Double Asymmetric Core Optimizes Crystal Packing to Enable Selenophene‐based Acceptor with Over 18 % Efficiency in Binary Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(10)

Опубликована: Янв. 2, 2023

Side-chain tailoring is a promising method to optimize the performance of organic solar cells (OSCs). However, asymmetric alkyl chain-based small molecular acceptors (SMAs) are still difficult afford. Herein, we adopted novel n-nonyl/undecyl substitution strategy and synthesized two A-D1 A'D2 -A double isomeric SMAs with selenophene-based central core for OSCs. Crystallographic analysis indicates that AYT9Se11-Cl forms more compact order intermolecular packing compared AYT11Se9-Cl, which contributed higher electron mobility in neat film. Moreover, PM6 : blend film shows better morphology appropriate phase separation distinct face-on orientation than AYT11Se9-Cl. The OSCs obtain superior PCE 18.12 % AYT11Se9-Cl (17.52 %), best efficiency selenium-incorporated binary BHJ Our findings elucidate chains precisely modulates crystal enhances photovoltaic selenophene-incorporated SMAs.

Язык: Английский

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Molecular level understanding of the chalcogen atom effect on chalcogen-based polymers through electrostatic potential, non-covalent interactions, excited state behaviour, and radial distribution function

Polymer Chemistry, Год журнала: 2022, Номер 13(42), С. 5993 - 6001

Опубликована: Янв. 1, 2022

Multi-dimensional modelling was used to study the effect of chalcogen atoms on non-covalent interactions, structural and electronic properties polymer materials. Their bulk were also studied at molecular level.

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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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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Selective halogenation of central and end-units of nonfullerene acceptors enables enhanced molecular packing and photovoltaic performance

Energy & Environmental Science, Год журнала: 2023, Номер 16(8), С. 3543 - 3551

Опубликована: Янв. 1, 2023

Qx- p -4Cl with both a para -fluorinated central unit and chlorinated end groups exhibits enhanced molecular packing, facilitating efficient charge transport, thus achieving power conversion efficiency (PCE) of 18.78% when blended donor PM6.

Язык: Английский

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High Open‐Circuit Voltage Organic Solar Cells with 19.2% Efficiency Enabled by Synergistic Side‐Chain Engineering

Advanced Materials, Год журнала: 2024, Номер 36(26)

Опубликована: Март 28, 2024

Abstract Restricted by the energy‐gap law, state‐of‐the‐art organic solar cells (OSCs) exhibit relatively low open‐circuit voltage ( V OC ) because of large nonradiative energy losses (Δ E nonrad ). Moreover, trade‐off between and external quantum efficiency (EQE) OSCs is more distinctive; power conversion efficiencies (PCEs) are still <15% with s >1.0 V. Herein, electronic properties aggregation behaviors non‐fullerene acceptors (NFAs) carefully considered then a new NFA (Z19) delicately designed simultaneously introducing alkoxy phenyl‐substituted alkyl chains to conjugated backbone. Z19 exhibits hypochromatic‐shifted absorption spectrum, high‐lying lowest unoccupied molecular orbital level ordered 2D packing mode. The D18:Z19‐based blend film favorable phase separation face‐on dominated orientation, facilitating charge transport properties. Consequently, D18:Z19 binary devices afford an exciting PCE 19.2% high 1.002 V, surpassing Y6‐2O‐based devices. former highest reported date for Δ Z19‐ (0.200 eV) (0.155 lower than that Y6‐based (0.239 Indications design such NFA, considering could promote breakthrough in OSCs.

Язык: Английский

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Iodinated Electron Acceptor with Significantly Extended Exciton Diffusion Length for Efficient Organic Photovoltaic Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(9)

Опубликована: Янв. 11, 2024

Iodination has unlocked new potentials in organic photovoltaics (OPVs). A newly designed and synthesized iodinated non-fullerene acceptor, BO-4I, showcases exceptional excitation delocalization property with the exciton diffusion length increased to 80 nm. The enhanced electron is attributed larger atomic radius orbit of iodine atom, which facilitates formation intra-moiety excitations acceptor phase. This effectively circumvents charge transfer state-related recombination mechanisms, leading a substantial reduction non-radiative energy loss (ΔE

Язык: Английский

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Learning from Fullerenes and Predicting for Y6: Machine Learning and High‐Throughput Screening of Small Molecule Donors for Organic Solar Cells

Energy Technology, Год журнала: 2022, Номер 10(6)

Опубликована: Апрель 1, 2022

In recent years, research on the development of organic solar cells has increased significantly. For last few machine learning (ML) been gaining attention scientific community working cells. Herein, ML is used to screen small molecule donors for models are fed by molecular descriptors. Various employed. The predictive capability a support vector found be higher (Pearson's coefficient = 0.75). best with fullerene acceptors selected pair Y6. New also designed taking into account quantum chemistry principles, using building units that searched through similarity analysis. Their energy levels and power conversion efficiencies (PCEs) predicted. Efficient PCE > 13% selected. This design discovery pipeline provides an easy fast way select potential candidates experimental work.

Язык: Английский

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Organic photovoltaic cells offer ultrahigh VOC of ∼ 1.2 V under AM 1.5G light and a high efficiency of 21.2 % under indoor light

Chemical Engineering Journal, Год журнала: 2022, Номер 451, С. 139080 - 139080

Опубликована: Сен. 8, 2022

Язык: Английский

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