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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Correlation of Local Isomerization Induced Lateral and Terminal Torsions with Performance and Stability of Organic Photovoltaics

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(10), С. 5909 - 5919

Опубликована: Март 6, 2023

Organic photovoltaics (OPVs) have achieved great progress in recent years due to delicately designed non-fullerene acceptors (NFAs). Compared with tailoring of the aromatic heterocycles on NFA backbone, incorporation conjugated side-groups is a cost-effective way improve photoelectrical properties NFAs. However, modifications also need consider their effects device stability since molecular planarity changes induced by are related aggregation and evolution blend morphology under stresses. Herein, new class NFAs local-isomerized developed impact local isomerization geometries performance/stability systematically investigated. The based one isomers balanced side- terminal-group torsion angles can deliver an impressive power conversion efficiency (PCE) 18.5%, low energy loss (0.528 V) excellent photo- thermal stability. A similar approach be applied another polymer donor achieve even higher PCE 18.8%, which among highest efficiencies obtained for binary OPVs. This work demonstrates effectiveness applying fine-tune side-group steric effect non-covalent interactions between therefore improving both photovoltaic performance fused ring NFA-based

Язык: Английский

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Green-Solvent Processed Blade-Coating Organic Solar Cells with an Efficiency Approaching 19% Enabled by Alkyl-Tailored Acceptors

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Ноя. 2, 2023

Abstract Power-conversion-efficiencies (PCEs) of organic solar cells (OSCs) in laboratory, normally processed by spin-coating technology with toxic halogenated solvents, have reached over 19%. However, there is usually a marked PCE drop when the blade-coating and/or green-solvents toward large-scale printing are used instead, which hampers practical development OSCs. Here, new series N -alkyl-tailored small molecule acceptors named YR-SeNF same molecular main backbone developed combining selenium-fused central-core and naphthalene-fused end-group. Thanks to -alkyl engineering, NIR-absorbing show different crystallinity, packing patterns, miscibility polymeric donor. The studies exhibit that packing, vertical distribution active layer morphologies well optimized introducing newly designed guest acceptor associated tailored chains, providing improved charge transfer dynamics stability for PM6:L8-BO:YR-SeNF-based As result, record-high approaching 19% achieved OSCs fabricated from green-solvent o -xylene high-boiling point. Notably, ternary offer robust operating under maximum-power-point tracking well-keep > 80% initial PCEs even 400 h. Our alkyl-tailored strategy provides unique approach develop high-efficiency stable OSCs, paves way industrial development.

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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Introducing a Phenyl End Group in the Inner Side Chains of A‐DA'D‐A Acceptors Enables High‐Efficiency Organic Solar Cells Processed with Nonhalogenated Solvent

Advanced Materials, Год журнала: 2023, Номер 35(48)

Опубликована: Июль 29, 2023

Power conversion efficiency (PCE) of organic solar cells (OSCs) processed by nonhalogenated solvents is unsatisfactory due to the unfavorable morphology. Herein, two new small molecule acceptors (SMAs) Y6-Ph and L8-Ph are synthesized introducing a phenyl end group in inner side chains SMAs Y6 L8-BO, respectively, for overcoming excessive aggregation long-time film forming solvents. First, effect time on property photovoltaic performance Y6, Y6-Ph, studied using commonly used solvents: chloroform (CF) (rapid process) chlorobenzene (CB) (slow process). It found that Y6- L8-BO-based OSCs exhibit dramatic drop PCE from CF- CB-processed devices owing large phase separation, while based show obviously increased PCEs Furthermore, L8-Ph-based solvent o-xylene (o-XY) achieved high 18.40% with an FF 80.11%. The results indicate effective strategy modulate morphology improve

Язык: Английский

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Simultaneous Improvements in Efficiency and Stability of Organic Solar Cells via a Symmetric‐Asymmetric Dual‐Acceptor Strategy

Advanced Energy Materials, Год журнала: 2023, Номер 13(20)

Опубликована: Апрель 5, 2023

Abstract Simultaneously achieving improvements in power conversion efficiency (PCE) and stability is the main task of current development stage organic solar cells (OSCs). This work reports a symmetry–asymmetry dual‐acceptor (SADA) strategy to construct ternary devices, which found be feasible for increasing both PCE operational lifetime OSCs. In this contribution, symmetric acceptor L8‐BO asymmetric BTP‐S9 are blended equal proportions with polymer donor PM6 consideration absorption spectrum complementarity cascade energetic alignment. addition, features crystallinity miscibility deliver optimized morphology lead high 18.84%. larger dipole moment shows tighter molecular stacking longer crystal correlation length, favor intrinsic photostability, further consolidate OSCs when coordinated L8‐BO. demonstrates efficacy SADA constructing efficient stable

Язык: Английский

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A-DA′D-A Type Acceptor with a Benzoselenadiazole A′-Unit Enables Efficient Organic Solar Cells

ACS Energy Letters, Год журнала: 2023, Номер 8(6), С. 2488 - 2495

Опубликована: Май 4, 2023

A new A-DA′D-A structured narrow bandgap small molecular acceptor (SMA) Se46 was designed and synthesized by using benzoselenadiazole as the A′ unit branched 2-butyloctyl upper side chains in its DA′D central fused ring. It found that shows red-shifted absorption compared to of L8-BO with a benzothiadiazole an up-shifted lowest unoccupied orbital energy level Y6 linear n-C11H23 chains. The organic solar cells (OSCs) based on PM6:Se46 demonstrate high power conversion efficiency over 18% increased short circuit current density L8-BO-based devices higher open voltage than Y6-based devices. results indicate synergetic modification selenium substitution alkyl chain is effective strategy further promote photovoltaic performance for type acceptors.

Язык: Английский

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Positional Thiophene Isomerization: A Geometric Strategy for Precisely Regulating the Electronic State of Covalent Organic Frameworks to Boost Oxygen Reduction

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(15)

Опубликована: Фев. 13, 2024

Abstract With the oxygen conversion efficiency of metal‐free carbon‐based fuel cells dramatically improved, building blocks covalent organic frameworks (COFs) raised principal concerns on catalytic active sites with indistinct electronic states. Herein, to address this issue, we demonstrate COFs for reduction reaction (ORR) by regulating edge‐hanging thiophene units, and molecular geometries are further modulated via positional isomerization strategy, affording isomeric COF‐α 2‐substitution COF‐β 3‐substitution frameworks. The states intermediate adsorption ability well‐regulated through geometric modification, resulting in controllable chemical activity local density π‐electrons. Notably, introduction units different substitution positions into a pristine pure COF model COF‐Ph achieves excellent half‐wave potential 0.76 V versus reversible hydrogen electrode, which is higher than most those or metal‐based electrocatalysts. Utilizing combination theoretical prediction situ Raman spectra, show that skeleton ( ) can induce dangling unit activation, accurately identifying pentacyclic‐carbon (thiophene α‐position) adjacent sulfur atom as sites. results suggest groups suitable ORR promising geometry construction.

Язык: Английский

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Isomerization of Benzothiadiazole Yields a Promising Polymer Donor and Organic Solar Cells with Efficiency of 19.0%

Advanced Materials, Год журнала: 2024, Номер 36(19)

Опубликована: Фев. 2, 2024

The exploration of high-performance and low-cost wide-bandgap polymer donors remains critical to achieve high-efficiency nonfullerene organic solar cells (OSCs) beyond current thresholds. Herein, the 1,2,3-benzothiadiazole (iBT), which is an isomer 2,1,3-benzothiadiazole (BT), used design donor PiBT. PiBT-based reach efficiency 19.0%, one highest efficiencies in binary OSCs. Systemic studies show that isomerization BT iBT can finely regulate polymers' photoelectric properties including i) increasing extinction coefficient photon harvest, ii) downshifting occupied molecular orbital energy levels, iii) improving coplanarity backbones, iv) offering good thermodynamic miscibility with acceptors. Consequently, PiBT:Y6 bulk heterojunction (BHJ) device simultaneously reaches advantageous nanoscale morphology, efficient exciton generation dissociation, fast charge transportation, suppressed recombination, leading larger VOC 0.87 V, higher JSC 28.2 mA cm-2, greater fill factor 77.3%, thus while analog-PBT-based OSCs only 12.9%. Moreover, key intermediate be easily afforded from industry chemicals via two-step procedure. Overall, this contribution highlights a promising motif for designing donors.

Язык: Английский

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Alkoxy Modification of the Terminal Group in Nonfullerene Acceptors to Achieve Efficient Ternary Organic Solar Cells With a High Open‐Circuit Voltage

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Abstract Y‐series nonfullerene acceptors (NFAs) usually bear halogenated end groups to achieve narrow bandgaps and tunable molecules crystallinity; however, it results in small open‐circuit voltage ( V oc ) of 0.8–0.9 V. Here, three NFAs BTP‐eC9‐G51, BTP‐eC9‐G52, BTP‐eC9‐G53 are synthesized by introducing both an electron‐withdrawing fluoro group electron‐donating alkoxy commonly used 2‐(3‐oxo‐2,3‐dihydroinden1‐ylidene)‐malononitrile (IC) terminal groups. These compounds demonstrate a high larger than 0.9 when employed as organic solar cells (0.91 for BTP‐eC9‐G51 0.95 the others). The effect chain length on photoelectric properties is systematically studied. show that dipole moments aggregation behaviors these changes obviously with increase length. active layer based shows suitable phase separation structure good charge transport. Devices device efficiency 16.65%, higher those BTP‐eC9‐G52 devices (14.33% 13.24%, respectively). Furthermore, introduced into D18:L8‐BO third component, which improves J sc , reduces nonradiation energy loss, increased 19.03% 0.92

Язык: Английский

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