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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Smart Ternary Strategy in Promoting the Performance of Polymer Solar Cells Based on Bulk‐Heterojunction or Layer‐By‐Layer Structure

Small, Journal Year: 2021, Volume and Issue: 18(4)

Published: Nov. 28, 2021

Although the rapid development of polymer solar cells (PSCs) has been achieved, it is still a great challenge to explore efficient ways for improving power conversion efficiency (PCE) PSCs from materials and device engineering. Ternary strategy confirmed as an way improve PCE by employing three kinds materials. In this work, one donor PM6, two non-fullerene N3 MF1 are selected prepare ternary with layer-by-layer (LbL) or bulk-heterojunction (BHJ) structure. The LbL BHJ-PSCs exhibit PCEs 16.75% 16.76% 15 wt% content in acceptors, corresponding over 5% 4% improvement compared N3-based binary BHJ mainly attributed fill factor enhancement 73.29% 76.95% LbL-PSCs 74.13% 77.51% strategy. This work indicates that potential preparing highly via simultaneously optimizing molecular arrangement thickness each layer.

Language: Английский

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The effect of alkyl substitution position of thienyl outer side chains on photovoltaic performance of A–DA′D–A type acceptors

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(5), P. 2011 - 2020

Published: Jan. 1, 2022

Two isomeric A–DA′D–A type SMAs o -TEH and m were designed synthesized, the PCE of OSC based on PBQ6: reached 18.51%.

Language: Английский

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19.28% Efficiency and Stable Polymer Solar Cells Enabled by Introducing an NIR‐Absorbing Guest Acceptor

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(8)

Published: Jan. 6, 2023

Abstract Here, a near‐infrared (NIR)‐absorbing small‐molecule acceptor (SMA) Y‐SeNF with strong intermolecular interaction and crystallinity is developed by combining selenophene‐fused core naphthalene‐containing end‐group, then as custom‐tailor guest incorporated into the binary PM6:L8‐BO host system. shows 65 nm red‐shifted absorption compared to L8‐BO. Thanks of Y‐SeNF, morphology PM6:L8‐BO:Y‐SeNF can be precisely regulated introducing achieving improved charge‐transporting suppressed non‐radiative energy loss. Consequently, ternary polymer solar cells (PSCs) offer an impressive device efficiency 19.28% both high photovoltage (0.873 V) photocurrent (27.88 mA cm −2 ), which one highest efficiencies in reported single‐junction PSCs. Notably, PSC has excellent stability under maximum‐power‐point tracking for even over 200 h, better than its parental devices. The study provides novel strategy construct NIR‐absorbing SMA efficient stable PSCs toward practical applications.

Language: Английский

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Revealing the underlying solvent effect on film morphology in high-efficiency organic solar cells through combinedex situandin situobservations

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(5), P. 2316 - 2326

Published: Jan. 1, 2023

Here the aggregation behavior differences induced by solvent–material and material–material interactions are clearly revealed combined ex situ in morphology characterization studies on representative high-efficiency OPV systems.

Language: Английский

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High performance polymerized small molecule acceptor by synergistic optimization on π-bridge linker and side chain

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Sept. 7, 2022

The polymerized small-molecule acceptors have attracted great attention for application as polymer acceptor in all-polymer solar cells recently. modification of small molecule building block and the π-bridge linker is an effective strategy to improve photovoltaic performance acceptors. In this work, we synthesized a new PG-IT2F which representative PY-IT by replacing its upper linear alkyl side chains on with branched attaching difluorene substituents thiophene linker. Through synergistic optimization, possesses more suitable phase separation, increased charge transportation, better exciton dissociation, lower bimolecular recombination, longer transfer state lifetime than their PM6 donor. Therefore, devices based PM6:PG-IT2F demonstrated high power conversion efficiency 17.24%, one highest reported binary all date. This work indicates that regulation plays key role designing developing highly efficient

Language: Английский

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Giant Molecule Acceptor Enables Highly Efficient Organic Solar Cells Processed Using Non‐halogenated Solvent

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(26)

Published: April 26, 2023

High efficiency organic solar cells (OSCs) based on A-DA'D-A type small molecule acceptors (SMAs) were mostly fabricated by toxic halogenated solvent processing, and power conversion (PCE) of the non-halogenated processed OSCs is mainly restricted excessive aggregation SMAs. To address this issue, we developed two vinyl π-spacer linking-site isomerized giant (GMAs) with linking inner carbon (EV-i) or out (EV-o) benzene end group SMA longer alkyl side chains (ECOD) for capability solvent-processing. Interestingly, EV-i possesses a twisted molecular structure but enhanced conjugation, while EV-o shows better planar weakened conjugation. The OSC as acceptor o-xylene (o-XY) demonstrated higher PCE 18.27 % than that devices ECOD (16.40 %) (2.50 %). one highest PCEs among from solvents so far, benefitted suitable structure, stronger absorbance high charge carrier mobility EV-i. results indicate GMAs site would be excellent candidates fabricating performance solvents.

Language: 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, Journal Year: 2022, Volume and Issue: 13(42), P. 5993 - 6001

Published: Jan. 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.

Language: Английский

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Recent Developments of Polymer Solar Cells with Photovoltaic Performance over 17%

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(14)

Published: Jan. 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.

Language: Английский

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Over 19.1% efficiency for sequentially spin-coated polymer solar cells by employing ternary strategy

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 471, P. 144711 - 144711

Published: July 13, 2023

Language: Английский

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