future discussed.

Язык: Английский

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Unidirectional Sidechain Engineering to Construct Dual‐Asymmetric Acceptors for 19.23 % Efficiency Organic Solar Cells with Low Energy Loss and Efficient Charge Transfer

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(36)

Опубликована: Июль 18, 2023

Achieving both high open-circuit voltage (Voc ) and short-circuit current density (Jsc to boost power-conversion efficiency (PCE) is a major challenge for organic solar cells (OSCs), wherein energy loss (Eloss inefficient charge transfer usually take place. Here, three new Y-series acceptors of mono-asymmetric asy-YC11 dual-asymmetric bi-asy-YC9 bi-asy-YC12 are developed. They share the same asymmetric D1 AD2 (D1 =thieno[3,2-b]thiophene D2 =selenopheno[3,2-b]thiophene) fused-core but have different unidirectional sidechain on side, allowing fine-tuned molecular properties, such as intermolecular interaction, packing pattern, crystallinity. Among binary blends, PM6 : one has better morphology with appropriate phase separation higher order than asy-YC9 bi-asy-YC11 ones. Therefore, bi-asy-YC12-based OSCs offer PCE 17.16 % Voc Jsc , due reduced Eloss efficient properties. Inspired by strong NIR-absorption, introduced into L8-BO construct ternary OSCs. Thanks broadened absorption, optimized morphology, furtherly minimized achieve champion 19.23 %, which highest efficiencies among these annealing-free devices. Our developed engineering constructing bi-asymmetric provides an approach

Язык: Английский

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On the Conformation of Dimeric Acceptors and Their Polymer Solar Cells with Efficiency over 18 %

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(45)

Опубликована: Июнь 29, 2023

The determination of molecular conformations oligomeric acceptors (OAs) and their impact on packing are crucial for understanding the photovoltaic performance resulting polymer solar cells (PSCs) but have not been well studied yet. Herein, we synthesized two dimeric acceptor materials, DIBP3F-Se DIBP3F-S, which bridged segments Y6-derivatives by selenophene thiophene, respectively. Theoretical simulation experimental 1D 2D NMR spectroscopic studies prove that both dimers exhibit O-shaped other than S- or U-shaped counter-ones. Notably, this conformation is likely governed a distinctive "conformational lock" mechanism, arising from intensified intramolecular π-π interactions among terminal groups within dimers. PSCs based deliver maximum efficiency 18.09 %, outperforming DIBP3F-S-based (16.11 %) ranking highest efficiencies OA-based PSCs. This work demonstrates facile method to obtain OA highlights potential high-performance

Язык: Английский

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Regulation of molecular orientation in organic solar cells

Chemical Engineering Journal, Год журнала: 2024, Номер 488, С. 150783 - 150783

Опубликована: Март 28, 2024

Язык: Английский

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On the role of asymmetric molecular geometry in high-performance organic solar cells

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Апрель 16, 2024

Abstract Although asymmetric molecular design has been widely demonstrated effective for organic photovoltaics (OPVs), the correlation between geometry and their optoelectronic properties is still unclear. To access this issue, we have designed synthesized several symmetric-asymmetric non-fullerene acceptors (NFAs) pairs with identical physical properties. Interestingly, found that NFAs universally exhibited increased open-circuit voltage compared to symmetric counterparts, due reduced non-radiative charge recombination. From our molecular-dynamic simulations, NFA naturally exhibits more diverse interaction patterns at donor (D):acceptor (A) interface as ones, well higher D:A interfacial charge-transfer state energy. Moreover, it observed structure can effectively suppress triplet formation. These advantages enable a best efficiency of 18.80%, which one champion results among binary OPVs. Therefore, work unambiguously demonstrates unique advantage geometry, unveils underlying mechanism, highlights manipulation an important consideration future design.

Язык: Английский

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Advances in organic solar cells: Materials, progress, challenges and amelioration for sustainable future

Sustainable Energy Technologies and Assessments, Год журнала: 2024, Номер 63, С. 103632 - 103632

Опубликована: Фев. 14, 2024

Язык: Английский

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Enabling High Efficiency of Hydrocarbon‐Solvent Processed Organic Solar Cells through Balanced Charge Generation and Non‐Radiative Loss

Advanced Energy Materials, Год журнала: 2021, Номер 11(41)

Опубликована: Окт. 3, 2021

Abstract Using non‐halogenated solvents to process organic solar cells is preferable because they are less harmful human health. However, it challenging mitigate the delicate trade‐offs between solubility and pre‐aggregation of semiconductors maintain similar high device efficiencies as those processed by chlorinated solvents. The need for rigorous control kinetics processing temperature delay time inevitably complicates achieving reproducible performance. Herein, authors develop a facile method achieve proper in selecting suitable donor/acceptor materials subtle tuning solvent compositions. This results films with degree ordering suitably sized phase separation. Solar derived from this can power conversion efficiency up 18%, which highest value reported devices. impressive result achieved through synergistically reduced non‐radiative loss enhanced charge generation.

Язык: Английский

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