Time-Dependent Mechanical Properties of Bulk Heterojunction Films in Organic Solar Cells DOI
Shiqi Hu, Zezhou Liang, Tian Zhong

et al.

Macromolecules, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 8, 2024

The mechanical properties of bulk heterojunction (BHJ) films play critical roles in the operational stability organic solar cells (OSCs) real-world applications. While existing literature extensively explores static characteristics BHJ films, time-dependent are largely overlooked despite their significance addressing temporal stresses encountered during practical use. To address this gap, representative prepared, and reported. It is demonstrated that regardless whether they subjected to tensile or compressive stress, based on PC71BM, Y6, PYF-T-o decreases gradually, all-polymer-based have lower durability than small molecule fullerene acceptors. Furthermore, impacts continuous tension acceptor aggregation stacking meticulously studied, evidencing stress modifies degree through a relative displacement molecules within films. Additionally, carrier dynamics studies show lifetimes carriers extended following application tension. This work raises awareness OSCs provides important insights into development novel flexible OSC materials device fabrication processes.

Language: Английский

Mechanically robust and stretchable organic solar cells plasticized by small-molecule acceptors DOI
Zhenye Wang, Di Zhang, Lvpeng Yang

et al.

Science, Journal Year: 2025, Volume and Issue: 387(6732), P. 381 - 387

Published: Jan. 23, 2025

Emerging wearable devices would benefit from integrating ductile photovoltaic light-harvesting power sources. In this work, we report a small-molecule acceptor (SMA), also known as non–fullerene (NFA), designed for stretchable organic solar cell ( s -OSC) blends with large mechanical compliance and performance. Blends of the organosilane-functionalized SMA BTP-Si4 polymer donor PNTB6-Cl achieved conversion efficiency (PCE) >16% ultimate strain (ε u ) >95%. Typical SMAs suppress OSC blend ductility, but addition enhances it. Although is less crystalline than other SMAs, it retains considerable electron mobility highly miscible essential enhancing ε . Thus, -OSCs PCE > 14% operating normally under various deformations (>80% retention an 80% strain) were demonstrated. Analysis several SMA-polymer revealed general molecular structure–miscibility–stretchability relationships designing blends.

Language: Английский

Citations

8
Binary Organic Solar Cells with Exceeding 19% Efficiency via the Synergy of Polyfluoride Polymer and Fluorous Solvent DOI
Zhilong He, Siyuan Li, Rui Zeng

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(30)

Published: May 11, 2024

Rational molecular design and suitable device engineering are two important strategies to boost the efficiencies in organic solar cells (OSCs). Yet these approaches independently developed, while their synergy is believed be more productive. Herein, a branched polyfluoride moiety, heptafluoroisopropoxyl group, introduced into side chains of conjugated polymers for first time. Compared with conventional alkyl chain, this chain can endow resulting polymer namely PF7 highly packing order strong crystallinity owing polarization fluorine-induced interactions, good solubility moderate miscibility retained. As result, comprehensively outperforms state-of-the-art PM6 photovoltaic properties. More importantly, based on groups fluorous solvents, new post-treatment denoted as solvent vapor annealing (FSVA) proposed match PF7. Differing from existing post-treatments, FSVA selectively reorganize fluoropolymer molecules but less impact small blend films. By employing solvent, achieves remarkable efficiency 19.09%, which among best binary OSCs. The treatment exhibit excellent universality various OSCs different material combinations or architectures.

Language: Английский

Citations

14
Boosting the Mechanical Stability and Power Output of Intrinsically Stretchable Organic Photovoltaics with Stretchable Electron Transporting Layer DOI Creative Commons

Yurim Bae,

Sang Ah Park, Sungryong Kim

et al.

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract Intrinsically stretchable organic photovoltaics (IS‐OPVs) are emerging as power sources for wearable technologies, enabling seamless integration into flexible and systems. A key feature of IS‐OPVs is the potential increased output photoactive area expands during stretching. However, current mechanical performance stability still fall short meeting demands practical applications. To overcome this limitation, study introduces, first time, a polymer:gel blend system highly electron transporting layer (ETL), which significantly enhances both IS‐OPVs. This novel ETL plays pivotal role in dissipating stress protecting brittle underlying layers. By incorporating ETL, device stretchability reinforced by introducing thereby maintaining initial conversion efficiency under 20% strain. As result, maximum substantially increases 23%, from 0.28 to 0.35 mW, large strain, while devices with conventionally ETLs caused 33% reduction output. thus offers pathway toward durable efficient photovoltaics.

Language: Английский

Citations

2
Intrinsically Stretchable Organic Solar Cells and Sensors Enabled by Extensible Composite Electrodes DOI
Dexia Han, Kangkang Zhou, Xin Li

et al.

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

Published: Aug. 7, 2024

Abstract Stretchable electrodes are critical to the development of advanced technologies such as human–machine interaction, flexible sensing, and wearable power supply, making them significant research value. However, current preparation methods for high‐performance stretchable complex inefficient, posing challenges their large‐scale application in realm wearables. To address this need, a straightforward efficient embedding strategy is reported fabricating silver nanowire/thermoplastic elastomer composite (referred Strem‐AT) utilizing viscoelasticity outstanding mechanical properties polymer elastomers achieve extensibility, conductivity, smooth surface. These exhibit excellent tensile behavior, low surface roughness, stable electrical properties, enabling successful integration into sensors intrinsically organic photovoltaic cells (IS‐OPV). When applied human skin joints motion detection, sensor demonstrates remarkable stretchability signal output. Importantly, all‐polymer IS‐OPV exhibits top‐notch conversion efficiency (PCE) >12.5% PCE 80% strain exceeding 50%. Furthermore, even after subjecting high‐strain stretching at 50% 1000 cycles, can retain 76% initial PCE. This study presents multifunctional electrode with high repeatability easy‐to‐scale fabrication photovoltaics.

Language: Английский

Citations

9
High-efficiency ultrathin flexible organic solar cells with a bilayer hole transport layer DOI
Dongyang Zhang, Yitong Ji, Yingying Cheng

et al.

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(25), P. 15099 - 15105

Published: Jan. 1, 2024

We have successfully demonstrated ultrathin flexible organic solar cells (with a total thickness of less than 1.5 μm) based on MoO 3 /PEDOT:PSS bilayer HTL, achieving PCE 17.0% and power-per-weight ratio 39.3 W g −1 .

Language: Английский

Citations

7
Advancing Intrinsically Stretchable Organic Photovoltaics with a Nearly Amorphous Polymer Semiconductor DOI
L. Z. Pei, Dexia Han, Yuxuan Wang

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Abstract Current state‐of‐the‐art organic photovoltaic (OPV) films, composed of conjugated polymer donors and small molecule acceptors, are often limited by the high brittleness their rigid backbones, which restricts application in wearable devices. In contrast, all‐polymer OPVs have demonstrated enhanced intrinsic stretchability, but further advancements necessary to meet demands. Here, an uncharted strategy is reported enhance mechanical stretchability performance incorporating a nearly‐amorphous polymer, poly(indacenodithiophene‐co‐benzothiadiazole) (IDTBT) into layer‐by‐layer structured active layer. IDTBT possesses fracture strain ≈80%, significantly outperforming well‐known donor polymers like PM6. The incorporation enhances properties, with both optimized at low contents. More importantly, intrinsically stretchable demonstrate superior stability impressive power conversion efficiency 14.2%, highest date this category. Particularly, IDTBT‐strengthened retain 72% initial under tensile 50%, 68% even after being stretched hundreds times 30% strain, demonstrating exceptional stability. This approach underscores potential semiconductors designing highly OPVs, paving way for seamless integration electronics.

Language: Английский

Citations

1
Stability of Intrinsically Stretchable Polymer Photovoltaics: Fundamentals, Achievements, and Perspectives DOI

Yurim Bae,

Dohyun Kim, Saimeng Li

et al.

Progress in Polymer Science, Journal Year: 2024, Volume and Issue: unknown, P. 101899 - 101899

Published: Oct. 1, 2024

Language: Английский

Citations

6
Toward Flexible and Stretchable Organic Solar Cells: A Comprehensive Review of Transparent Conductive Electrodes, Photoactive Materials, and Device Performance DOI Open Access
Yong Yan,

Bowen Duan,

Min Ru

et al.

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 10, 2024

Abstract Flexible and stretchable organic solar cells (FOSCs SOSCs) hold immense potential due to their versatility applicability in emerging areas such as wearable electronics, foldable devices, biointegrated systems. Despite these promising applications, several challenges remain, primarily related the mechanical durability, material performance, scalability required for commercialization. This review comprehensively highlights recent advancements design fabrication of FOSCs SOSCs, with a particular emphasis on key functional layers, including transparent conductive electrodes, interfacial photoactive materials, top electrodes. Innovations design, active layers electrodes improved flexibility, are discussed alongside developments device processes achieve power conversion efficiencies exceeding 19%. Furthermore, addresses remaining challenges, need scalable manufacturing techniques enhanced robustness under strain. Finally, prospects SOSCs analyzed, providing insights into how technologies can contribute development sustainable, high‐performance sources electronic devices other flexible electronics. offers valuable insights, bringing commercialization wearable, closer reality.

Language: Английский

Citations

6
Effect of Molecular Conformation on Intermolecular Interactions and Photovoltaic Performances of Giant Molecule Acceptors DOI Open Access

Hongmei Zhuo,

Xiaojun Li, Shucheng Qin

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 5, 2024

Abstract The molecular conformation of giant molecule acceptors (GMAs) plays a significant role in regulating the intermolecular interactions and their photovoltaic performances organic solar cells (OSCs). For linear GMA GT‐l, stronger homo‐molecular interaction causes its aggregation being weakly affected by donor, thus forming an ordered stacking proper phase separation blend film. star‐shaped GT‐s‐based film shows dominant hetero‐molecular that suppresses donor acceptor, resulting smaller more uniform vertical distribution. While for another GTs, weakest to form larger separation. Therefore, GT‐l based OSC with PM6 as highest charge mobilities, fastest transfer (CT) process, reduced energy loss less recombination, contributing higher power conversion efficiency (PCE) 19.03%. Comparatively, PCEs OSCs on GTs GT‐s are 18.05% 17.58% respectively. Notably, all three GMAs show excellent thermal stability long‐term storage stability. This study provides facile strategy tuning linking unit connecting mode designing highly efficient stable materials.

Language: Английский

Citations

4
Linkage Regulation of Back‐To‐Back Connected Dimers as Guest Acceptors Enables Organic Solar Cells with Excellent Efficiency, Stability and Flexibility DOI

Shiyong You,

Youhui Zhang, Bin Huang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 18, 2024

Abstract High efficiency, stability, and flexibility are key prerequisites for the commercial applications of organic solar cells (OSCs). Herein, three back‐to‐back connected dimers (2Qx‐TT, 2Qx‐C3, 2Qx‐C6) developed as guest acceptors OSCs with improved comprehensive performance. By regulating linkage from rigid bithiophene to flexible alkyl chain, display quite different molecular geometry intermolecular interactions, consequently influencing their packing arrangement, film‐forming process, carrier mobilities, device flexibility. introducing these dimer into active layer, form alloy phases host acceptor, promoting process charge dynamics. All ternary devices exhibit PCEs over 18% than control binary device. Among them, 2Qx‐C3‐based obtains best efficiency high 19.03%. Moreover, thanks stronger entanglement favored by linkage, PM6:BTP‐eC9:2Qx‐C3‐based shows outstanding stability The displays an PCE 16.09% a crack‐onset strain 15.0%, showing excellent mechanical robustness close all‐polymer devices. This work demonstrates potential highly efficient, stable OSCs.

Language: Английский

Citations

4