The Phase Separation Control in All‐Polymer Solar Cells

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

Published: March 17, 2025

ABSTRACT All‐polymer solar cells (all‐PSCs) are of interest owing to their unique advantages, including remarkably improved device stability and exceptional mechanical stretchability. Over recent years, there has been a notable increase in the power conversion efficiency (PCE) all‐PSCs, largely attributed advancements morphology control active layer. Notably, domain size is paramount importance as it impacts critical factors such exciton dissociation, charge transport, collection. However, low glass transition temperature conjugated polymers, coupled with minimal change mixing entropy, often results an excessive degree phase separation. Consequently, essential comprehend evolution separation develop strategies regulate size. In this review, we elucidate key parameters that contribute enhancement present qualitative quantitative characterization techniques for Building on foundation, introduce principles regulating sizes, encompassing crystallinity, miscibility, molecular conformation from thermodynamic perspective, well film‐forming kinetics crystallization sequence kinetic perspective. Lastly, offer insights into current challenges potential future prospects all‐PSCs.

Language: Английский

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Manipulation of Nonradiative Process Based on the Aggregation Microenvironment to Customize Excited-State Energy Conversion

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: 57(9), P. 1360 - 1371

Published: April 26, 2024

ConspectusNonradiative processes with the determined role in excited-state energy conversion, such as internal conversion (IC), vibrational relaxation (VR), intersystem crossing (ISC), and or electron transfer (ET eT), have exerted a crucial effect on biological functions nature. Inspired by these, nonradiative process manipulation has been extensively utilized to develop organic functional materials fields of biomedicine. Therefore, comprehensive knowledge effective sophisticated for achieving high-efficiency are quintessential. So far, many strategies focused molecular engineering demonstrated tremendous potential manipulating tailor conversion. Besides, aggregation considerably affects due their ultrasensitivity, thus providing us another essential approach processes, famous aggregation-induced emission. However, weak interactions established upon aggregation, namely, microenvironment (AME), possess hierarchical, dynamic, systemic characteristics extremely complicated elucidate. Revealing relationship between AME employing it customize would greatly promote advanced utilization, biomedicine, etc., but remain huge challenge. Our group devoted much effort this goal.In Account, we focus our recent developments based AME. First, provide insight into terms its steric electronic regulation, illustrating possibility through modulation. Second, distinct enhanced is crystallization heterogeneous polymerization conduct crystallization-induced reversal from dark bright excited states dynamic hardening-triggered suppression highly efficient luminescence. Meanwhile, promoting ISC stabilizing triplet state also manipulated crystal polymer matrix induce room-temperature phosphorescence. Furthermore, employed exploit photothermy photosensitization reviewed. For photothermal besides weakened promoted motions, new strategy involving introduction diradicals narrow band gap enhance intermolecular put forward facilitate IC VR photosensitization, both rigid regulation electron-rich ISC, ET, eT superior photosensitization. Finally, explore existing challenges future directions modulation customized We hope that Account will be wide interest readers different disciplines.

Language: Английский

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Charge Polarity Modulation and Efficient Electron Transport in Quinoid–Donor–Acceptor Polymers by Acceptor Engineering for High-Performance Transistors

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

Published: Jan. 8, 2025

Fine-tuning the charge polarity and enhancing electron transport in conjugated polymers are critical for developing high-performance organic field-effect transistors (OFETs). Quinoidal polymers, characterized by planar backbones deep-lying lowest unoccupied molecular orbital (LUMO) energy levels, offer distinct advantages over their aromatic counterparts but face challenges achieving reliable mobilities exceeding 1 cm2 V–1 s–1. Herein, we synthesized a set of novel quinoid–donor–acceptor (Q-D-A) with various acceptor units. Increasing strength narrowed band gap, lowered LUMO shifted from unipolar p-type to ambipolar ultimately dominant n-type behavior. The electron-to-hole mobility ratio increased 0 40 behavior observed Q-D-A polymer first time. Consequently, strongest acceptor-based exhibited backbone, small effective mass, high crystallinity, low disorder, resulting 1.20 s–1 decent operational stability. This is record-high value quinoidal transport. Our findings viable strategy tuning improving providing insights into structure–property relationships essential advancing electronics.

Language: Английский

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Tuning the Aggregated Structure of Polymer Interlayers for High-Performance Quantum Dot Solar Cells and Photodetectors

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: unknown

Published: March 28, 2024

Due to their unique optoelectronic properties and potential for high efficiency, quantum dot (QD) solar cells photodetectors have gained tremendous attention. Achieving efficient charge transport extraction in these devices is crucial enhancing performance. Polymer interlayers play a vital role facilitating improving the device stability. This Spotlight on Applications paper focuses effective strategies employed tune microstructure of polymer QD achieve efficiency by bringing together recent literature. With use advanced synchrotron radiation scattering microscopic characterizations, we elucidate impact properties, casting solvents, physical blending methods microstructures photodetectors. Furthermore, take detailed look at some facile such as aggregation-suppressed synergy that enabled precise control over interlayers. Finally, provide perspectives future research directions obstacles field.

Language: Английский

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Designer Conjugation-Break Spacer That Boosts Charge Transport in Semiconducting Terpolymers

Macromolecules, Journal Year: 2024, Volume and Issue: 57(12), P. 5902 - 5914

Published: June 5, 2024

Conjugated polymers (CPs) are pivotal for high-mobility applications, typically avoiding nonconjugated units due to their perceived negative impact on charge transport. Contrary this belief, our study introduces a unit, DKPDO, which when employed as conjugation-break spacer (CBS), significantly enhances DKPDO was obtained center-modified isoindigo variant featuring strongly electron-withdrawing amide groups that diminish the electron density and foster multiple hydrogen-bonding interactions. This results in enhanced deficiency reinforced coplanarity relative isoindigo. incorporated into polymer backbone, comprising bithiophene, create series of terpolymers with varied molar ratios, allowing systematic evaluation solubilities, interchain interactions, crystallinities, energy levels. Notably, incorporating universal improvement hole mobilities operational stabilities over DKPDO-free counterpart. Remarkably, terpolymer containing 2.5% achieves high mobility 4.12 cm2 V–1 s–1, approximately 6-fold higher than parent CP among highest CPs based center-inserted units. The not only, first time, realizes transport enhancement CBS backbones but also sets precedent strategic use developing high-performing CPs.

Language: Английский

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Alleviating excessive aggregation of a non-fullerene acceptor by delaying and shortening the crystallization time to reduce the energy loss of ternary organic solar cells

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(11), P. 4142 - 4156

Published: Jan. 1, 2024

PYIT was added to the PM6:Y6 system delay and shorten crystallization time of Y6. The ternary strategy has been successfully proven increase D/A interface area for faster exciton dissociation. E loss decreased (0.559 eV 0.539 eV), PCE increased (15.40% 17.05%).

Language: Английский

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Design of Novel Functional Conductive Structures and Preparation of High-Hole-Mobility Polymer Transistors by Green Synthesis Using Acceptor–Donor–Acceptor Strategies

Polymers, Journal Year: 2024, Volume and Issue: 16(3), P. 396 - 396

Published: Jan. 31, 2024

The design of novel acceptor molecular structures based on classical building blocks is regarded as one the efficient ways to explore application organic conjugated materials in conductivity and electronics. Here, a moiety, thiophene-vinyl-diketopyrrolopyrrole (TVDPP), was envisioned prepared with longer conjugation length more rigid structure than thiophene-diketopyrrolopyrrole (TDPP). brominated TVDPP can be sequentially bonded trimethyltin-containing benzo[c][1,2,5]thiadiazole units via Suzuki polycondensation efficiently prepare polymer PTVDPP-BSz, which features high weight excellent thermal stability. polymerization process takes only 24 h eliminates need for chlorinated solvents or toxic tin-based reagents. Density functional theory (DFT) simulations film morphology analyses verify planarity crystallinity material, respectively, facilitates achievement carrier mobility. Conductivity measurements polymeric material transistor device show hole mobility 0.34 cm2 V−1 s−1, illustrates its potential functionalized semiconductor applications.

Language: Английский

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In Situ Monitoring the Face-on to Bimodal Texture Transition of P(NDI2OD-T2) during Side-Chain Selective Solvent Vapor Annealing

Macromolecules, Journal Year: 2024, Volume and Issue: 57(9), P. 4141 - 4157

Published: April 18, 2024

Charge transport in conjugated semiconducting polymer films predominantly occurs along the intrachain backbone as well interchain π–π stacking directions. The molecular orientation significantly affects favorable charge direction, since it determines alignment of stacking. Bimodal texture exhibited both out-of-plane and in-plane directions, thus forming a continuous 3D pathway to achieve optimized electrical performance. However, mechanism transition has not been well-defined; thus, construction bimodal remains an issue. Here, we achieved reorientation n-type high-molecular-weight poly{[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} [P(NDI2OD-T2)] from predominately face-on by employing side-chain selective solvent vapor annealing (SVA) post-treatment, which could be divided into two stages: film swelling process drying process. During process, observed situ 2D-GIWAXS, side chains were aligned perpendicular substrate due stronger solvent–side chain interactions than that main chain; part molecules began reorient edge-on. As more selectively dissolved, much greater free volume was provided for further transition. Eventually, intermediate edge-on formed. swollen crystallites stable. following some kept orientation, while metastable ones reorientated disappeared upon evaporation, ultimately leading texture. Consequently, mobility SVA-treated improved 0.092 (pristine film) 0.155 cm2 V–1 s–1 transporting.

Language: Английский

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Strain‐induced morphology evolution and charge transport in conjugated polymer films

Interdisciplinary materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 17, 2024

Abstract Stretchable conjugated polymer films are pivotal in flexible and wearable electronics. Despite significant advancements film stretchability through molecular engineering multicomponent blending, these often exhibit limited elastic ranges reduced carrier mobilities under large strain or after cyclic stretching. These limitations hinder their application Therefore, it is imperative to reveal the mechanical fatigue mechanisms incorporate multiple energy dissipation strategies enhance deformation electrical performance of stretched films. In this review, we begin by introducing typical behaviors Subsequently, discuss multiscale structural evolution various stretching conditions based on both in‐situ ex‐situ characterizations. This analysis further related diverse mechanisms. We next establish correlation between strain‐induced microstructure After that, propose develop highly constructing stable crosslinks promoting dynamics low‐crystalline Finally, highlight future opportunities for high‐performance mechanically devices stretchable

Language: Английский

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Efficient near-room-temperature synthesis of thiophene-vinyl-flanked diketopyrrolopyrrole dye-based mesopolymers for high-performance organic field-effect transistors

Dyes and Pigments, Journal Year: 2025, Volume and Issue: unknown, P. 112782 - 112782

Published: March 1, 2025

Language: Английский

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