A5046732879- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Silicon and Solar Cell Technologies
- Fullerene Chemistry and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Biochemical effects in animals
- Molecular Junctions and Nanostructures
- Spectroscopy and Chemometric Analyses
- Semiconductor materials and interfaces
- Quantum Dots Synthesis And Properties
- Photovoltaic System Optimization Techniques
- solar cell performance optimization
- Melamine detection and toxicity
- Molecular spectroscopy and chirality
University of Hong Kong
2014-2018
Hong Kong University of Science and Technology
2014-2018
University of Washington
2018
Kowloon Hospital
2017
HKUST Shenzhen Research Institute
2015-2017
UNSW Sydney
1996-2004
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...
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...
A new polymer acceptor, naphthodiperylenetetraimide-vinylene (NDP-V), featuring a backbone of altenating naphthodiperylenetetraimide and vinylene units is designed applied in all-polymer solar cells (all-PSCs). With this record power-conversion efficiencies (PCE) 8.59% has been achieved for all-PSCs. The design principle NDP-V to reduce the conformational disorder previously developed high-performance PDI-V, perylenediimide-vinylene polymer. chemical modifications result favorable changes...
Abstract Polymer solar cells (PSCs) continue to be a promising low‐cost and lead‐free photovoltaic technology. Of critical importance PSCs is understanding manipulating the composition of amorphous mixed phase, which governed by thermodynamic molecular interactions polymer donor acceptor molecules kinetics casting process. This progress report clarifies defines nomenclature relating miscibility its relevance implications PSC devices in light new developments. Utilizing scanning transmission...
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...
All-polymer solar cells with 7.57% power conversion efficiency are achieved via a new perylenediimide-based polymeric acceptor. Furthermore, the device processed in ambient air without encapsulation can still reach high (PCE) of 7.49%, which is significant economic advantage from an industrial processing perspective. These results represent highest PCE polymers. As service to our authors and readers, this journal provides supporting information supplied by authors. Such materials peer...
Abstract State‐of‐the‐art organic solar cells (OSCs) typically suffer from large voltage loss ( V ) compared to their inorganic and perovskite counterparts. There are some successful attempts reduce the by decreasing energy offsets between donor acceptor materials, OSC community has demonstrated efficient systems with either small highest occupied molecular orbital (HOMO) offset or negligible lowest unoccupied (LUMO) donors acceptors. However, OSCs based on a donor/acceptor system both HOMO...
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...
A difluorobenzoxadiazole building block is synthesized and utilized to construct a conjugated polymer leading high-performance thick-film solar cells with V(OC) of 0.88 V power conversion efficiency 9.4%. This new can be used in many possible structures for various organic electro-nic applications.
Abstract A novel acceptor–donor–acceptor (A–D–A) type electron acceptor 6TIC‐4F with terthieno[3,2‐ b ]thiophene (6T) as the core unit is rationally designed and synthesized, which exhibits an extraordinarily narrow bandgap (≈1.24 eV) strong absorption between 650 1000 nm. X‐ray crystallographic analysis reveals that it has unique intermolecular π–π stacking. The solar cells based on as‐cast poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)‐benzo[1,2‐ :4,5‐ b′ ]dithiophene))‐ alt...
A series of tetraphenyl carbon-group (tetraphenylmethane, tetraphenylsilane and tetraphenylgermane) core based 3D-structure non-fullerene electron acceptors were synthesized polymer solar cell performances tested. power conversion efficiency up to 4.3% was achieved.
It is still a great challenge to fabricate conjugated polymer monolayer field-effect transistors (PoM-FETs) due intricate crystallization and film formation of polymers. Here we demonstrate PoM-FETs based on single polymer. The resulting are highly reproducible exhibit charge carrier mobilities reaching 3 cm2 V-1 s-1. high performance attributed the strong interactions chains present already in solution leading pronounced edge-on packing well-defined microstructure monolayer. reproducibility...
A novel D-A1-D-A2-type polymer that exhibits a small bandgap of 1.43 eV yet still yields solar cells with high open-circuit voltage (VOC) 0.81 V and power conversion efficiencies up to 8.63% is reported. Comparable can be achieved even when the active layer processed in air or after it thermally annealed at 150 °C. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may re-organized for online delivery, but not...
Abstract The device performance of polymer solar cells (PSCs) is strongly dependent on the blend morphology. One strategies for improving PSC side‐chain engineering, which plays an important role in controlling aggregation properties polymers and thus domain crystallinity/purity donor–acceptor blends. In particular, a family high‐performance donor with strong temperature‐dependent properties, performances are very sensitive to size alkyl chains, best can only be achieved optimized...
Non-fullerene acceptors (NFAs) are becoming a serious contender to fullerene-based electron in organic photovoltaics, due their structural versatility and easily tunable optical electronic properties.
The position of methyl groups causes a dramatic change in molecular properties and solar cell performance.