A5100437921- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- Luminescence and Fluorescent Materials
- Semiconductor materials and interfaces
- Quantum Dots Synthesis And Properties
- Photochemistry and Electron Transfer Studies
- Catalytic Cross-Coupling Reactions
- Spectroscopy and Quantum Chemical Studies
- Semiconductor materials and devices
- Radical Photochemical Reactions
- Advanced Memory and Neural Computing
- Advanced Fluorescence Microscopy Techniques
- Silicon Carbide Semiconductor Technologies
- Microstructure and mechanical properties
- Antioxidant Activity and Oxidative Stress
- Ga2O3 and related materials
- Free Radicals and Antioxidants
- solar cell performance optimization
- Ferroelectric and Negative Capacitance Devices
- Advancements in Semiconductor Devices and Circuit Design
Guangxi University
2024-2025
Soochow University
2016-2025
MacDiarmid Institute for Advanced Materials and Nanotechnology
2014-2024
Victoria University of Wellington
2014-2024
The Dodd-Walls Centre for Photonic and Quantum Technologies
2021-2024
Southern University of Science and Technology
2022-2024
Shenyang University of Technology
2024
University of Otago
2024
Central South University
2021-2023
Xi'an Jiaotong University
2015-2023
Five polymer donors with distinct chemical structures and different electronic properties are surveyed in a planar narrow-bandgap fused-ring electron acceptor (IDIC)-based organic solar cells, which exhibit power conversion efficiencies of up to 11%. As service our authors readers, this journal provides supporting information supplied by the authors. Such materials peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical support issues arising from...
A polymer fibril assembly can dictate the morphology framework, in forming a network structure, which is highly advantageous bulk heterojunction (BHJ) organic solar cells (OSCs). fundamental understanding of how to manipulate such and its influence on BHJ device performance crucially important. Here, series donor-acceptor polymers, PBT1-O, PBT1-S, PBT1-C, used systematically investigate relationship between molecular morphology, photovoltaic performance. The subtle atom change side chains...
Modest exciton diffusion lengths dictate the need for nanostructured bulk heterojunctions in organic photovoltaic (OPV) cells; however, this morphology compromises charge collection. Here, we reveal rapid films of a fused-ring electron acceptor that, when blended with donor, already outperforms fullerene-based OPV cells. Temperature-dependent ultrafast annihilation measurements are used to resolve quasi-activationless coefficient at least 2 × 10–2 cm2/s, substantially exceeding typical...
It is widely known that the miscibility between donor and acceptor a crucial factor affects morphology thus device performance of nonfullerene organic solar cells (OSCs). In this Letter, we show incorporating third component with lower higher lowest unoccupied molecular orbital (LUMO) level into state-of-the-art PM6:Y6 system can significantly enhance devices. The best results ternary devices are achieved by adding small named ITCPTC (∼5% w/w), which improves power conversion efficiency...
Fast and highly efficient intramolecular singlet exciton fission in a pentacene dimer, consisting of two covalently attached, nearly orthogonal units is reported. Fission to triplet excitons from this ground state geometry occurs within 1 ps isolated molecules solution dispersed solid matrices. The process exhibits sensitivity environmental polarity competes with geometric relaxation the state, while subsequent decay strongly dependent on conformational freedom. near arrangement unlike any...
Abstract Relative to electron donors for bulk heterojunction organic solar cells (OSCs), acceptors that absorb strongly in the visible and even near‐infrared region are less well developed, which hinders further development of OSCs. Fullerenes as traditional have relatively weak absorption limited electronic tunability, constrains optical properties required donor. Here, high‐performance fullerene‐free OSCs based on a combination medium‐bandgap polymer donor (FTAZ) narrow‐bandgap...
Abstract Understanding the mechanism of singlet exciton fission, in which a separates into pair triplet excitons, is crucial to development new chromophores for efficient fission-sensitized solar cells. The challenge controlling molecular packing and energy levels solid state precludes clear determination fission pathway. Here, we circumvent this difficulty by utilizing covalent dimers pentacene with two types side groups. We report rapid intramolecular both molecules, one case via virtual...
Abstract In non-fullerene organic solar cells, the long-range structure ordering induced by end-group π–π stacking of fused-ring acceptors is considered as critical factor in realizing efficient charge transport and high power conversion efficiency. Here, we demonstrate that side-chain engineering could drive backbone assembly from a mode to an intermixed packing mode, non-stacking refine its solid-state properties. Different above-mentioned understanding, find close atom contacts can form...
A new fluorinated electron acceptor (FINIC) based on 6,6,12,12-tetrakis(3-fluoro-4-hexylphenyl)-indacenobis(dithieno[3,2-b;2',3'-d]thiophene) as the electron-donating central core and 5,6-difluoro-3-(1,1-dicyanomethylene)-1-indanone electron-deficient end groups is rationally designed synthesized. FINIC shows similar absorption profile in dilute solution to nonfluorinated analogue INIC. However, compared with INIC, film red-shifted absorption, down-shifted frontier molecular orbital energy...
Precisely tuning an organic semiconductor’s crystalline order allows exciton transport to proceed 2-3 orders of magnitude faster.
Organic photovoltaics (OPVs) promise cheap and flexible solar energy. Whereas light generates free charges in silicon photovoltaics, excitons are normally formed organic semiconductors due to their low dielectric constants, require molecular heterojunctions split into charges. Recent record efficiency OPVs utilise the small molecule, Y6, its analogues, which - unlike previous have band-gaps high constants. We show that, Y6 films, these factors lead intrinsic charge generation without a...
Abstract Here, a near‐infrared (NIR)‐absorbing small‐molecule acceptor (SMA) Y‐SeNF with strong intermolecular interaction and crystallinity is developed by combining selenophene‐fused core naphthalene‐containing end‐group, then as custom‐tailor guest incorporated into the binary PM6:L8‐BO host system. shows 65 nm red‐shifted absorption compared to L8‐BO. Thanks of Y‐SeNF, morphology PM6:L8‐BO:Y‐SeNF can be precisely regulated introducing achieving improved charge‐transporting suppressed...
Efficient exciton diffusion and charge transport play a vital role in advancing the power conversion efficiency (PCE) of organic solar cells (OSCs). Here, facile strategy is presented to simultaneously enhance exciton/charge widely studied PM6:Y6-based OSCs by employing highly emissive trans-bis(dimesitylboron)stilbene (BBS) as solid additive. BBS transforms sites from more H-type aggregate into J-type aggregate, which benefits resonance energy transfer for PM6 Y6. Transient gated...
A strong electron-deficient unit CNPz as a solid additive was developed in PTQ10/ m -BTP-PhC6 binary organic solar cells. high PCE of 19.67% achieved with significant increase the J SC and FF (81.8%).
Strong Coulomb interactions in organic photovoltaic cells dictate that charges must separate over relatively long distances order to circumvent geminate recombination and produce photocurrent. In this article, we measure the distance distributions of thermalized charge pairs by accessing a regime at low temperature where are frozen out following primary separation step recombine monomolecularly via tunneling. The exponential attenuation tunneling rate with provides sensitive probe...
The remarkable rise of organometal halide perovskites as solar photovoltaic materials has been followed by promising developments in light-emitting devices, including lasers. Here we present unique insights into the processes leading to photon emission these materials. We employ ultrafast broadband photoluminescence (PL) and transient absorption spectroscopies directly link density dependent charge dynamics PL. find that exceptionally strong PL at band edge is preceded thermalization free...
Abstract It is widely recognized that subtle changes in the chemical structure of organic semiconductors can induce dramatic variations their optoelectronic properties and device performance, especially for nonfullerene small‐molecule acceptors (SMAs). For instance, halogenation end groups acceptor–donor–acceptor‐type SMAs an effective strategy to modulate group thus entire SMA. While previous position modulations have focused on only one substituent, this study shows development three...
Conventional descriptions of excitons in semiconducting polymers do not account for several important observations polymer:fullerene photovoltaic blends, including the ultrafast time scale charge photogeneration phase separated blends and intermediate role delocalized transfer states. We investigate nature thin films by using broadband photoluminescence spectroscopy. Our technique enables us to resolve energetic relaxation, as well volume population dynamics on scales. substantial...
A photochemical borylation of electron-rich aryl (pseudo)halides <italic>via</italic> a triplet cation mechanism has been described.
Highly efficient slot-die coated organic solar cells are fabricated by balancing the pre-aggregation and crystallization kinetics.
The field of organic solar cells has experienced paradigm-shifting changes in recent years because the emergence nonfullerene acceptors (NFAs). It is critically important to gain more insight into structure–property relationship emerging A′-DAD-A′-type NFAs. In this Letter, a family NFAs named BPF-4F, BPT-4F, and BPS-4F incorporating various chalcogen-containing heterocycles, i.e., furan, thiophene, selenophene, respectively, was designed synthesized. These exhibited dramatic differences...
Abstract The recently reported efficient polymerized small‐molecule acceptors (PSMAs) usually adopt a regioregular backbone by polymerizing precursors with low‐reactivity 5‐brominated 3‐(dicyanomethylidene)indan‐1‐one (IC) end group or its derivatives, leading to low molecular weight, and thus reduce active layer mechanical properties. Herein, series of newly designed chlorinated PSMAs originating from isomeric IC groups are developed adjusting positions copolymerized sites on achieve high...
In pursuing high stability and power conversion efficiency for organic photovoltaics (OPVs), a sequential deposition (SD) approach to fabricate active layers with p-i-n structures (where p, i, n represent the electron donor, mixed donor:acceptor, acceptor regions, respectively, distinctively different from bulk heterojunction (BHJ) structure) has emerged. Here, we present novel that by incorporating two polymer donors,