Extending Exciton Diffusion Length via an Organic‐Metal Platinum Complex Additive for High‐Performance Thick‐Film Organic Solar Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 6, 2025

The long exciton diffusion length (LD) plays an important role in promoting dissociation, suppressing charge recombination, and improving the transport process, thereby performance of organic solar cells (OSCs), especially thick-film OSCs. However, limited LD hinders further improvement device as film thickness increases. Here, organic-metal platinum complex, namely TTz-Pt, is synthesized served a solid additive into D18-Cl:L8-BO system. addition TTz-Pt enhanced crystallinity blends, reduced energy disorder, trap density, decreased non-radiative recombination binding energy, which conducive to prolonging TTz-Pt-treated film, facilitating dissociation process along with inhibiting recombination. Consequently, D18:L8-BO:IDIC (100 nm) exhibits champion power conversion efficiency (PCE) 20.12% (certified 19.54%), one highest PCEs reported for OSCs date. Remarkably, record-breaking PCE 18.84% yielded active layer 300 nm. Furthermore, superior universality This work provides simple universal approach extending by introducing complex achieve highly efficient

Язык: Английский

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Pressure‐Controlled Nanoimprint Lithography Achieves over 20% Efficiency in Organic Solar Cells

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 9, 2025

Abstract Nanoimprint lithography (NIL) offers unprecedented control over active layer morphology in organic solar cells (OSCs), yet optimal processing conditions remain critical for maximizing device performance. Here, pressure‐dependent NIL fabrication of ordered interdigitated heterojunction structures is demonstrated D18/L8‐BO‐based OSCs, achieving exceptional performance through systematic pressure optimization. At an 50 bar, devices exhibit record‐setting metrics: 20.08% power conversion efficiency, 27.34 mA cm −2 short‐circuit current density, and 80.34% fill factor. The NIL‐patterned layers form well‐defined, solvent‐resistant nanopillar arrays (8.7–29 nm height) with enhanced light‐harvesting capabilities. Detailed characterization reveals improved molecular ordering both donor acceptor phases, while advanced spectroscopy demonstrates accelerated charge transfer dynamics reduced exciton dissociation diffusion times. This pressure‐optimized strategy simultaneously enhances the optical, morphological, electronic properties establishing a promising pathway toward commercial‐scale photovoltaic technology.

Язык: Английский

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Halogenation Engineering of Solid Additives Enables 19.39% Efficiency and Stable Binary Organic Solar Cells via Manipulating Molecular Stacking and Aggregation of Both Donor and Acceptor Components

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 3, 2024

Abstract By selectively interacting with acceptor components, various typed solid additives achieve boosted power conversion efficiency (PCE) in organic solar cells (OSCs). However, due to the efficient active layer being composed of donor and materials, it is difficult obtain desired morphology by manipulating component alone, limiting further improvement PCEs. Herein, two a same backbone thiophene‐benzene‐thiophene (halogen‐free D1‐H) but different halogen substituents (fluorinated D1‐F chlorinated D1‐Cl) are developed probe working mechanism halogenated variation OSCs. Unlike D1‐H continuous charge distributions, D1‐Cl show isolated positive distribution benzene‐core negative thiophene, offering stronger non‐covalent interactions both (PM6) (L8‐BO), especially D1‐Cl. Consequently, D1‐Cl‐treated obtains an optimized phase separation improved molecular packing, boosting PCE 18.59% device stability OSCs, 17.62% for D1‐H‐treated counterparts. Moreover, using D18:L8‐BO D18:BTP‐eC9 as layers, binary OSCs impressive PCEs 19.29% 19.39%, respectively. This work indicates that halogenation engineering can effectively regulate improving elucidates underlying mechanism.

Язык: Английский

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Suppressing Exciton–Vibration Coupling via Intramolecular Noncovalent Interactions for Low‐Energy‐Loss Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Дек. 3, 2024

Minimizing energy loss is crucial for breaking through the efficiency bottleneck of organic solar cells (OSCs). The main mechanism can be attributed to non-radiative recombination (ΔEnr) that occurs due exciton-vibration coupling. To tackle this challenge, tuning intramolecular noncovalent interactions strategically utilized tailor novel fused ring electron acceptors (FREAs). Upon comprehensive analysis both theoretical and experimental results, approach effectively enhance molecular rigidity, suppress structural relaxation, reduce exciton reorganization energy, weakens coupling strength. Consequently, binary OSC device based on Y-SeSe, which features dual strong Se ⋅ O interactions, achieves an outstanding power conversion (PCE) 19.49 %, accompanied by extremely small ΔEnr 0.184 eV, much lower than those Y-SS Y-SSe devices with weaker interactions. These achievements not only set record selenium-containing OSCs, but also mark lowest reported value among high-performance devices. Furthermore, ternary blend showcases a remarkable PCE 20.51 one highest PCEs single-junction OSCs. This work demonstrates effectiveness in suppressing coupling, thereby achieving low-energy-loss high-efficiency

Язык: Английский

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Volatile Imide Additives with Large Dipole and Special Film Formation Kinetics Enable High‐Performance Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2025, Номер unknown

Опубликована: Март 6, 2025

Large dipole moment additives have strong interactions with the host materials, which can optimize morphology and improve photovoltaic performance of organic solar cells (OSCs). However, these are difficult to remove due their intermolecular interactions, may impair stability. Developing volatile large moments is challenging. Herein, we first report imide that could effectively OSCs through modification. Three N-(o-chlorophenyl)phthalimide (oClPA), N-(m-chlorophenyl)phthalimide (mClPA), N-(p-chlorophenyl)phthalimide (pClPA) were screened investigate effort positional isomerization on molecular configuration interaction. These (ClPAs) larger (2.0664 Debye for oClPA, 4.2361 mClPA, 4.7896 pClPA) compared reported solid additives. In contrast traditional simultaneous nucleation crystal growth, ClPAs induce acceptor nucleate then grow, contributes forming high-quality domains better crystallinity. To our knowledge, this unique film formation kinetics was first. The power conversion efficiency (PCE) based PM6:BTP-eC9 treated pClPA improved from 16.13 % 18.58 %. Additive also performed well in PM6:L8-BO, PM6:Y6, D18:L8-BO systems, a high PCE 19.04 achieved. Our results indicate using unit construct simple effective strategy, halogen atom has effect performance.

Язык: Английский

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Completely Fused Non‐Fullerene Acceptor Enables Efficient Postprocessing‐Free Organic Photovoltaics Cells

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 11, 2024

Abstract The photovoltaic performance of organic (OPV) cells can be significantly improved by regulating the aggregation structure and film formation kinetics constituent materials. However, many regulation strategies, including use additives annealing, require complex fabrication processes additional investments, which poses challenges for industrialization OPV cells. In this work, a completely fused non‐fullerene acceptor, GS‐20 is designed synthesized, with strong properties. incorporation as third component into PBQx‐TF:eC9‐2Cl‐based cell accelerates eC9‐2Cl improves molecular stacking promoting deposition. as‐cast ternary fabricated without any post‐treatments exhibited high V OC 0.890 maximum PCE 19.0%. Moreover, postprocessing‐free module using blade coating method obtains satisfactory 13.5%, indicating excellent feasibility large‐scale preparation. This work realizes an efficient through design strategy, facilitating technology.

Язык: Английский

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Volatile Imide Additives with Large Dipole and Special Film Formation Kinetics Enable High‐Performance Organic Solar Cells

Angewandte Chemie, Год журнала: 2025, Номер unknown

Опубликована: Март 6, 2025

Abstract Large dipole moment additives have strong interactions with the host materials, which can optimize morphology and improve photovoltaic performance of organic solar cells (OSCs). However, these are difficult to remove due their intermolecular interactions, may impair stability. Developing volatile large moments is challenging. Herein, we first report imide that could effectively OSCs through modification. Three N ‐( o ‐chlorophenyl)phthalimide ( ClPA), m p ClPA) were screened investigate effort positional isomerization on molecular configuration interaction. These (ClPAs) larger (2.0664 Debye for ClPA, 4.2361 4.7896 compared reported solid additives. In contrast traditional simultaneous nucleation crystal growth, ClPAs induce acceptor nucleate then grow, contributes forming high‐quality domains better crystallinity. To our knowledge, this unique film formation kinetics was first. The power conversion efficiency (PCE) based PM6:BTP‐eC9 treated ClPA improved from 16.13 % 18.58 %. Additive also performed well in PM6:L8‐BO, PM6:Y6, D18:L8‐BO systems, a high PCE 19.04 achieved. Our results indicate using unit construct simple effective strategy, halogen atom has effect performance.

Язык: Английский

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Dual-asymmetric backbone constructed polymerized small molecule acceptors for efficient all-polymer solar cells

Journal of Materials Chemistry A, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Dual-asymmetric polymer acceptors with finely-tailored molecular energy levels, crystallinity, and packing are developed for the first time, achieving an efficiency of 17.28% in all-polymer solar cells.

Язык: Английский

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Acceptor Crystallinity Engineering Enables >20% Efficiency Binary Organic Solar Cells with 83.0% Fill Factor

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 7, 2025

Abstract For spontaneously crystallized organic photovoltaic materials, morphology optimization remains a challenge due to the disparity in crystallinity between donor and acceptor components. Imperfections crystalline phases result significant trap‐assisted recombination, which emerges as critical factor limiting fill (FF) of solar cells (OSCs). Herein, method is introduced for precise regulation crystallinity, utilizing novel upper‐layer processing solvent, trichloroethylene (TCE), improve state vertical active layer. The TCE solvent synergistically optimizes intermolecular interactions among molecules balances film‐forming process, thereby increasing proportion transport forming high‐speed channels electron transport, subsequently reduces charge recombination. As result, efficiency binary reaches 20.05%. More importantly, an unprecedented FF 83.0% obtained, representing highest value OSCs. This facile effective approach offers promising means constructing efficient networks fabricating high‐efficiency morphologically stable

Язык: Английский

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High Efficiency Non‐Halogenated Solvent Processed Organic Solar Cells Through Synergistic Effects of Layer‐by‐Layer and Solid Additive

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 24, 2025

Abstract In the field of organic solar cells (OSCs), bulk heterojunction (BHJ) structure is most widely used. On contrary, layer‐by‐layer (LBL) gives a p‐i‐n separation where donor close to transparent electrode while acceptor reflective electrode, which shows be an ideal for OSCs. this work, volatile solid additives 2,5‐dibromoprazine (DBP) and 2‐bromine‐5‐iodopyrazine (BIP) are introduced regulate morphology LBL active layers. Comprehensive analysis reveals that DBP BIP can promote stronger molecular packing crystallinity BTP‐eC9, resulting in higher charge mobility, more efficient separation, suppressed bimolecular recombination significantly improve device filling factor (FF), especially devices. Consequently, by combining engineering additive BIP, outstanding power conversion efficiency (PCE) 19.63% based on PM1/BTP‐eC9 achieved further applied PM1/BTP‐eC9:eC9‐2Cl ternary system, PCE exceeded 20%. The results provide comprehensive insights into synergistic effect high‐performance photovoltaics.

Язык: Английский

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