Molecular interaction induced dual fibrils towards organic solar cells with certified efficiency over 20%

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 10, 2024

The nanoscale fibrillar morphology, featuring long-range structural order, provides abundant interfaces for efficient exciton dissociation and high-quality pathways effective charge transport, is a promising morphology high performance organic solar cells. Here, we synthesize thiophene terminated non-fullerene acceptor, L8-ThCl, to induce the fibrillization of both polymer donor host that surpasses 20% efficiency milestone After adding original weak less continuous nanofibrils donors, i.e. PM6 or D18, are well enlarged refined, whilst acceptor L8-BO also assembles into with enhanced order. By adapting layer-by-layer deposition method, order can be retained significantly boost power conversion efficiency, specific values 19.4% 20.1% PM6:L8-ThCl/L8-BO:L8-ThCl D18:L8-ThCl/L8-BO:L8-ThCl devices, latter being certified 20.0%, which highest reported so far single-junction

Language: Английский

---

Achieving 20.8% organic solar cells via additive-assisted layer-by-layer fabrication with bulk p-i-n structure and improved optical management

Joule, Journal Year: 2024, Volume and Issue: 8(11), P. 3153 - 3168

Published: Aug. 29, 2024

Language: Английский

---

Constructing Multiscale Fibrous Morphology to Achieve 20% Efficiency Organic Solar Cells by Mixing High and Low Molecular Weight D18

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(41)

Published: Sept. 1, 2024

This study underscores the significance of precisely manipulating morphology active layer in organic solar cells (OSCs). By blending polymer donors D18 with varying molecular weights, a multiscale interpenetrating fiber network structure within is successfully created. The introduction 10% low weight (LW-D18) into high (HW-D18) produces MIX-D18, which exhibits an extended exciton diffusion distance and orderly stacking. Devices utilizing MIX-D18 demonstrate superior electron hole transport, improves dissociation, enhances charge collection efficiency, reduces trap-assisted recombination compared to other two materials. Through use nonfullerene acceptor L8-BO, remarkable power conversion efficiency (PCE) 20.0% achieved. methodology, integrates favorable attributes polymers, opens new avenue for enhancing performance OSCs.

Language: Английский

---

Isomerization Engineering of Solid Additives Enables Highly Efficient Organic Solar Cells via Manipulating Molecular Stacking and Aggregation of Active Layer

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(33)

Published: June 20, 2024

Morphology control is crucial in achieving high-performance organic solar cells (OSCs) and remains a major challenge the field of OSC. Solid additive an effective strategy to fine-tune morphology, however, mechanism underlying isomeric solid additives on blend morphology OSC performance still vague urgently requires further investigation. Herein, two based pyridazine or pyrimidine as core units, M1 M2, are designed synthesized explore working OSCs. The smaller steric hindrance larger dipole moment facilitate better π-π stacking aggregation M1-based active layer. M1-treated all-small-molecule OSCs (ASM OSCs) obtain impressive efficiency 17.57%, ranking among highest values for binary ASM OSCs, with 16.70% M2-treated counterparts. Moreover, it imperative investigate whether isomerization engineering works state-of-the-art polymer D18-Cl:PM6:L8-BO-based devices achieve exceptional 19.70% (certified 19.34%), work provides deep insights into design clarifies potential optimizing device through additives.

Language: Английский

---

Approaching 20% Efficiency in Ortho‐Xylene Processed Organic Solar Cells by a Benzo[a]phenazine‐Core‐Based 3D Network Acceptor with Large Electronic Coupling and Long Exciton Diffusion Length

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(41)

Published: Aug. 13, 2024

Abstract High‐performance organic solar cells often rely on halogen‐containing solvents, which restrict the photovoltaic industry. Therefore, it is imperative to develop efficient materials compatible with halogen‐free solvents. Herein, a series of benzo[ ]phenazine (BP)‐core‐based small‐molecule acceptors (SMAs) achieved through an isomerization chlorination strategy presented, comprising unchlorinated NA1, 10‐chlorine substituted NA2, 8‐chlorine NA3, and 7‐chlorine NA4. Theoretical simulations highlight NA3's superior orbit overlap length tight molecular packing, attributed interactions between end group BP unit. Furthermore, NA3 demonstrates dense 3D network structures record electronic coupling 104.5 meV. These characteristics empower ortho‐xylene ( o ‐XY) processed PM6:NA3 device power conversion efficiency (PCE) 18.94%, surpassing PM6:NA1 (15.34%), PM6:NA2 (7.18%), PM6:NA4 (16.02%). Notably, significantly lower PCE in excessive self‐aggregation NA2 ‐XY. Importantly, incorporation D18‐Cl into binary blend enhances crystallographic ordering increases exciton diffusion donor phase, resulting ternary 19.75% (certified as 19.39%). findings underscore significance incorporating new electron‐deficient units design SMAs tailored for environmentally benign solvent processing OSCs.

Language: Английский

---

Room-temperature-modulated polymorphism of nonfullerene acceptors enables efficient bilayer organic solar cells

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(15), P. 5666 - 5678

Published: Jan. 1, 2024

Polymorphism of nonfullerene acceptors enhances electron transport properties and potentially impacts the performance organic electronic devices.

Language: Английский

---

Achieving 19.78%‐Efficiency Organic Solar Cells by 2D/1A Ternary Blend Strategy with Reduced Non‐Radiative Energy Loss

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: June 2, 2024

Abstract Reducing non‐radiative energy loss (∆ E nr ) is critical for enhancing the photovoltaic performance of organic solar cells (OSCs). To achieve this, a small molecular donor, LJ1, introduced as third component in host system D: A (D18: BTP‐eC9‐4F). The cascade‐like level alignment D18, and BTP‐eC9‐4F facilitates efficient charge transfer. LJ1's good solubility processing solvent high miscibility with delay precipitation BTP‐eC9‐4F, leading to improved phase morphology blend films. Additionally, LJ1 increases spacing between polymer donor (PD) molecule acceptor (SMA), optimizing film reducing OSCs. Ternary OSCs based on D18:LJ1:BTP‐eC9‐4F power conversion efficiency (PCE) 19.43% reduced ∆ . Notably, ternary device using D18:LJ1:L8‐BO attains an outstanding PCE 19.78%, which one highest OSC. work highlights effectiveness strategy OSC while minimizing

Language: Английский

---

Recent Advances in Polymorphism of Organic Solar Cells

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 13, 2025

Abstract As organic solar cells (OSCs) achieve notable advancements, a significant consensus has been highlighted that the device performance is intricately linked to active layer morphology. With conjugated molecules being widely employed, intermolecular interactions exert substantial influence over aggregation state and morphology formation, resulting in distinct molecular packing motifs, also known as polymorphism. This phenomenon closely associated with processing conditions exerts profound impact on functional properties. Consequently, understanding mechanisms underlying polymorphism formation establishing definitive correlation between photophysical behavior crucial for driving high‐performance OSCs. In this review, comprehensive synthesis of recent developments provided emphasizing its pivotal role field OSC The thermodynamic kinetic principles governing are examined. Then, representative polymorphisms classified materials, segmenting them into homopolymers, copolymers, IDTT‐ BTP‐based small molecules. Additionally, prevalent strategies evaluated manipulating review culminates an analysis critical effects OSCs, including charge carrier characteristics, photovoltaic efficiency, long‐term stability. By offering novel perspectives practical insights, work seeks guide future efforts morphological optimization high‐efficiency

Language: Английский

---

Exploring the Impact of Structural Modifications of Phenothiazine-Based Novel Compounds for Organic Solar Cells: DFT Investigations

Polymers, Journal Year: 2025, Volume and Issue: 17(1), P. 115 - 115

Published: Jan. 5, 2025

This paper explores a novel group of D-π-A configurations that has been specifically created for organic solar cell applications. In these material compounds, the phenothiazine, furan, and two derivatives thienyl-fused IC act as donor, π-conjugated spacer, end-group acceptors, respectively. We assess impact substituents by introducing bromine atoms at potential substitution sites on each acceptor (EG1 EG2). With donor π-bridge held constant, we have employed density functional theory time-dependent DFT simulations to explore photophysical optoelectronic properties tailored compounds (M1–M6). demonstrated how structural modifications influence materials cells. Moreover, all proposed exhibit greater Voc exceeding 1.5 V, suitable HOMO-LUMO energy gap (2.14–2.30 eV), higher dipole moments (9.23–10.90 D). Various decisive key factors are crucial exploring compounds—frontier molecular orbitals, transition matrix, electrostatic potential, open-circuit voltage, maximum absorption, reduced gradient, charge transfer length (Dindex)—were also explored. Our analysis delivers profound insights into design principles optimizing performance applications based halogenated compounds.

Language: Английский

---

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, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 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

Language: Английский

---