The principles, design and applications of fused-ring electron acceptors

Nature Reviews Chemistry, Journal Year: 2022, Volume and Issue: 6(9), P. 614 - 634

Published: Aug. 1, 2022

Language: Английский

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From Solution to Thin Film: Molecular Assembly of π-Conjugated Systems and Impact on (Opto)electronic Properties

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(13), P. 8395 - 8487

Published: June 5, 2023

The assembly of conjugated organic molecules from solution to solid-state plays a critical role in determining the thin film morphology and optoelectronic properties solution-processed electronics photovoltaics. During evaporative processing, π-conjugated systems can assemble via various forms intermolecular interactions, forming distinct aggregate structures that drastically tune charge transport landscape solid-state. In blend composed donor polymer acceptor molecules, neat materials couples with phase separation crystallization processes, leading complex transition pathways which govern morphology. this review, we provide an in-depth review molecular processes polymers nonfullerene small molecule acceptors discuss their impact on properties. We then shift our focus relevant solar cells fundamentals highlight how processing conditions affect device performance.

Language: Английский

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Fluorination Enhances NIR‐II Emission and Photothermal Conversion Efficiency of Phototheranostic Agents for Imaging‐Guided Cancer Therapy

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(3)

Published: Oct. 27, 2022

Phototheranostics with second near-infrared (NIR-II) imaging and photothermal effect have become a burgeoning biotechnology for tumor diagnosis precise treatment. As important parameters of phototheranostic agents (PTAs), fluorescence quantum yield (QY) conversion efficiency (PCE) are usually considered as pair contradictions that is difficult to be simultaneously enhanced. Herein, fluorination strategy designing A-D-A type PTAs synchronously improved QY PCE proposed. Experimental results show the molar extinction coefficient (ε), NIR-II QY, all fluorinated nanoparticles (NPs) definitely compared chlorinated counterparts. Theoretical calculation demonstrate can maximize electrostatic potential difference by virtue high electronegativity fluorine, which may increase intra/intermolecular D-A interactions, tighten molecule packing, further promote ε, ultimately leading enhanced PCE. In these PTA NPs, FY6-NPs display emission extended 1400 nm highest (4.2%) (80%). These features make perform well in high-resolution vasculature imaging-guided therapy (PTT) tumors. This study develops valuable guideline constructing organic performance.

Language: Английский

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Geometry design of tethered small-molecule acceptor enables highly stable and efficient polymer solar cells

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: May 22, 2023

With the power conversion efficiency of binary polymer solar cells dramatically improved, thermal stability small-molecule acceptors raised main concerns on device operating stability. Here, to address this issue, thiophene-dicarboxylate spacer tethered are designed, and their molecular geometries further regulated via thiophene-core isomerism engineering, affording dimeric TDY-α with a 2, 5-substitution TDY-β 3, 4-substitution core. It shows that processes higher glass transition temperature, better crystallinity relative its individual acceptor segment isomeric counterpart TDY-β, more stable morphology donor. As result, based delivers 18.1%, most important, achieves an extrapolated lifetime about 35000 hours retaining 80% initial efficiency. Our result suggests proper geometry design, can achieve both high

Language: Английский

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Physical insights into non-fullerene organic photovoltaics

Nature Reviews Physics, Journal Year: 2024, Volume and Issue: 6(6), P. 365 - 381

Published: April 15, 2024

Language: Английский

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Sensitive photodetection below silicon bandgap using quinoid-capped organic semiconductors

Science Advances, Journal Year: 2023, Volume and Issue: 9(13)

Published: March 31, 2023

High-sensitivity organic photodetectors (OPDs) with strong near-infrared (NIR) photoresponse have attracted enormous attention due to potential applications in emerging technologies. However, few semiconductors been reported photoelectric response beyond ~1.1 μm, the detection limit of silicon detectors. Here, we extend absorption small-molecule below bandgap, and even 0.77 eV, through introducing newly designed quinoid-terminals high Mulliken-electronegativity (5.62 eV). The fabricated photodiode-type NIR OPDs exhibit detectivity (D*) over 1012 Jones 0.41 1.2 μm under zero bias a maximum 2.9 × at 1.02 which is highest D* for photovoltaic-mode spectra 1.1 μm. 0.9 comparable those commercial InGaAs photodetectors, despite our shorter than (~1.7 μm). A spectrometer prototype wide measurable region (0.4 1.25 μm) imaging 1.2-μm illumination are demonstrated successfully OPDs.

Language: Английский

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Organic Optoelectronic Materials: A Rising Star of Bioimaging and Phototherapy

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(17)

Published: Aug. 19, 2023

Abstract Recently, many organic optoelectronic materials (OOMs), especially those used in light‐emitting diodes (OLEDs), solar cells (OSCs), and field‐effect transistors (OFETs), are explored for biomedical applications including imaging photoexcited therapies. In this review, recently developed OOMs fluorescence imaging, photoacoustic photothermal therapy, photodynamic summarized. Relationships between their molecular structures, nanoaggregation photophysical mechanisms, properties various discussed. Mainly four kinds of covered: thermally activated delayed OLEDs, conjugated small molecules polymers OSCs, charge‐transfer complexes OFETs. Based on the unique optical properties, excitation light wavelength exciton dynamics, they respectively exploited suitable applications. This review is intended to serve as a bridge researchers area devices Moreover, it provides guidance selecting or modifying high‐performance uses. Current challenges future perspectives also discussed with hope inspiring further development efficient

Language: Английский

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Organic Persistent RTP Crystals: From Brittle to Flexible by Tunable Self‐Partitioned Molecular Packing

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(26)

Published: March 25, 2023

Aiming to solve the trade-off of "room-temperature phosphorescence (RTP)-flexibility" in principle, organic RTP crystals with elastic/plastic deformation are realized. These properties mainly due divisional aggregation structures aromatics and alkoxy chains, can be modulated by controllable molecular configurations. The longest lifetime 972.3 ms is achieved as highest record for flexible crystals. Plastic persistent realized, which applied into biomedical optical technologies afterglow delivery. Moreover, relationship among deformation, property, aggregated established. determined difference interaction energies from chains. For BP-OR series twisted configurations, chain middle length favorable while strength π-π coupling cruical factor property Xan-OR planar skeletons. A new way promote development crystals, modulation well rational distribution intermolecular interactions, explored.

Language: Английский

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Tailoring Multifunctional Self‐Assembled Hole Transporting Molecules for Highly Efficient and Stable Inverted Perovskite Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(10)

Published: Jan. 29, 2023

Abstract The self‐assembled hole transporting molecules (SAHTMs) bearing anchoring groups have been established as the layers (HTLs) for highly efficient p–i–n perovskite solar cells (PSCs), yet their stability and engineering at molecular level remain challenging. A topological design of anisotropic aligned SAHTM‐based HTLs operationally stable PSCs that exhibit exceptional solar‐to‐electric power conversion efficiencies (PCEs) is demonstrated. judiciously designed multifunctional comprise donor–acceptor subunit phosphonic acid group anchoring, realizing face‐on π‐stacking parallel to transparent conductive oxide substrate. high affinity SAHTMs multi‐crystalline thin film benefits passivating buried interface, strengthening interfacial contact while facilitating transfer. Consequently, PSC devices are obtained with a champion PCE 23.24% outstanding operational toward various environmental factors including long‐term full sunlight soaking evaluated temperatures. Perovskite modules efficiency approaching 20% also fabricated an active device area above 17 cm 2 .

Language: Английский

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Easy Isomerization Strategy for Additives Enables High‐Efficiency Organic Solar Cells

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(22)

Published: April 27, 2023

Abstract The morphological features of the active layer has always been an important factor limiting efficiency organic solar cells (OSCs). Although halogen‐based additives capable forming non‐covalent bonds with molecules can effectively adjust morphology layer, inner mechanism positional isomerization on crystallization kinetics bulk heterojunction ignored, which hinders further development this technique. Herein, a new additive‐assisted optimization strategy for high‐efficiency OSCs based three isomeric is proposed, have different sites two bromine substituents benzene ring. results demonstrate that symmetrically structured smallest dipole moment, lowest steric hindrance and most uniformly distributed electrostatic potential, form more suitable interactions acceptor, resulting in reasonable molecular spatial distribution better π–π stacking behavior. For other non‐fullerene systems, additive also shows best effect optimizing aggregation stacking. This work provides guidance screening designing excellent improvement capability expected to profound influence increasing without adopting possessing complex conjugated backbones branched chains.

Language: Английский

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