A5069011107- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
- Fullerene Chemistry and Applications
- Molecular Junctions and Nanostructures
- Crystal Structures and Properties
- Quantum Dots Synthesis And Properties
- Nonlinear Optical Materials Research
- Semiconductor materials and interfaces
- Photonic Crystal and Fiber Optics
- Thin-Film Transistor Technologies
- Optical and Acousto-Optic Technologies
- Chalcogenide Semiconductor Thin Films
- Advanced Fiber Optic Sensors
- Electronic Health Records Systems
- Biomedical Text Mining and Ontologies
- Silicon and Solar Cell Technologies
- Magnetic confinement fusion research
- Advanced Fiber Laser Technologies
- Crystallography and molecular interactions
- Social and Cultural Dynamics
- Anodic Oxide Films and Nanostructures
City University of Hong Kong
2020-2024
Wuhan University
2012-2024
South China University of Technology
2022-2023
State Key Laboratory of Luminescent Materials and Devices
2023
Hong Kong University of Science and Technology
2014-2020
University of Hong Kong
2014-2020
Southwest University
2019-2020
Weatherford College
2020
Hefei University of Technology
2020
Robert Bosch (Germany)
2020
Abstract Although the field of polymer solar cell has seen much progress in device performance past few years, several limitations are holding back its further development. For instance, current high-efficiency (>9.0%) cells restricted to material combinations that based on limited donor polymers and only one specific fullerene acceptor. Here we report achievement high-performance (efficiencies up 10.8%, fill factors 77%) thick-film for multiple polymer:fullerene via formation a...
A record power conversion efficiency (PCE) of over 19% is realized in planar-mixed heterojunction (PMHJ) organic solar cells (OSCs) by adopting the asymmetric selenium substitution strategy making a pseudosymmetric electron acceptor, BS3TSe-4F. The combined molecular asymmetry with more polarizable increases dielectric constant D18/BS3TSe-4F blend, helping lower exciton binding energy. On other hand, dimer packing BS3TSe-4F facilitated to enable free charge generation, efficient dissociation...
We report a series of difluorobenzothiadizole (ffBT) and oligothiophene-based polymers with the oligothiophene unit being quaterthiophene (T4), terthiophene (T3), bithiophene (T2). demonstrate that polymer based on ffBT T3 an asymmetric arrangement alkyl chains enables fabrication 10.7% efficiency thick-film solar cells (PSCs) without using any processing additives. By decreasing number thiophene rings per repeating thus increasing effective density in backbone, HOMO LUMO levels are...
Non-fullerene organic solar cells with power conversion efficiencies of up to 6.3% are reported using properly matched donor and acceptor.
A tetraphenylethylene core-based small molecular acceptor with a unique 3D structure is developed. Bulk-heterojunction blend films feature size (≈20 nm) are obtained, which lead to non-fullerene organic solar cells (OSCs) 5.5% power conversion efficiency. The work provides new design approach efficient OSCs based on 3D-structured small-molecule acceptors.
Abstract To achieve efficient organic solar cells, the design of suitable donor–acceptor couples is crucially important. State-of-the-art donor polymers used in fullerene cells may not perform well when they are combined with non-fullerene acceptors, thus new need to be developed. Here we report efficiencies up 10.9%, enabled by a novel polymer that exhibits strong temperature-dependent aggregation but intentionally reduced crystallinity due introduction less symmetric monomer unit. Our...
Understanding the molecular structure and self-assembly of thiadiazole-derived non-fullerene acceptors (NFAs) is very critical for elucidating origin their extraordinary charge generation transport properties that enable high power conversion efficiencies to be achieved in these systems. A comprehensive crystallographic study on a state-of-the-art NFA, Y6, its selenium analog, CH1007, has been conducted which revealed face-to-face π-core interaction induced by benzo[2,1,3]thiadiazole...
All-polymer solar cells based on a pair of crystalline low-bandgap polymers (NT and N2200) are demonstrated to achieve high short-circuit current density 11.5 mA cm-2 power conversion efficiency up 5.0% under the standard AM1.5G spectrum with one sun intensity. The performance these NT:N2200-based can be attributed low optical bandgaps reasonably balanced electron hole mobilities NT:N2200 blends due nature two polymers.
A 7.3% efficiency non–fullerene polymer solar cell is realized by combining a large-bandgap PffT2-FTAZ-2DT with small-bandgap acceptor IEIC. The complementary absorption of donor and small-molecule responsible for the high-performance solar-cell device. This work provides important guidance to improve performance non-fullerene cells. As service our authors readers, this journal supporting information supplied authors. Such materials are peer reviewed may be re-organized online delivery, but...
Designing new hole-transporting materials (HTMs) with desired chemical, electrical, and electronic properties is critical to realize efficient stable inverted perovskite solar cells (PVSCs) a p-i-n structure. Herein, the synthesis of novel 3D small molecule named TPE-S its application as an HTM in PVSCs are shown. The all-inorganic made using TPE-S, processed without any dopant or post-treatment, highly stable. Compared control devices based on commonly used HTM, PEDOT:PSS, exhibit improved...
Hybrid organic/inorganic perovskite solar cells are among the most competitive emerging photovoltaic technologies.
Abstract Solution-processed organic solar cells (OSCs) are a promising candidate for next-generation photovoltaic technologies. However, the short exciton diffusion length of bulk heterojunction active layer in OSCs strongly hampers full potential to be realized these OSCs. Herein, we report high-performance with pseudo-bilayer architecture, which possesses longer benefited from higher film crystallinity. This feature ensures synergistic advantages efficient dissociation and charge transport...
Nonfullerene acceptors (NFAs) have played an important role in the development of organic solar cells. However, optical absorption most NFAs is limited within 600–900 nm, prohibiting further improvement short-circuit current density (Jsc). To alleviate this problem, a fused-ring π-core BzS was designed by combining weakly electron-withdrawing benzotriazole (Bz) and strongly electron-donating selenophene together. Besides, length N-alkyl chain on Bz moiety engineered to tune morphology,...
Abstract Ternary solar cells comprising both fullerene and nonfullerene acceptors have shown a rapid increase in power conversion efficiency, which holds promise commercial applications. Despite the progress, there is still lack of fundamental understanding relations between microstructure (photovoltaic/mechanical) properties these ternary blend systems. In this work, dependence molecular packing, phase separation, mechanical properties, photovoltaic performance on acceptor composition...
A major challenge hindering the further development of all-polymer solar cells (all-PSCs) employing polymerized small-molecule acceptors is relatively low fill factor (FF) due to difficulty in controlling active-layer morphology. The issues typically arise from oversized phase separation resulting thermodynamically unfavorable mixing between two macromolecular species, and disordered molecular orientation/packing highly anisotropic polymer chains. Herein, a facile top-down strategy engineer...
The influences of various processing parameters and polymer molecular weight on the morphology properties poly[(5,6‐difluoro‐2,1,3‐benzothiadiazol‐4,7‐diyl)‐alt‐(3,3′′′‐di(2‐octyldodecyl) 2,2′;5′,2″;5″,2′′′‐quaterthiophen‐5,5′′′‐diyl)] (PffBT4T‐2OD)‐based solar cells (PSCs) are investigated. High spin rate/high temperature conditions found to significantly reduce crystallinity change backbone orientation from face‐on edge‐on. Most surprisingly, it is that median domain sizes...
Abstract Ternary organic solar cells (OSCs) have attracted much research attention, as they can maintain the simplicity of single‐junction device architecture while broadening absorption range OSCs. However, one main challenge that limits development ternary OSCs is difficulty in controlling morphology In this paper, an effective approach to control presented leads multiple cases efficient nonfullerene with efficiencies up 11.2%. This based on a donor polymer strong temperature dependent...
A new mixed halide, Cs2HgI2Cl2, which contains the highly polar tetrahedron of anion (HgI2Cl2)2–, has been designed and synthesized by reaction in solution. In its single crystal, isolated (HgCl2I2)2– groups are arranged to form chains. The chains then further connected into a three-dimensional framework through Cs atoms that occupy empty spaces surrounded halide atoms. All align such way gives net polarization, leading it show phase matchable second harmonic generation (SHG) effect as...