A facile strategy for third-component selection in non-fullerene acceptor-based ternary organic solar cells

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(9), P. 5009 - 5016

Published: Jan. 1, 2021

We synthesized three fluorinated non-fullerene acceptors, BTP-F, Y6-F and L8-BO-F, further used them as the third components to fabricate ternary organic solar cells. The PM6:BTP-eC9:BTP-F device yielded a high efficiency of 18.45%.

Language: Английский

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Alkyl‐Chain Branching of Non‐Fullerene Acceptors Flanking Conjugated Side Groups toward Highly Efficient Organic Solar Cells

Advanced Energy Materials, Journal Year: 2021, Volume and Issue: 11(47)

Published: Oct. 29, 2021

Abstract Side‐chain modifications of non‐fullerene acceptors (NFAs) are essential for harvesting their full potential in organic solar cells (OSC). Here, an effective alkyl‐chain‐branching approach the Y‐series NFAs flanking meta‐substituted phenyl side groups at outer positions is demonstrated. Compared to BTP‐4F‐PC6 with linear m ‐hexylphenyl chains, two new named BTP‐4F‐P2EH and BTP‐4F‐P3EH developed bulkier alkyl chains branched β γ positions, respectively. These result altered molecular packing afford higher open‐circuit voltage devices. Despite blue‐shifted absorption branched‐chain NFAs, blends PBDB‐T‐2F enable improved short‐circuit current density corresponding devices owing more suitable phase separation better exciton dissociation. Consequently, OSCs based on yield enhanced device performance 18.22% 17.57%, respectively, outperforming BTP‐4F‐PC6‐based ones (17.22%). results highlight that side‐chain branching design has great optimizing properties promoting photovoltaic performance.

Language: Английский

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Narrowband organic photodetectors – towards miniaturized, spectroscopic sensing

Materials Horizons, Journal Year: 2021, Volume and Issue: 9(1), P. 220 - 251

Published: Oct. 27, 2021

Organic photodetectors can achieve narrowband photodetection within a single optoelectronic device. This comprehensive review summarizes and compares the different approaches, introduces their application fields, outlines current challenges.

Language: Английский

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Simple Nonfused‐Ring Electron Acceptors with Noncovalently Conformational Locks for Low‐Cost and High‐Performance Organic Solar Cells Enabled by End‐Group Engineering

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 32(5)

Published: Oct. 20, 2021

Abstract The rapid advance of fused‐ring electron acceptors (FREAs) has greatly promoted the leap‐forward development organic solar cells (OSCs). However, synthetic complexity FREAs may be detrimental for future commercial applications. Recently, nonfused‐ring (NREAs) have been developed to a promising candidate maintain rational balance between cost and performance, which cores are composed simple fused rings (NREAs‐I) or nonfused (NREAs‐II). Moreover, “noncovalently conformational locks”, used as an effective strategy enhance rigidity planarity NREAs improve device performance. Herein, novel series NREAs‐II (PhO4T‐1, PhO4T‐2, PhO4T‐3) is constructed valuable platform exploring impact end group engineering on optoelectronic properties, intermolecular packing behaviors, As result, high power conversion efficiency 13.76% achieved PhO4T‐3 based OSCs, much higher than those PhO4T‐1 PhO4T‐2‐based devices. Compared with several representative FREAs, possesses highest figure‐of‐merit value 133.45 cost‐efficiency evaluation. This work demonstrates that simple‐structured candidates low‐cost high‐performance OSCs.

Language: Английский

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From Solution to Thin Film: Molecular Assembly of π-Conjugated Systems and Impact on (Opto)electronic Properties

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(13), P. 8395 - 8487

Published: June 5, 2023

The assembly of conjugated organic molecules from solution to solid-state plays a critical role in determining the thin film morphology and optoelectronic properties solution-processed electronics photovoltaics. During evaporative processing, π-conjugated systems can assemble via various forms intermolecular interactions, forming distinct aggregate structures that drastically tune charge transport landscape solid-state. In blend composed donor polymer acceptor molecules, neat materials couples with phase separation crystallization processes, leading complex transition pathways which govern morphology. this review, we provide an in-depth review molecular processes polymers nonfullerene small molecule acceptors discuss their impact on properties. We then shift our focus relevant solar cells fundamentals highlight how processing conditions affect device performance.

Language: Английский

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Models and mechanisms of ternary organic solar cells

Nature Reviews Materials, Journal Year: 2023, Volume and Issue: 8(7), P. 456 - 471

Published: March 17, 2023

Language: Английский

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Recent progress in low‐cost noncovalently fused‐ring electron acceptors for organic solar cells

Aggregate, Journal Year: 2022, Volume and Issue: 3(6)

Published: Oct. 13, 2022

Abstract The power conversion efficiencies (PCEs) of organic solar cells (OSCs) have improved considerably in recent years with the development fused‐ring electron acceptors (FREAs). Currently, FREAs‐based OSCs achieved high PCEs over 19% single‐junction OSCs. Whereas relatively synthetic complexity and low yield FREAs typically result production costs, hindering commercial application In contrast, noncovalently (NFREAs) can compensate for shortcomings facilitate large‐scale industrial by virtue simple structure, facile synthesis, yield, cost, reasonable efficiency. At present, based on NFREAs exceeded 15% are expected to reach comparable efficiency as Here, advances this review provide insight into improving performance particular, paper focuses effect chemical structures molecule conformation, aggregation, packing mode. Various molecular design strategies, such core, side‐chain, terminal group engineering, presented. addition, some novel polymer all‐polymer also introduced. end, provides an outlook developing efficient, stable, low‐cost achieving applications.

Language: Английский

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Cascaded energy landscape as a key driver for slow yet efficient charge separation with small energy offset in organic solar cells

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(4), P. 1545 - 1555

Published: Jan. 1, 2022

We examined the mechanisms underlying free carrier generation in a very topical PM6/Y6 organic solar cell. observed slow yet efficient spatial charge dissociation driven by downhill energy relaxation through interfacial cascade.

Language: Английский

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Structurally Complementary Star‐Shaped Unfused Ring Electron Acceptors with Simultaneously Enhanced Device Parameters for Ternary Organic Solar Cells

Solar RRL, Journal Year: 2023, Volume and Issue: 7(11)

Published: April 8, 2023

Ternary strategy has attracted extensive attention for bulk heterojunction organic solar cells (BHJ OSCs) owing to their potentially improved light harvesting, cascaded energy levels, and optimized film morphology of binary BHJs. Herein, three novel star‐shaped unfused ring electron acceptors (SSUFREAs), i.e., H 1–3, with without fluorine‐substituent in phenyl core or peripheral group are designed synthesized as third components via direct C–H arylation incorporate into PM6:Y6 BHJ films. The structure–property–performance dependence study reveals that the isotropic charge transfer, complementary star‐shape structure absorption, energy‐level cascades 1–3 PM6 Y6 allow ternary BHJs have higher power conversion efficiency (PCE) compared BHJ. Among them, involving fluorine‐free 1, 1:PM6:Y6, possesses highest PCE (16.57%) high‐lying frontier molecular orbital enlarged torsion angle, which enhances open‐circuit voltage, inhibits excessive crystallization Y6, facilitates exciton dissociation well collection. findings indicate SSUFREAs great potential serve optimize improve voltage OSCs.

Language: Английский

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Electrically driven organic laser using integrated OLED pumping

Nature, Journal Year: 2023, Volume and Issue: 621(7980), P. 746 - 752

Published: Sept. 27, 2023

Organic semiconductors are carbon-based materials that combine optoelectronic properties with simple fabrication and the scope for tuning by changing their chemical structure1-3. They have been successfully used to make organic light-emitting diodes2,4,5 (OLEDs, now widely found in mobile phone displays televisions), solar cells1, transistors6 sensors7. However, making electrically driven semiconductor lasers is very challenging8,9. It difficult because typically support only low current densities, suffer substantial absorption from injected charges triplets, additional losses due contacts10,11. In short, injecting into gain medium leads intolerable losses. Here we take an alternative approach which charge injection lasing spatially separated, thereby greatly reducing We achieve this developing integrated device structure efficiently couples OLED, exceptionally high internal-light generation, a polymer distributed feedback laser. Under electrical driving of structure, observe threshold light output versus drive current, narrow emission spectrum formation beam above threshold. These observations confirm lasing. Our results provide electronic has not previously demonstrated, show indirect pumping OLED effective way realizing This provides visible could see applications spectroscopy, metrology sensing.

Language: Английский

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