Tethered Small‐Molecule Acceptors Simultaneously Enhance the Efficiency and Stability of Polymer Solar Cells

Advanced Materials, Год журнала: 2022, Номер 35(2)

Опубликована: Ноя. 17, 2022

Abstract For polymer solar cells (PSCs), the mixture of donors and small‐molecule acceptors (SMAs) is fine‐tuned to realize a favorable kinetically trapped morphology thus commercially viable device efficiency. However, thermodynamic relaxation mixed domains within blend raises concerns related long‐term operational stability devices, especially in record‐holding Y‐series SMAs. Here, new class dimeric Y6‐based SMAs tethered with differential flexible spacers reported regulate their aggregation behavior. In blends PM6, it found that they favor an improved structural order relative Y6 counterpart. Most importantly, show large glass transition temperatures suppress domains. high‐performing blend, unprecedented open circuit voltage 0.87 V realized conversion efficiency 17.85%, while those regular Y6‐base devices only reach 0.84 16.93%, respectively. dimer‐based possesses substantially reduced burn‐in loss, retaining more than 80% initial after operating at maximum power point under continuous illumination for 700 h. The tethering approach provides direction develop PSCs high excellent stability.

Язык: Английский

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Unveiling the Morphological and Physical Mechanism of Burn‐in Loss Alleviation by Ternary Matrix Toward Stable and Efficient All‐Polymer Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(18)

Опубликована: Фев. 10, 2023

All-polymer solar cells (All-PSCs) are considered the most promising candidate in achieving both efficient and stable organic photovoltaic devices, yet field has rarely presented an in-depth understanding of corresponding device stability while efficiency is continuously boosted via innovation polymer acceptors. Herein, a ternary matrix built for all-PSCs with optimized morphology, improved film ductility importantly, better operational than its parental binary counterparts, as platform to study underlying mechanism. The target system PQM-Cl:PTQ10:PY-IT (0.8:0.2:1.2) exhibits alleviated burn-in loss morphology under light soaking, which supports promoted lifetime. comprehensive characterizations fresh light-soaked active layers lead clear illustration opposite morphological physical degradation direction PQM-Cl PTQ10, thus resulting delicate balance at optimal system. Specifically, enlarging tendency shrinking preference PTQ10 terms phase separation leads their mixing phase; hole transfer kinetics PQM-Cl:PY-IT host stabilized by incorporating PTQ10. This work succeeds reaching deep insight into all-PSC's promotion rational design, booms prospect gaining high-performance all-PSCs.

Язык: Английский

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Over 17.4% Efficiency of Layer‐by‐Layer All‐Polymer Solar Cells by Improving Exciton Utilization in Acceptor Layer

Advanced Functional Materials, Год журнала: 2023, Номер 33(28)

Опубликована: Март 27, 2023

Abstract Layer‐by‐layer all‐polymer solar cells (LbL all‐PSCs) are prepared with PM6 and PY‐IT by using sequential spin coating method. The exciton dissociation efficiency in acceptor layer near electrode is rather low due to the limited diffuse distance impossible energy transfer from narrow bandgap wide donor. In this study, less incorporated into enhance electrode. A power conversion (PCE) of 17.45% achieved LbL all‐PSCs incorporating 10 wt% layer, which much larger than 16.04% PCE PM6/PY‐IT‐based all‐PSCs. Over 8% enhancement can be realized attributed enhanced utilization layers confirmed quenched photoluminescence (PL) emission PY‐IT:PM6 films. Meanwhile, charge transport optimized PM6, as molecular arrangement. This study indicates that strategy donor has great potential fabricating efficient improving

Язык: Английский

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Improved Molecular Ordering in a Ternary Blend Enables All‐Polymer Solar Cells over 18% Efficiency

Advanced Materials, Год журнала: 2022, Номер 35(8)

Опубликована: Дек. 3, 2022

Although all-polymer solar cells (all-PSCs) show great commercialization prospects, their power conversion efficiencies (PCEs) still fall behind small molecule acceptor-based counterparts. In blends, the optimized morphology and high molecular ordering are difficult to achieve since there is troublesome competition between crystallinity of polymer donor acceptor during film-formation process. Therefore, it challenging improve performance all-PSCs. Herein, a ternary strategy adopted modulate an blend, in which PM6:PY-82 selected as host blend PY-DT employed guest component. Benefiting from favorable miscibility two acceptors higher regularity PY-DT, matrix features well-defined fibrillar improved ordering. Consequently, champion PM6:PY-82:PY-DT device produces record-high PCE 18.03%, with simultaneously open-circuit voltage, short-circuit current fill factor comparison binary devices. High-performance large-area (1 cm2 ) thick-film (300 nm) all-PSCs also successfully fabricated PCEs 16.35% 15.70%, respectively.Moreover, 16.5 organic module affords encouraging 13.84% when using non-halogenated solvent , showing potential "Lab-to-Fab" transition

Язык: Английский

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Recent Progress in π-Conjugated Polymers for Organic Photovoltaics: Solar Cells and Photodetectors

Progress in Polymer Science, Год журнала: 2023, Номер 143, С. 101711 - 101711

Опубликована: Июнь 25, 2023

Язык: Английский

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Ternary All‐Polymer Solar Cells with Efficiency up to 18.14% Employing a Two‐Step Sequential Deposition

Advanced Materials, Год журнала: 2022, Номер 35(7)

Опубликована: Ноя. 22, 2022

Abstract Achieving a finely tuned active layer morphology with suitable vertical phase to facilitate both charge generation and transport has long been the main goal for pursuing highly efficient bulk heterojunction all‐polymer solar cells (all‐PSCs). Herein, solution address above challenge via synergistically combining ternary blend strategy layer‐by‐layer (LbL) procedure is proposed. By introducing synthesized polymer acceptor ( P A ), PY‐Cl, higher crystallinity into designed host PY‐SSe‐V, distribution molecular ordering of LbL‐type all‐PSCs can be improved in comparison PM6/PY‐SSe‐V binary all‐PSCs. The formation superior microstructure not only promote extraction properties but also reduce energetic disorder non‐radiative recombination loss, thus improving all three photovoltaic parameters simultaneously. Consequently, PM6/(PY‐SSe‐V:PY‐Cl) show best efficiency 18.14%, which among highest values reported date This work provides facile effective obtaining high‐efficiency

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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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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Effects of Halogenation of Small‐Molecule and Polymeric Acceptors for Efficient Organic Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 33(22)

Опубликована: Фев. 23, 2023

Abstract Tuning the properties of non‐fullerene acceptors (NFAs) through halogenation, including fluorination and chlorination, represents one most promising strategies to boost performance organic solar cells (OSCs). However, it remains unclear how F Cl choice influences molecular packing between small‐molecule polymeric acceptors. Here, a series with different amounts types halogenation is synthesized, effects chlorination are investigated. It found that chlorinated lead longer exciton diffusion length better compared corresponding fluorinated ones, which attributes their stronger intermolecular mode. For polymer acceptors, in contrast, polymers achieve denser mode performance, because exhibit reduced intrachain conjugation end group moieties linker units. This study demonstrates on modes performances for provides important guidance molecule design high‐performance OSCs.

Язык: Английский

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Poly(dimethylsiloxane)‐block‐PM6 Polymer Donors for High‐Performance and Mechanically Robust Polymer Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(24)

Опубликована: Март 17, 2023

High power conversion efficiency (PCE) and stretchability are the dual requirements for wearable application of polymer solar cells (PSCs). However, most efficient photoactive films mechanically brittle. In this work, highly (PCE = 18%) robust (crack-onset strain (COS) PSCs acheived by designing block copolymer (BCP) donors, PM6-b-PDMSx (x 5k, 12k, 19k). these BCP stretchable poly(dimethylsiloxane) (PDMS) blocks covalently linked with PM6 to effectively increase stretchability. The donors increases a longer PDMS block, PM6-b-PDMS19k :L8-BO PSC exhibits high PCE (18%) 9-times higher COS value compared that (COS 2%) PM6:L8-BO-based PSC. PM6:L8-BO:PDMS12k ternary blend shows inferior (5%) (1%) due macrophase separation between active components. intrinsically PSC, significantly greater mechanical stability PCE80% ((80% initial PCE) at 36% strain) than those PM6:L8-BO (PCE80% 12% PM6:L8-BO:PDMS 4% strain). This study suggests an effective design strategy PD achieve PSCs.

Язык: Английский

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