Non-covalent interactions in conjugated polymer blends: Insights into the stability of PVC/PM6 and CPE/PM6 systems DOI
R. Sewak, Rudranarayan Khatua, Anirban Mondal

et al.

The Journal of Chemical Physics, Journal Year: 2024, Volume and Issue: 161(21)

Published: Dec. 3, 2024

This study investigates the role of non-covalent interactions (NCIs) in stabilizing blends conjugated polymer PM6 with additives polyvinyl chloride (PVC) and chlorinated polyethylene (CPE). Using NCI index, reduced density gradient analysis, energy decomposition analysis (EDA), we quantify contributions van der Waals forces, hydrogen bonding, steric repulsions these systems. Our results reveal that PVC/PM6 exhibit stronger NCI, particularly C–H⋯π C–Cl⋯π interactions, compared to CPE/PM6 blends. EDA further shows dispersion forces electrostatic are primary factors PVC blend, bonding also playing a critical role. These findings highlight importance chlorine content enhancing promoting stability The insights from this work provide valuable guidance for designing more stable polymer-additive systems organic electronics other material applications.

Language: Английский

Over 19.2% Efficiency of Layer‐By‐Layer Organic Photovoltaics by Ameliorating Exciton Dissociation and Charge Transport DOI Open Access

Hongyue Tian,

Hang Zhou, Lu Zhang

et al.

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

Published: Jan. 26, 2025

Abstract Layer‐by‐layer (LbL) organic photovoltaics (OPVs) are fabricated with polymer PM1 as donor and small molecule L8‐BO acceptor by employing sequential spin‐coating technology. The BTP‐eC9 PTAA deliberately selected for individually incorporating into layer layer, resulting in the power conversion efficiency (PCE) increased from 18.22% to 19.23%. improvement of performance is attributed synergistically short circuit current density ( J SC ) 27.78 mA cm −2 fill factor (FF) 78.23%. introduction can promote photogenerated exciton dissociation, especially excitons near anode. Meanwhile, molecular crystallinity also enhanced appropriate layer. incorporation provide hole transport channels effectively improve holes generated self‐dissociation L8‐BO, FFs 77.40% synergistic effects layers result a 19.23% PCE optimized LbL‐OPVs. This work demonstrates that there great room hierarchically optimize achieving highly efficient

Language: Английский

Citations

3
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

2
Dynamic hydrogen-bonding enables high-performance and mechanically robust organic solar cells processed with non-halogenated solvent DOI Creative Commons
Haozhe He, Xiaojun Li, Jingyuan Zhang

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 17, 2025

Developing active-layer systems with both high performance and mechanical robustness is a crucial step towards achieving future commercialization of flexible stretchable organic solar cells (OSCs). Herein, we design synthesize series acceptors BTA-C6, BTA-E3, BTA-E6, BTA-E9, featuring the side chains hexyl, 3, 6, 9 carbon-chain ethyl ester end groups respectively. Benefiting from suitable phase separation vertical distribution, PM6:BTA-E3-based OSCs processed by o-xylene exhibit lower energy loss improved charge transport characteristic achieve power conversion efficiency 19.92% (certified 19.57%), which stands as highest recorded value in binary green solvents. Moreover, due to additional hydrogen-bonding provided chain, enhanced stretchability thermal stability. Our work reveals significance dynamic improving photovoltaic performance, robustness, morphological stability OSCs.

Language: Английский

Citations

1
Composite side chain induced ordered preaggregation in liquid state for high-performance non-halogen solvent processed organic solar cells DOI
Tianyu Hu, Xufan Zheng, Cong Xiao

et al.

Nano Energy, Journal Year: 2024, Volume and Issue: 130, P. 110172 - 110172

Published: Aug. 23, 2024

Language: Английский

Citations

4
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

4
Steric hindrance induced low exciton binding energy enables low‐driving‐force organic solar cells DOI Creative Commons
Tianyu Hu, Xufan Zheng, Ting Wang

et al.

Aggregate, Journal Year: 2024, Volume and Issue: 5(5)

Published: July 2, 2024

Abstract Exciton binding energy ( E b ) has been regarded as a critical parameter in charge separation during photovoltaic conversion. Minimizing the of materials can facilitate exciton dissociation low‐driving force organic solar cells (OSCs) and thus improve power conversion efficiency (PCE); nevertheless, diminishing with deliberate design principles remains significant challenge. Herein, bulky side chain steric hindrance structure was inserted into Y‐series acceptors to minimize by modulating intra‐ intermolecular interaction. Theoretical experimental results indicate that hindrance‐induced optimal interaction enhance molecular polarizability, promote electronic orbital overlap between molecules, delocalized transfer pathways, thereby resulting low . The conspicuously reduced obtained Y‐ChC5 pinpoint modulation detrimental effects on low‐driving‐force OSCs, achieving remarkable PCE 19.1% over 95% internal quantum efficiency. Our study provides new rationale reduce

Language: Английский

Citations

3
Enhancing the Thermal Stability of Organic Solar Cells by Locking Morphology with Ethyl Cellulose Additive DOI Open Access
Zhaochen Suo,

Xiaodong Si,

Wenkai Zhao

et al.

Solar RRL, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

The morphology of active layer the organic solar cells (OSCs) tends to transition toward its lowest energy conformation under thermal stress, significantly limiting stability OSCs. In this study, ethyl cellulose (EC) is utilized as an additive in typical PM6:Y6 and other systems. Due strong interaction between hydroxyl groups EC heteroatoms semiconductors, their bulk heterojunction nanomorphology locked, thereby enhancing device stability. Under stress at 65 °C for 1,000 h, incorporating demonstrates excellent nearly without performance loss. Furthermore, compared control device, exhibits improved a range more stringent aging conditions. Additionally, shows broad applicability various systems, effectively This work offers promising approach developing stable structures

Language: Английский

Citations

0
Interlayer enhancement of organic solar cells efficiency DOI
Yuanyuan Zhou,

Yaohua Shi,

Miao Li

et al.

Dyes and Pigments, Journal Year: 2025, Volume and Issue: 239, P. 112738 - 112738

Published: March 6, 2025

Language: Английский

Citations

0
A Strain Relaxation Modulation for Printing High‐performance Flexible Pseudo‐Planar Heterojunction Organic Solar Cells DOI Open Access
Rui Gong,

Qing Yan,

Zhi Xing

et al.

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

Published: March 26, 2025

The rational toughening of photosensitive films is crucial for the development robust and flexible organic solar cells (F-OSCs), which are always influenced by mechanical strain thermodynamic relaxation within films. Nevertheless, potential determinants these properties quantitative metrics modulating overall performance devices have not been thoroughly defined. Herein, a fine-grain strengthening strategy demonstrated mitigating excessive aggregation or crystallization in small-molecule acceptor films, secondary thermal side chains polyethylene oxide (PEO) local motion restricts free fluctuation volume through hydrogen-bonding interactions, thereby suppressing non-ideal behavior residual-enriched state. These contribute to an increase yield strength reduction microcracks while enhancing fracture energy at donor/acceptor interface. Finally, optimal F-OSCs demonstrate champion PCEs 19.12% (0.04 cm2) 16.92% (1.00 cm2), maintain 80% their initial efficiency after heating 85 °C 2600 h. Besides, flexibility robustness also optimized, elastic modulus stiffness decreased 50.68% 5.71%. This work provides interesting references synergistic enhancement efficiency, environmental stability photovoltaics.

Language: Английский

Citations

0
Exceeding 2.2 V Open‐Circuit Voltage in Perovskite/Organic Tandem Solar Cells via Multi‐Functional Hole‐Selective Layer DOI

Jung Geon Son,

Shahid Ameen,

Jina Roe

et al.

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

Published: April 8, 2025

Abstract Perovskite/organic tandem solar cells (POTSCs) are promising candidates for surpassing the Shockley‐Queisser limit through reduction of thermalization losses. However, wide bandgap perovskite (WBG PSCs), which function as top POTSCs, still suffer from significant open‐circuit voltage ( V OC ) losses, limiting efficiency improvement POTSCs. Here, a multi‐functional hole‐selective layer (mHSL) is reported via blending two functionalized self‐assembled monolayer (SAM) molecules: (4‐(3,6‐diiodo‐9 H ‐carbazol‐9‐yl)butyl)phosphonic acid (36ICzC4PA) and (4‐(3,6‐dimethoxy‐9 (36MeOCzC4PA). The molecules plays multiple roles: i) Suppressing micelle formation SAM molecules, ii) optimizing energy level alignment with homogeneous highly covered SAMs, iii) enhancing crystallinity orientation interaction materials, iv) suppressing both lattice strain phase segregation. Implementing mHSL on WBG PSCs enables power conversion (PCE) 18.85% notable 1.366 V. When integrated into PCE reached 24.73% (certified 24.19%) record‐high fill factor FF 2.216 84.07%, respectively. Furthermore, POTSCs exhibit excellent photo‐ thermal stabilities, retaining ≈80% their initial PCEs after maximum point (MPP) tracking under 1‐sun illumination in ambient conditions 305 h or exposure to 65 °C N 2 500 h.

Language: Английский

Citations

0