Y‐Type Non‐Fullerene Acceptors with Outer Branched Side Chains and Inner Cyclohexane Side Chains for 19.36% Efficiency Polymer Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(10)

Опубликована: Янв. 5, 2023

Abstract Raising the lowest unoccupied molecular orbital (LUMO) energy level of Y‐type non‐fullerene acceptors can increase open‐circuit voltage ( V oc ) and thus photovoltaic performance current top performing polymer solar cells (PSCs). One viable routes is demonstrated by successful Y6 derivative L8‐BO with branched alkyl chains at outer side. This will introduce steric hindrance reduce intermolecular aggregation, open up bandgap raise LUMO level. To take further advantages influence on optoelectronic properties derivatives, two BTP‐Cy‐4F BTP‐Cy‐4Cl are designed synthesized adopting side inner cyclohexane chains. An outstanding 0.937 achieved in D18:BTP‐Cy‐4F binary blend devices along a power conversion efficiency (PCE) 18.52%. With addition BTP‐eC9 to extend absorption spectral coverage, remarkable PCE 19.36% realized finally related ternary devices, which one highest values for single‐junction PSCs present. The results illustrate great potential constructing high‐performance their PSCs.

Язык: Английский

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High‐Performance All‐Polymer Solar Cells with a Pseudo‐Bilayer Configuration Enabled by a Stepwise Optimization Strategy

Advanced Functional Materials, Год журнала: 2021, Номер 31(15)

Опубликована: Фев. 10, 2021

Abstract In this work, an efficiency of 15.17% in the PBDB‐T/PYT all‐PSCs fabricated by a layer‐by‐layer (LbL) deposition technique is achieved synergistically controlling additive dosages, which not only higher than that (14.06%) corresponding bulk heterojunction (BHJ) device, but also top efficient for all‐PSCs. Through studies physical dynamics and morphological characteristics, it found LbL film can effectively improve optical electronic properties, ensure exciton separation, charge generation extraction, reduce trap‐assisted recombination, facilitate hole transfer blends, thus achieving performance compared to its BHJ counterpart. Notably, synergistic regulation dosages donor acceptor solutions confirmed other three photovoltaic systems. Of particular note over 15% device via blade‐coating technique, further demonstrating great significance additive‐doping strategy printing fabrication organic photovoltaics.

Язык: Английский

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A conjugated donor-acceptor block copolymer enables over 11% efficiency for single-component polymer solar cells

Joule, Год журнала: 2021, Номер 5(7), С. 1800 - 1815

Опубликована: Июнь 3, 2021

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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A Random Terpolymer Donor with Similar Monomers Enables 18.28% Efficiency Binary Organic Solar Cells with Well Polymer Batch Reproducibility

ACS Energy Letters, Год журнала: 2022, Номер 7(9), С. 3045 - 3057

Опубликована: Авг. 19, 2022

Herein, by using two fluorinated and chlorinated monomers with similar structures in different molar ratios dithieno[3′,2′:3,4;2″,3″:5,6]benzo[1,2-c][1,2,5]thiadiazole (DTBT) as the third unit, a family of polymer donors D18, D18–20%Cl, D18–40%Cl, D18–Cl are synthesized for OSCs. With appropriate monomer proportion, terpolymer D18–20%Cl exhibits proper HOMO energy level higher packing density compared that other control polymers. Moreover, D18–20%Cl:Y6 blend films have favorable morphology better face-on crystallization charge transport. Consequently, D18–20%Cl:Y6-based OSCs obtain top-ranked PCE 18.28% overall improved device parameters to controlled D18:Y6 or D18-Cl:Y6-based (17.50% 17.02%), which represents highest reported terpolymer-based binary Notably, exhibit over 17% efficiency wide molecular weight range. These results demonstrate ternary copolymerization DTBT moieties is an efficient approach achieving well batch-to-batch reproducibility.

Язык: Английский

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Efficient all-small-molecule organic solar cells processed with non-halogen solvent

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

Опубликована: Март 2, 2024

Abstract All-small-molecule organic solar cells with good batch-to-batch reproducibility combined non-halogen solvent processing show great potential for commercialization. However, of all-small-molecule are rarely reported and its power conversion efficiencies very difficult to improve. Herein, we designed synthesized a small molecule donor BM-ClEH that can take advantage strong aggregation property induced by intramolecular chlorine-sulfur non-covalent interaction improve molecular pre-aggregation in tetrahydrofuran corresponding micromorphology after film formation. Tetrahydrofuran-fabricated based on BM-ClEH:BO-4Cl achieved high 15.0% binary device 16.1% ternary under thermal annealing treatment. In contrast, weakly aggregated BM-HEH without bond is almost inefficient same conditions due poor disordered π-π stacking, indistinct phase separation exciton dissociation. This work promotes the development provides further guidance.

Язык: Английский

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Machine learning for accelerating the discovery of high-performance donor/acceptor pairs in non-fullerene organic solar cells

npj Computational Materials, Год журнала: 2020, Номер 6(1)

Опубликована: Авг. 13, 2020

Abstract Integrating artificial intelligence (AI) and computer science together with current approaches in material synthesis optimization will act as an effective approach for speeding up the discovery of high-performance photoactive materials organic solar cells (OSCs). Yet, like model selection statistics, choice appropriate machine learning (ML) algorithms plays a vital role process new databases. In this study, we constructed five common algorithms, introduced 565 donor/acceptor (D/A) combinations training data sets to evaluate practicalities these ML their application potential when guiding design D/A pairs screening. Thus, best predictive capabilities are provided by using random forest (RF) boosted regression trees (BRT) beyond other set. Furthermore, >32 million were screened calculated RF BRT models, respectively. Among them, six photovoltaic selected synthesized compare predicted experimental power conversion efficiencies. The outcome experiment verification demonstrates that can be effectively applied high-throughput virtual screening opening perspectives pairs, thereby accelerating development OSCs.

Язык: Английский

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Ferrocene as a highly volatile solid additive in non-fullerene organic solar cells with enhanced photovoltaic performance

Energy & Environmental Science, Год журнала: 2020, Номер 13(12), С. 5117 - 5125

Опубликована: Янв. 1, 2020

Ferrocene was introduced as a solid additive in organic solar cells (OSCs). The use of ferrocene provides PM6:Y6 based device with improved performance and stability, demonstrating its great potential the fabrication efficient stable OSCs.

Язык: Английский

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Fluorinated End Group Enables High‐Performance All‐Polymer Solar Cells with Near‐Infrared Absorption and Enhanced Device Efficiency over 14%

Advanced Energy Materials, Год журнала: 2020, Номер 11(4)

Опубликована: Дек. 13, 2020

Abstract Fluorination of end groups has been a great success in developing efficient small molecule acceptors. However, this strategy not applied to the development polymer Here, dihalogenated group modified by fluorine and bromine atoms simultaneously, namely IC‐FBr, is first developed, then employed construct new acceptor (named PYF‐T) for all‐polymer solar cells (all‐PSCs). In comparison with its non‐fluorinated counterpart (PY‐T), PYF‐T exhibits stronger red‐shifted absorption spectra, molecular packing higher electron mobility. Meanwhile, fluorination on down‐shifts energy levels PYF‐T, which matches better donor PM6, leading charge transfer voltage loss. As result, an all‐PSC based PM6:PYF‐T yields power conversion efficiency (PCE) 14.1% than that PM6:PY‐T (11.1%), among highest values all‐PSCs reported date. This work demonstrates effectiveness end‐groups designing high‐performance acceptors, paves way toward more stable all‐PSCs.

Язык: Английский

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Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Advanced Energy Materials, Год журнала: 2020, Номер 10(45)

Опубликована: Окт. 15, 2020

Abstract With the advances in organic photovoltaics (OPVs), development of low‐cost and easily accessible polymer donors is vital importance for OPV commercialization. Polythiophene (PT) its derivatives stand out as most promising members photovoltaic material family commercial applications, owing to their low cost high scalability synthesis. In recent years, PTs, paired with nonfullerene acceptors, have progressed rapidly performance. This Review gives an overview strategies designing PTs OPVs from perspective energy level modulation. A survey typical classes acceptors designed pairing benchmark PT, i.e., poly(3‐hexylthiophene) (P3HT) also presented. Furthermore, achievements understanding controlling film morphology PT:nonfullerene blends are discussed depth. addition effects molecular weight blend ratio on morphology, crucial roles miscibility between PT processing solvent determining microstructure highlighted, followed by a discussion thermal annealing ternary active layers. Finally, remaining questions prospects systems outlined. It hoped that this review can guide optimization advance applications.

Язык: Английский

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