Improved photovoltaic performance and robustness of all-polymer solar cells enabled by a polyfullerene guest acceptor

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: April 22, 2023

Abstract Fullerene acceptors typically possess excellent electron-transporting properties and can work as guest components in ternary organic solar cells to enhance the charge extraction efficiencies. However, conventional fullerene small molecules suffer from undesirable segregation dimerization, thus limiting their applications cells. Herein we report use of a poly(fullerene- alt -xylene) acceptor (PFBO-C12) component enables significant efficiency increase 16.9% for binary 18.0% all-polymer Ultrafast optic optoelectronic studies unveil that PFBO-C12 facilitate hole transfer suppress recombination. Morphological investigations show blends maintain favorable morphology with high crystallinity smaller domain size. Meanwhile, introduction reduces voltage loss light stability mechanical durability flexible devices. This demonstrates introducing polyfullerenes is an effective approach achieving highly efficient good robustness.

Language: Английский

---

A rare case of brominated small molecule acceptors for high-efficiency organic solar cells

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Aug. 5, 2023

Abstract Given that bromine possesses similar properties but extra merits of easily synthesizing and polarizing comparing to homomorphic fluorine chlorine, it is quite surprising very rare high-performance brominated small molecule acceptors have been reported. This may be caused by undesirable film morphologies stemming from relatively larger steric hindrance excessive crystallinity bromides. To maximize the advantages bromides while circumventing weaknesses, three (CH20, CH21 CH22) are constructed with stepwise brominating on central units rather than conventional end groups, thus enhancing intermolecular packing, dielectric constant them without damaging favorable packing through groups. Consequently, PM6:CH22-based binary organic solar cells render highest efficiency 19.06% for acceptors, more excitingly, a record-breaking 15.70% when further thickening active layers ~500 nm. By exhibiting such acceptor, our work highlights great potential achieving delicately brominating.

Language: Английский

---

Over 19 % Efficiency Organic Solar Cells Enabled by Manipulating the Intermolecular Interactions through Side Chain Fluorine Functionalization

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(15)

Published: Feb. 8, 2024

Fluorine side chain functionalization of non-fullerene acceptors (NFAs) represents an effective strategy for enhancing the performance organic solar cells (OSCs). However, a knowledge gap persists regarding relationship between structural changes induced by fluorine and resultant impact on device performance. In this work, varying amounts atoms were introduced into outer chains Y-series NFAs to construct two named BTP-F0 BTP-F5. Theoretical experimental investigations reveal that side-chain fluorination significantly increase overall average electrostatic potential (ESP) charge balance factor, thereby effectively improving ESP-induced intermolecular interaction, thus precisely tuning molecular packing bulk-heterojunction morphology. Therefore, BTP-F5-based OSC exhibited enhanced crystallinity, domain purity, reduced spacing, optimized phase distribution in vertical direction. This facilitates exciton diffusion, suppresses recombination, improves extraction. Consequently, promising power conversion efficiency (PCE) 17.3 % 19.2 achieved binary ternary devices, respectively, surpassing PCE 16.1 BTP-F0-based OSCs. work establishes structure-performance demonstrates is compelling achieving ideal separation highly efficient

Language: Английский

---

Oligothiophene Additive‐Assisted Morphology Control and Recombination Suppression Enable High‐Performance Organic Solar Cells

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(11)

Published: Jan. 9, 2024

Abstract Tuning the morphology through processing additives represents one of most promising strategies to boost performance organic solar cells (OSCs). However, it remains unclear how oligothiophene‐based solid influence molecular packing and OSCs. Here, two namely 2T 4T, are introduced into state‐of‐the‐art PM6:Y6‐based OSCs understand they film formation process, nanoscale morphology, photovoltaic performance. It is found that additive can improve both donor polymer non‐fullerene acceptor, resulting in lower Urbach energy reduced loss. Furthermore, blend with treatment displays enhanced domain purity a more favorable distribution acceptor materials vertical direction, which enhance charge extraction efficiency while simultaneously suppressing recombination. Consequently, processed realize 18.1% for devices. general applicability demonstrated, an impressive 18.6% PM6:L8‐BO‐based achieved. These findings highlight uncomplicated oligothiophenes have excellent potential fine‐adjustment active layer crucial future development

Language: Английский

---

An efficient alkoxy-substituted polymer acceptor for efficient all-polymer solar cells with low voltage loss and versatile photovoltaic applications

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(14), P. 5191 - 5199

Published: Jan. 1, 2024

All-polymer solar cells with low voltage loss for efficient outdoor and indoor photovoltaics.

Language: Английский

---

A polymer acceptor with double-decker configuration enhances molecular packing for high-performance all-polymer solar cells

Joule, Journal Year: 2024, Volume and Issue: 8(8), P. 2304 - 2324

Published: July 9, 2024

Language: Английский

---

Tailoring Cyano Substitutions on Quinoxaline‐based Small‐Molecule Acceptors Enabling Enhanced Molecular Packing for High‐Performance Organic Solar Cells

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(30)

Published: May 11, 2024

Abstract Cyanation is a common chemical modification strategy to fine‐tune the energy levels and molecular packing of organic semiconductors, especially materials used in solar cells (OSCs). Generally, cyanation modify end groups high‐performance small‐molecule acceptors (SMAs). However, has not been investigated on central backbone SMAs, which could introduce stronger intermolecular interaction enhance π–π stacking for rapid charge transport. This paper, first time, reports new benzo‐quinoxaline core synthesizes two novel A‐DA'D‐A type named BQx‐CN BQx‐2CN, with mono‐ di‐cyanide groups, respectively. Through tailoring number CN BQx‐CN‐based OSC exhibits best device performance 18.8%, significantly higher than non‐cyano BQx‐based one. The reason superior devices can be attributed fine‐tuned level, packing, ideal phase segregation, lead exciton dissociation, faster transport, suppressed recombination, therefore highest fill factor (FF) power conversion efficiencies (PCE). research demonstrates effectiveness SMAs enhanced better OSCs.

Language: Английский

---

Precisely Controlling Polymer Acceptors with Weak Intramolecular Charge Transfer Effect and Superior Coplanarity for Efficient Indoor All‐Polymer Solar Cells with over 27% Efficiency

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(32)

Published: May 28, 2024

Abstract Indoor photovoltaics (IPVs) are garnering increasing attention from both the academic and industrial communities due to pressing demand of ecosystem Internet‐of‐Things. All‐polymer solar cells (all‐PSCs), emerging as a sub‐type organic photovoltaics, with merits great film‐forming properties, remarkable morphological light stability, hold promise simultaneously achieve high efficiency long‐term operation in IPV's application. However, dearth polymer acceptors medium‐bandgap has impeded rapid development indoor all‐PSCs. Herein, highly efficient acceptor (PYFO‐V) is reported through synergistic effects side chain engineering linkage modulation applied for all‐PSCs operation. As result, PM6:PYFO‐V‐based all‐PSC yields highest 27.1% under LED condition, marking value binary date. More importantly, blade‐coated devices using non‐halogenated solvent ( o ‐xylene) maintain an over 23%, demonstrating potential industry‐scale fabrication. This work not only highlights importance fine‐tuning intramolecular charge transfer effect intrachain coplanarity developing high‐performance but also provides strategy

Language: Английский

---

Strengthening Near‐Infrared Photon Harvesting in Semi‐Transparent All‐Polymer Solar Cells through the Synergy of Fluorination on the Selenide Monomer Backbone

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(33)

Published: April 26, 2024

Abstract All‐polymer solar cells (all‐PSCs) offer promising potential for large‐scale manufacturing due to their remarkable mechanical and thermal stability. However, the limited capacity of polymer acceptors near‐infrared (NIR) photon harvesting has impeded progress in semi‐transparent (ST) all‐PSCs. Here, study develops a pair new NIR acceptors, named PYSeF‐T PYSe2F‐T, with mono‐/di‐fluorinated end groups capped selenide monomer backbone, respectively. Owing stronger intermolecular interaction intramolecular charge transfer effect di‐fluorinated PYSe2F‐T exhibits crystallinity more bathochromic absorption 1000 nm. When blended donor, PM6, PY2SeF‐T‐based all‐PSC demonstrates higher efficiency 16.73% short‐circuit current ( J SC ) 27.7 mA cm −2 , which is highest Based on these, ST device based PM6:PYSe2F‐T superior 12.52% an average visible transmittance 26.2% light utilization 3.28%, outperforming mono‐fluorinated counterpart. The work provides in‐depth understanding above synergistic effects develop establishes solid foundation future investigations into large‐area flexible

Language: Английский

---

Coplanar Dimeric Acceptors with Bathochromic Absorption and Torsion‐Free Backbones through Precise Fluorination Enabling Efficient Organic Photovoltaics with 18.63% Efficiency

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

Abstract Giant dimeric acceptors (GDAs), a sub‐type of acceptor materials for organic solar cells (OSCs), have garnered much attention due to the synergistic advantages their monomeric and polymeric acceptors, forming well‐defined molecular structure with giant weight high efficiency stability. In this study, first time, two new GDAs, DYF‐V DY2F‐V are designed synthesized OSC operation, by connecting one vinylene linker mono‐/di‐fluorinated end group on Y‐series monomers, respectively. After fluorination, both exhibit bathochromic absorption denser packing modes stronger intramolecular charge transfer effect torsion‐free backbones. Through precise DYF‐V‐based devices highest performance 18.63% among GDA‐based OSCs, outperforming its non‐fluorinated counterpart, DY‐V‐based ones (16.53%). Theoretical morphological results demonstrate that proper fluorination in strengthens intra/intermolecular interactions enhanced crystallinity, superior phase segregation, less energy disorder, which is beneficial fast exciton dissociation, rapid carrier transport, suppressed recombination. The work demonstrates GDAs rigid coplanar backbones effective broader photon harvesting, packing, robust stability OSCs.

Language: Английский

---