A5051944488- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Thin-Film Transistor Technologies
- Molecular Junctions and Nanostructures
- Semiconductor materials and interfaces
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Fullerene Chemistry and Applications
- Silicon and Solar Cell Technologies
- Luminescence and Fluorescent Materials
- Nanowire Synthesis and Applications
- solar cell performance optimization
- Organic and Molecular Conductors Research
- Ga2O3 and related materials
- ZnO doping and properties
- Advanced battery technologies research
- Gas Sensing Nanomaterials and Sensors
- Solar-Powered Water Purification Methods
- Membrane Separation Technologies
- Optical Coatings and Gratings
- Machine Learning in Materials Science
Donghua University
2018-2025
Materials Science & Engineering
2018-2024
Nankai University
2024
Beijing Normal University
2024
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials
2020-2022
Renmin University of China
2022
Beijing University of Chemical Technology
2022
National Center for Nanoscience and Technology
2022
Technische Universität Dresden
2016-2019
Linköping University
2011-2016
Abstract The chemical structure of donors and acceptors limit the power conversion efficiencies achievable with active layers binary donor-acceptor mixtures. Here, using quaternary blends, double cascading energy level alignment in bulk heterojunction organic photovoltaic are realized, enabling efficient carrier splitting transport. Numerous avenues to optimize light absorption, transport, charge-transfer state levels opened by constitution components. Record-breaking PCEs 18.07% achieved...
Abstract Single‐layered organic solar cells (OSCs) using nonfullerene acceptors have reached 16% efficiency. Such a breakthrough has inspired new sparks for the development of next generation OSC materials. In addition to optimization electronic structure, it is important investigate essential solid‐state structure that guides high efficiency bulk heterojunction blends, which provides insight in understanding how pair an efficient donor–acceptor mixture and refine film morphology. this...
Abstract The ternary strategy, introducing a third component into binary blend, opens simple and promising avenue to improve the power conversion efficiency (PCE) of organic solar cells (OSCs). judicious selection an appropriate component, without sacrificing photocurrent voltage output OSC, is significant importance in devices. Herein, highly efficient OSCs fabricated using approach are demonstrated, wherein novel non‐fullerene acceptor L8‐BO‐F designed incorporated PM6:BTP‐eC9 blend. three...
A new, low-band-gap alternating copolymer consisting of terthiophene and isoindigo has been designed synthesized. Solar cells based on this polymer PC(71)BM show a power conversion efficiency 6.3%, which is record for solar with an optical band gap below 1.5 eV. This work demonstrates the great potential moieties as electron-deficient units building donor-acceptor-type polymers high-performance cells.
The ternary blend is demonstrated as an effective strategy to promote the device performance of organic photovoltaics (OPVs) due dilution effect. While compromise between charge generation and recombination remains a challenge. Here, mixed diluent for further improving efficiency OPV proposed. Specifically, high-performance system with polymer donor, i.e., PM6, nonfullerene acceptor (NFA), BTP-eC9, diluted by diluents, which involve high bandgap NFA BTP-S17 low BTP-S16 (similar that...
A series of ternary organic photovoltaics (OPVs) are fabricated with one wide bandgap polymer D18-Cl as donor, and well compatible Y6 Y6-1O acceptor. The open-circuit-voltage (
Compared with inorganic or perovskite solar cells, the relatively large non-radiative recombination voltage losses (ΔVnon-rad ) in organic cells (OSCs) limit improvement of open-circuit (Voc ). Herein, OSCs are fabricated by adopting two pairs D-π-A polymers (PBT1-C/PBT1-C-2Cl and PBDB-T/PBDB-T-2Cl) as electron donors a wide-bandgap molecule BTA3 acceptor. In these blends, charge-transfer state energy (ECT high 1.70-1.76 eV is achieved, leading to small energetic differences between singlet...
Spectroscopic photodetection is a powerful tool in disciplines such as medical diagnosis, industrial process monitoring, or agriculture. However, its application novel fields, including wearable and biointegrated electronics, hampered by the use of bulky dispersive optics. Here, solution‐processed organic donor–acceptor blends are employed resonant optical cavity device architecture for wavelength‐tunable photodetection. While conventional photodetectors respond to above‐gap excitation,...
Abstract Side‐chain modifications of non‐fullerene acceptors (NFAs) are essential for harvesting their full potential in organic solar cells (OSC). Here, an effective alkyl‐chain‐branching approach the Y‐series NFAs flanking meta‐substituted phenyl side groups at outer positions is demonstrated. Compared to BTP‐4F‐PC6 with linear m ‐hexylphenyl chains, two new named BTP‐4F‐P2EH and BTP‐4F‐P3EH developed bulkier alkyl chains branched β γ positions, respectively. These result altered molecular...
Abstract A series of tetrathiophene‐based fully non‐fused ring acceptors (4T‐1, 4T‐2, 4T‐3, and 4T‐4), which can be paired with the star donor polymer PBDB‐T to fabricate highly efficient organic solar cells are developed. Tailoring size lateral chains tune solubility packing mode acceptor molecules in neat blend films. It is found that incorporation 2‐ethylhexyl effectively change compatibility PBDB‐T, an encouraging power conversion efficiency 10.15% accomplished by 4T‐3‐based cells. also...
Halogenation of terminal acceptors has been shown to give dramatic improvements in power conversion efficiencies (PCEs) organic solar cells (OSCs). Similar significant results could be expected from the halogenation central units state-of-the-art Y-series acceptors. Herein, a pair acceptors, termed CH6 and CH4, featuring conjugation-extended phenazine unit with without fluorination, have synthesized. The fluorinated enhanced molecular interactions crystallinity, superior fibrillar network...
Abstract Given that bromine possesses similar properties but extra merits of easily synthesizing and polarizing comparing to homomorphic fluorine chlorine, it is quite surprising very rare high-performance brominated small molecule acceptors have been reported. This may be caused by undesirable film morphologies stemming from relatively larger steric hindrance excessive crystallinity bromides. To maximize the advantages bromides while circumventing weaknesses, three (CH20, CH21 CH22) are...
The diverse molecular stacking tuned by peripheral halogens in non-fullerene acceptors (NFAs) significantly affects the physicochemical properties, film morphologies and thus power conversion efficiencies (PCEs) of organic solar cells (OSCs).
In this work, inspired by the principles of a pressure cooker, we utilized high-pressure method to address processing challenges associated with high molecular weight polymers. Through approach, successfully dissolved D18 in chloroform at 100 °C within pressure-tight vial. The increased steam raised boiling point and dissolving capacity chloroform, enabling creation hybrid film superior properties, including more ordered arrangement, crystallinity, extended exciton diffusion length, improved...
Efficient 3D NFAs through central unit connection blaze a new trail in further molecular structural optimization of state-of-the-art NFAs.
Abstract Achieving high-efficiency indium tin oxide (ITO)-free organic optoelectronic devices requires the development of high-conductivity and high-transparency materials for being used as front electrode. Herein, sol-gel-grown zinc (ZnO) films with high conductivity (460 S cm −1 ) low optical absorption losses in both visible near-infrared (NIR) spectral regions are realized utilizing persistent photoinduced doping effect. The origin increased after photo-doping is ascribed to selective...
Abstract Currently, nearly all high‐efficiency organic photovoltaic devices use donor polymers based on the benzo‐dithiophene (BDT) unit. To diversify choices of building blocks for high‐performance polymers, benzo‐difuran (BDF) units is explored, which can achieve reduced steric hindrance, stronger molecular packing, and tunable energy levels. In previous research, performance BDF‐based lagged behind those BDT‐based devices. this study, a high efficiency (18.4%) achieved using polymer...
Abstract Peripheral halogen regulations can endow non‐fullerene acceptors (NFAs) with enhanced features as organic semi‐conductors and further boost efficient solar cells (OSCs). Herein, based on a remarkable molecular platform of CH14 more than six halogenation positions, preferred NFA CH23 is constructed by synergetic swapping both central end units, rendering the overall enlarged dipole moment, packing density thus relative dielectric constant. Consequently, CH23‐based binary OSC reaches...
Reducing interface nonradiative recombination is important for realizing highly efficient perovskite solar cells. In this work, we develop a synergistic bimolecular interlayer (SBI) strategy via 4-methoxyphenylphosphonic acid (MPA) and 2-phenylethylammonium iodide (PEAI) to functionalize the interface. MPA induces an in-situ chemical reaction at surface forming strong P-O-Pb covalent bonds that diminish defect density upshift Fermi level. PEAI further creates additional negative dipole so...
Abstract Although the advances in organic solar cells (OSCs) have been considerable, their efficiency is still limited by recombination losses. Photogenerated electrons and holes are generally bound as localized excitons semiconductors. The transition from into free charges requires diffusion dissociation processes, which parasitic losses exist. Reducing these necessary for highly efficient OSCs. crystallization behavior of active layers can influence exciton dissociation. In this work,...
By introducing highly crystalline material D18A into donor layer acting as energy and nucleating agent, an optimal PCE of 19.25% was achieved for PM1 : D18A/L8-BO based OPVs.
Abstract Although asymmetric molecular design has been widely demonstrated effective for organic photovoltaics (OPVs), the correlation between geometry and their optoelectronic properties is still unclear. To access this issue, we have designed synthesized several symmetric-asymmetric non-fullerene acceptors (NFAs) pairs with identical physical properties. Interestingly, found that NFAs universally exhibited increased open-circuit voltage compared to symmetric counterparts, due reduced...
Abstract Reducing non‐radiative energy loss (∆ E nr ) is critical for enhancing the photovoltaic performance of organic solar cells (OSCs). To achieve this, a small molecular donor, LJ1, introduced as third component in host system D: A (D18: BTP‐eC9‐4F). The cascade‐like level alignment D18, and BTP‐eC9‐4F facilitates efficient charge transfer. LJ1's good solubility processing solvent high miscibility with delay precipitation BTP‐eC9‐4F, leading to improved phase morphology blend films....