Renewed Prospects for Organic Photovoltaics

Chemical Reviews, Journal Year: 2022, Volume and Issue: 122(18), P. 14180 - 14274

Published: Aug. 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.

Language: Английский

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Single‐Junction Organic Solar Cells with 19.17% Efficiency Enabled by Introducing One Asymmetric Guest Acceptor

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(26)

Published: April 19, 2022

The ternary strategy has been widely identified as an effective approach to obtain high-efficiency organic solar cells (OSCs). However, for most OSCs, the nonradiative voltage loss lies between those of two binary devices, which limits further efficiency improvements. Herein, asymmetric guest acceptor BTP-2F2Cl is designed and incorporated into a PM1:L8-BO host blend. Compared with L8-BO neat film, L8-BO:BTP-2F2Cl blend film shows higher photoluminescence quantum yield larger exciton diffusion length. Introducing extends its absorption spectrum, improves molecular packing materials, suppresses charge recombination OSCs. Consequently, power conversion improved up 19.17% (certified value 18.7%), represents highest reported single-junction OSCs so far. results show that improving behaviors promising reducing realizing high-performance

Language: Английский

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Realizing 19.05% Efficiency Polymer Solar Cells by Progressively Improving Charge Extraction and Suppressing Charge Recombination

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(13)

Published: Jan. 26, 2022

Improving charge extraction and suppressing recombination are critically important to minimize the loss of absorbed photons improve device performance polymer solar cells (PSCs). In this work, highly efficient PSCs demonstrated by progressively improving through combination side-chain engineering new nonfullerene acceptors (NFAs), adopting ternary blends, introducing volatilizable solid additives. The 2D side chains on BTP-Th induce a certain steric hindrance for molecular packing phase separation, which is mitigated fluorination BTP-FTh. Moreover, two crystalline molecules as second acceptor additive, respectively, into BTP-FTh-based host blend, crystallinity significantly improved blend morphology finely optimized. As expected, enhanced suppressed realized, contributing largely fill factor (FF) resultant devices. Accompanied open-circuit voltage (Voc ) short-circuit current density (Jsc ), record high power conversion efficiency (PCE) 19.05% realized finally.

Language: Английский

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19.31% binary organic solar cell and low non-radiative recombination enabled by non-monotonic intermediate state transition

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

Published: March 30, 2023

Non-fullerene acceptors based organic solar cells represent the frontier of field, owing to both materials and morphology manipulation innovations. Non-radiative recombination loss suppression performance boosting are in center cell research. Here, we developed a non-monotonic intermediate state strategy for state-of-the-art by employing 1,3,5-trichlorobenzene as crystallization regulator, which optimizes film process, regulates self-organization bulk-heterojunction manner, i.e., first enhancing then relaxing molecular aggregation. As result, excessive aggregation non-fullerene is avoided have achieved efficient with reduced non-radiative loss. In PM6:BTP-eC9 cell, our successfully offers record binary efficiency 19.31% (18.93% certified) very low 0.190 eV. And lower 0.168 eV further PM1:BTP-eC9 (19.10% efficiency), giving great promise future

Language: Английский

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Desired open-circuit voltage increase enables efficiencies approaching 19% in symmetric-asymmetric molecule ternary organic photovoltaics

Joule, Journal Year: 2022, Volume and Issue: 6(3), P. 662 - 675

Published: Feb. 25, 2022

Language: Английский

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Compromising Charge Generation and Recombination of Organic Photovoltaics with Mixed Diluent Strategy for Certified 19.4% Efficiency

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(21)

Published: March 3, 2023

The ternary blend is demonstrated as an effective strategy to promote the device performance of organic photovoltaics (OPVs) due dilution effect. While compromise between charge generation and recombination remains a challenge. Here, mixed diluent for further improving efficiency OPV proposed. Specifically, high-performance system with polymer donor, i.e., PM6, nonfullerene acceptor (NFA), BTP-eC9, diluted by diluents, which involve high bandgap NFA BTP-S17 low BTP-S16 (similar that BTP-eC9). better miscibility BTP-eC9 can dramatically enhance open-circuit voltage (VOC ), while maximizes or short-circuit current density (JSC ). interplay BTP-17 enables recombination, thus leading 19.76% (certified 19.41%), best among single-junction OPVs. Further analysis on carrier dynamics validates efficacy diluents balancing be attributed more diverse energetic landscapes improved morphology. Therefore, this work provides commercialization.

Language: Английский

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Ternary Blend Organic Solar Cells: Understanding the Morphology from Recent Progress

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(46)

Published: Nov. 19, 2021

Ternary blend organic solar cells (TB-OSCs) incorporating multiple donor and/or acceptor materials into the active layer have emerged as a promising strategy to simultaneously improve overall device parameters for realizing higher performances than binary devices. Whereas introducing also results in more complicated morphology their counterparts. Understanding is crucially important further improving performance of TB-OSC. This review introduces solubility and miscibility that affect ternary blends. Then, this summarizes recent processes study on blends from aspects molecular crystallinity, packing orientation, domain size purity, directly observation morphology, vertical phase separation well morphological stability. Finally, summary prospects TB-OSCs are concluded.

Language: Английский

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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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Thermoplastic Elastomer Tunes Phase Structure and Promotes Stretchability of High‐Efficiency Organic Solar Cells

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(49)

Published: Oct. 11, 2021

Top-performance organic solar cells (OSCs) consisting of conjugated polymer donors and nonfullerene small molecule acceptors (NF-SMAs) deliver rapid increases in efficiencies. Nevertheless, many the exhibit high stiffness are very brittle, which limit their applications wearable devices. Here, a simple effective strategy is reported to improve stretchability reduce high-efficiency polymer:NF-SMA blends simultaneously maintain efficiency by incorporating low-cost commercial thermoplastic elastomer, polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS). The microstructure, mechanical properties, photovoltaic performance PM6:N3 with varied SEBS contents molecular weight dependence on microstructure properties thoroughly characterized. This for improvement exhibits excellent applicability some other OSC blend systems, e.g., PBQx-TF:eC9-2Cl PBDB-T:ITIC. More crucially, elastic modulus such complex ternary can be nicely predicted model. Therefore, elastomers widely applicable cost-effective OSCs beyond.

Language: Английский

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Polymer Solar Cells with 18.74% Efficiency: From Bulk Heterojunction to Interdigitated Bulk Heterojunction

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 32(4)

Published: Oct. 13, 2021

Abstract The most popular approach to fabricating organic solar cells (OSCs) is solution processing a mixture of donor (D) and acceptor (A) materials into an active layer with bulk heterojunction (BHJ) nanostructure. Herein, it demonstrated that the interdigitated (IHJ) more suitable nanostructure for high‐performance OSCs whereas long standing challenge realize well‐defined IHJ structures. In this study, facile versatile sequential method developed produce power conversion efficiency reaching 18.74% (18.10% BHJ counterpart) by film nanopores created wax additive, sequentially casting on top infiltrating nanopores. Compared BHJ, structure interpillar distance within exciton diffusion length can afford large D/A interface efficient dissociation minimized charge recombination while free electrons holes transport respective electrodes through straightforward pathways, thus enhance performance. Furthermore, D or A phase in device contacts only one electrode, which prevent shunting between anode cathode facilitate industrial mass production OSCs.

Language: Английский

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