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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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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Self-Assembled Monolayer Enables Hole Transport Layer-Free Organic Solar Cells with 18% Efficiency and Improved Operational Stability

ACS Energy Letters, Год журнала: 2020, Номер 5(9), С. 2935 - 2944

Опубликована: Авг. 18, 2020

We report on bulk-heterojunction (BHJ) organic photovoltaics (OPVs) based the self-assembled monolayer (SAM) 2PACz as a hole-selective interlayer functionalized directly onto indium tin oxide (ITO) anode. The is found to change work function of ITO while simultaneously affecting morphology BHJ deposited atop. Cells with PM6:N3 and ITO-2PACz anode exhibit power conversion efficiency (PCE) 16.6%, which greater than that measured for bare (6.45%) ITO/PEDOT:PSS (15.94%) devices. enhanced performance attributed lower contact-resistance, reduced bimolecular recombination losses, improved charge transport within BHJ. Importantly, ITO-2PACz-based OPVs show dramatically operational stability when compared PEDOT:PSS-based cells. When combined ternary PM6:BTP-eC9:PC71BM BHJ, resulting cells maximum PCE 18.03%, highlighting potential engineered SAMs use in contacts high-performance OPVs.

Язык: Английский

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Layer‐by‐Layer Processed Ternary Organic Photovoltaics with Efficiency over 18%

Advanced Materials, Год журнала: 2021, Номер 33(12)

Опубликована: Фев. 18, 2021

Abstract Obtaining a finely tuned morphology of the active layer to facilitate both charge generation and extraction has long been goal in field organic photovoltaics (OPVs). Here, solution resolve above challenge via synergistically combining layer‐by‐layer (LbL) procedure ternary strategy is proposed demonstrated. By adding an asymmetric electron acceptor, BTP‐S2, with lower miscibility binary donor:acceptor host PM6:BO‐4Cl, vertical phase distribution can be formed donor‐enrichment at anode acceptor‐enrichment cathode OPV devices during LbL processing. In contrast, LbL‐type OPVs based on PM6:BO‐4Cl still show bulk‐heterojunction like morphology. The formation not only reduce recombination but also promote collection, thus enhancing photocurrent fill factor OPVs. Consequently, exhibit best efficiency 18.16% (certified: 17.8%), which among highest values reported date for work provides facile effective approach achieving high‐efficiency expected morphologies, demonstrates as being promising fabricating from present laboratory study future industrial production.

Язык: Английский

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Reduced non-radiative charge recombination enables organic photovoltaic cell approaching 19% efficiency

Joule, Год журнала: 2021, Номер 5(9), С. 2408 - 2419

Опубликована: Июль 23, 2021

Язык: Английский

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

Advanced Materials, Год журнала: 2022, Номер 34(13)

Опубликована: Янв. 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.

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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Manipulating the D:A interfacial energetics and intermolecular packing for 19.2% efficiency organic photovoltaics

Energy & Environmental Science, Год журнала: 2022, Номер 15(6), С. 2537 - 2544

Опубликована: Янв. 1, 2022

A novel electron acceptor, BTP-H2, demonstrates a high efficiency of 18.5% with V oc 0.932 V. It also enables the ternary device to yield an 19.2%, ranking highest among single-junction organic photovoltaics.

Язык: Английский

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Polymerized Small‐Molecule Acceptors for High‐Performance All‐Polymer Solar Cells

Angewandte Chemie International Edition, Год журнала: 2020, Номер 60(9), С. 4422 - 4433

Опубликована: Авг. 28, 2020

Abstract All‐polymer solar cells (all‐PSCs) have drawn tremendous research interest in recent years, due to their inherent advantages of good film formation, stable morphology, and mechanical flexibility. The most representative widely used n ‐CP acceptor was the naphthalene diimide based D‐A copolymer N2200 before 2017, power conversion efficiency (PCE) all‐PSCs on reached over 8% 2016. However, low absorption coefficient near‐infrared (NIR) region limits further increase its PCE. In we proposed a strategy polymerizing small‐molecule acceptors (SMAs) construct new‐generation polymer acceptors. polymerized SMAs (PSMAs) possess band gap strong NIR region, which attracted great attention drove PCE 15% recently. this Minireview explain design strategies molecular structure PSMAs describe progress. Finally, current challenges future prospects are analyzed discussed.

Язык: Английский

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Achieving over 17% efficiency of ternary all-polymer solar cells with two well-compatible polymer acceptors

Joule, Год журнала: 2021, Номер 5(6), С. 1548 - 1565

Опубликована: Апрель 23, 2021

Язык: Английский

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