A Vinylene‐Linker‐Based Polymer Acceptor Featuring a Coplanar and Rigid Molecular Conformation Enables High‐Performance All‐Polymer Solar Cells with Over 17% Efficiency

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(27)

Published: March 22, 2022

State-of-art Y-series polymer acceptors are typically based on a mono-thiophene linker, which can cause some twisted molecular conformations and thus limit the performance of all-polymer solar cells (all-PSCs). Here, high-performance acceptor vinylene linkers is reported, leads to surprising changes in polymers' conformations, optoelectronic properties, enhanced photovoltaic performance. It found that thiophene or bithiophene (PY-T-γ PY-2T-γ) display significant twisting between end-groups linker units, while vinylene-based (PY-V-γ) exhibits more coplanar rigid conformation. As result, PY-V-γ demonstrates better conjugation tighter interchain stacking, results higher mobility reduced energetic disorder. Furthermore, detailed morphology investigations reveal PY-V-γ-based blend high domain purity fill factor its all-PSCs. With these, efficiency 17.1% achieved all-PSCs, highest reported for binary all-PSCs date. This work vinylene-linker superior unit build with chain conformation, beneficial aggregation efficient

Language: Английский

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Regio‐Regular Polymer Acceptors Enabled by Determined Fluorination on End Groups for All‐Polymer Solar Cells with 15.2 % Efficiency

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(18), P. 10137 - 10146

Published: Jan. 27, 2021

Abstract Polymerization sites of small molecule acceptors (SMAs) play vital roles in determining device performance all‐polymer solar cells (all‐PSCs). Different from our recent work about fluoro‐ and bromo‐ co‐modified end group IC‐FBr (a mixture IC‐FBr1 IC‐FBr2), this paper, we synthesized purified two regiospecific substituted groups (IC‐FBr‐ o & IC‐FBr‐ m ), which were then employed to construct regio‐regular polymer named PYF‐T‐ , respectively . In comparison with its isomeric counterparts different conjugated coupling sites, exhibits stronger bathochromic absorption achieve better photon harvesting. Meanwhile, adopts more ordered inter‐chain packing suitable phase separation after blending the donor PM6, resulted suppressed charge recombination efficient transport. Strikingly, observed a dramatic difference between While devices based on PM6:PYF‐T‐ can yield power conversion efficiency (PCE) 15.2 %, only show poor efficiencies 1.4 %. This demonstrates success configuration‐unique fluorinated designing high‐performance regular acceptors, provides guidelines towards developing all‐PSCs efficiencies.

Language: Английский

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Over 14% efficiency all-polymer solar cells enabled by a low bandgap polymer acceptor with low energy loss and efficient charge separation

Energy & Environmental Science, Journal Year: 2020, Volume and Issue: 13(12), P. 5017 - 5027

Published: Jan. 1, 2020

A low bandgap polymer acceptor PF5-Y5 was synthesized and its all-PSCs achieved an impressive device efficiency of 14.45% with both high V_oc J_sc due to the excellent absorption coverage, small energy loss, efficient charge separation.

Language: Английский

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Flexible organic solar cells: Materials, large-area fabrication techniques and potential applications

Nano Energy, Journal Year: 2021, Volume and Issue: 89, P. 106399 - 106399

Published: Aug. 4, 2021

Language: Английский

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Organoboron Polymer for 10% Efficiency All-Polymer Solar Cells

Chemistry of Materials, Journal Year: 2020, Volume and Issue: 32(3), P. 1308 - 1314

Published: Jan. 10, 2020

Optoelectronic polymers are always π-conjugated consisting of C, H, N, S, and O elements. The main group element chemistry is a new tool to tune the optoelectronic properties polymers. However, resulting generally show moderate device performance because they cannot meet multiple requirements for solution-processed devices. Herein, we report an organoboron polymer, which can be used as polymer acceptor in all-polymer solar cells (all-PSCs) give power conversion efficiency high 10.1%. By incorporating 2,1,3-benzothiadiazole unit backbone, its absorption spectrum, energy levels, electron mobility, phase separation behavior. All these improvements contribute excellent all-PSC performance. These results prove that containing atoms

Language: Английский

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Fine-Tuning Semiconducting Polymer Self-Aggregation and Crystallinity Enables Optimal Morphology and High-Performance Printed All-Polymer Solar Cells

Journal of the American Chemical Society, Journal Year: 2019, Volume and Issue: 142(1), P. 392 - 406

Published: Dec. 3, 2019

Polymer aggregation and crystallization behavior play a crucial role in the performance of all-polymer solar cells (all-PSCs). Gaining control over polymer self-assembly via molecular design to influence bulk-heterojunction active-layer morphology, however, remains challenging. Herein, we show simple yet effective way modulate self-aggregation commonly used naphthalene diimide (NDI)-based acceptor (N2200), by systematically replacing certain amount alkyl side-chains with compact bulky (CBS). Specifically, have synthesized series random copolymer (PNDI-CBSx) different molar fractions (x = 0-1) CBS units found that both solution-phase solid-state crystallinity these polymers are progressively suppressed increasing x as evidenced UV-vis absorption, photoluminescence (PL) spectroscopies, thermal analysis, grazing incidence X-ray scattering (GIWAXS) techniques. Importantly, compared highly self-aggregating N2200, photovoltaic results blending more amorphous donor (PBDB-T) can enable all-PSCs significantly increased PCE (up 8.5%). The higher short-circuit current density (Jsc) from smaller phase-separation domain sizes PL quenching resonant soft (R-SoXS) analyses. Additionally, lower active layer is less sensitive film deposition methods. Thus, transition spin-coating solution coating be easily achieved no losses. On other hand, decreasing too much reduces increases. appear induce formation larger crystallites. These highlight importance balanced strength between achieve high-performance optimal morphology.

Language: Английский

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Organic Solar Cells: Recent Progress and Challenges

ACS Energy Letters, Journal Year: 2019, Volume and Issue: 4(10), P. 2537 - 2539

Published: Oct. 11, 2019

ADVERTISEMENT RETURN TO ISSUEEditorialNEXTOrganic Solar Cells: Recent Progress and ChallengesLin X. ChenLin ChenProfessor of Chemistry, Northwestern University, Evanston, Illinois 60208, United StatesSenior Scientist, Argonne National Laboratory, Lemont, 60439, StatesMore by Lin Chenhttp://orcid.org/0000-0002-8450-6687Cite this: ACS Energy Lett. 2019, 4, 10, 2537–2539Publication Date (Web):October 11, 2019Publication History Published online11 October 2019Published inissue 11 2019https://pubs.acs.org/doi/10.1021/acsenergylett.9b02071https://doi.org/10.1021/acsenergylett.9b02071editorialACS PublicationsCopyright © 2019 American Chemical Society. This publication is available under these Terms Use. Request reuse permissions free to access through this site. Learn MoreArticle Views18352Altmetric-Citations106LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum full text article downloads since November 2008 (both PDF HTML) across all institutions individuals. These metrics regularly updated reflect usage leading up last few days.Citations number other articles citing article, calculated Crossref daily. Find more information about citation counts.The Altmetric Attention Score a quantitative measure attention that research has received online. Clicking on donut icon will load page at altmetric.com with additional details score social media presence for given article. how calculated. Share Add toView InAdd Full Text ReferenceAdd Description ExportRISCitationCitation abstractCitation referencesMore Options onFacebookTwitterWechatLinked InRedditEmail (2 MB) Get e-AlertscloseSUBJECTS:Excitons,Materials,Polymers,Solar cells,Solar energy e-Alerts

Language: Английский

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Efficient, Thermally Stable, and Mechanically Robust All‐Polymer Solar Cells Consisting of the Same Benzodithiophene Unit‐Based Polymer Acceptor and Donor with High Molecular Compatibility

Advanced Energy Materials, Journal Year: 2020, Volume and Issue: 11(5)

Published: Dec. 21, 2020

Abstract All‐polymer solar cells (all‐PSCs) are a highly attractive class of photovoltaics for wearable and portable electronics due to their excellent morphological mechanical stabilities. Recently, new types polymer acceptors ( P A s) consisting non‐fullerene small molecule (NFSMAs) with strong light absorption have been proposed enhance the power conversion efficiency (PCE) all‐PSCs. However, polymerization NFSMAs often reduces entropy mixing in PSC blends prevents formation intermixed blend domains required efficient charge generation stability. One approach increase compatibility these systems is design s that contain same building blocks as donor D ) counterparts. Here, series NFSMA‐based [P(BDT2BOY5‐X), (X = H, F, Cl)] reported, by copolymerizing NFSMA (Y5‐2BO) benzodithiophene (BDT), common donating unit high‐performance such PBDB‐T. All‐PSC composed PBDB‐T P(BDT2BOY5‐X) show enhanced molecular compatibility, resulting electronic properties. Specifically, PBDB‐T:P(BDT2BOY5‐Cl) all‐PSC has PCE 11.12%, which significantly higher than previous PBDB‐T:Y5‐2BO (7.02%) PBDB‐T:P(NDI2OD‐T2) (6.00%) PSCs. Additionally, increased all‐PSCs greatly improves thermal stability robustness. For example, crack onset strain (COS) toughness 15.9% 3.24 MJ m –3 , respectively, comparison at 2.21% 0.32 .

Language: Английский

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Multi‐Selenophene‐Containing Narrow Bandgap Polymer Acceptors for All‐Polymer Solar Cells with over 15 % Efficiency and High Reproducibility

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(29), P. 15935 - 15943

Published: May 3, 2021

Abstract All‐polymer solar cells (all‐PSCs) progressed tremendously due to recent advances in polymerized small molecule acceptors (PSMAs), and their power conversion efficiencies (PCEs) have exceeded 15 %. However, the practical applications of all‐PSCs are still restricted by a lack PSMAs with broad absorption, high electron mobility, low energy loss, good batch‐to‐batch reproducibility. A multi‐selenophene‐containing PSMA, PFY‐3Se, was developed based on selenophene‐fused SMA framework selenophene π‐spacer. Compared its thiophene analogue PFY‐0Se, PFY‐3Se shows ≈30 nm red‐shifted increased improved intermolecular interaction. In all‐PSCs, achieved an impressive PCE 15.1 % both short‐circuit current density 23.6 mA cm −2 fill factor 0.737, which among best values reported date much better than PFY‐0Se (PCE=13.0 %). Notably, maintains similarly properties for realizing reproducible device performance, is first also very rare PSMAs. Moreover, PFY‐3Se‐based show dependence area (0.045–1.0 2 ) active layer thickness (110–250 nm), indicating great potential toward applications.

Language: Английский

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A highly crystalline non-fullerene acceptor enabling efficient indoor organic photovoltaics with high EQE and fill factor

Joule, Journal Year: 2021, Volume and Issue: 5(5), P. 1231 - 1245

Published: April 28, 2021

Language: Английский

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