A5008504116- Perovskite Materials and Applications
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Crystallization and Solubility Studies
- Quantum Dots Synthesis And Properties
- X-ray Diffraction in Crystallography
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Metallurgy and Material Forming
- Molecular Junctions and Nanostructures
- Metal Forming Simulation Techniques
- Chalcogenide Semiconductor Thin Films
- Planarian Biology and Electrostimulation
- Solid-state spectroscopy and crystallography
- Plant and Biological Electrophysiology Studies
- Advanced Battery Materials and Technologies
- 3D Printing in Biomedical Research
- Advanced Photocatalysis Techniques
- Advanced battery technologies research
- TiO2 Photocatalysis and Solar Cells
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Semiconductor materials and interfaces
- Advancements in Battery Materials
- Advanced Fiber Laser Technologies
City University of Hong Kong
2020-2025
Quzhou University
2024
University of Manitoba
2020-2023
University of Washington
2015-2022
University of California, Davis
2020-2022
National University of Singapore
2019-2021
Seattle University
2017-2020
Kowloon Hospital
2020
University of California, Los Angeles
2017
Chinese Academy of Sciences
2017
Recently, researchers have focused on the design of highly efficient flexible perovskite solar cells (PVSCs), which enables implementation portable and roll-to-roll fabrication in large scale. While NiOx is a promising material for hole transport layer (HTL) candidate fabricating PVSCs rigid substrate, reported HTLs are formed using different multistep treatments (such as 300–500 °C annealing, O2-plasma, UVO, etc.), hinders development based NiOx. Meanwhile, features nanostructured...
Passivating surface and bulk defects of perovskite films has been proven to be an effective way minimize nonradiative recombination losses in solar cells (PVSCs). The lattice interference perturbation atomic periodicity at the surfaces often significantly affect material properties device efficiencies. By tailoring terminal groups on modifying chemical environment, can reduced enhance photovoltaic performance stability derived PVSCs. Here, we report a rationally designed bifunctional...
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...
Two cheliform non-fullerene acceptors, DTPC-IC and DTPC-DFIC, based on a highly electron-rich core, dithienopicenocarbazole (DTPC), are synthesized, showing ultra-narrow bandgaps (as low as 1.21 eV). The two-dimensional nitrogen-containing conjugated DTPC possesses strong electron-donating capability, which induces intense intramolecular charge transfer intermolecular π–π stacking in derived acceptors. solar cell DTPC-DFIC spectrally complementary polymer donor, PTB7-Th, showed high power...
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...
In this paper, two near-infrared absorbing molecules are successfully incorporated into nonfullerene-based small-molecule organic solar cells (NFSM-OSCs) to achieve a very high power conversion efficiency (PCE) of 12.08%. This is achieved by tuning the sequentially evolved crystalline morphology through combined solvent additive and vapor annealing, which mainly work on ZnP-TBO 6TIC, respectively. It not only helps improve crystallinity 6TIC blend, but also forms multilength scale enhance...
Despite the significant progresses made in all-polymer solar cells (all-PSCs) recently, relatively low short-circuit current density (Jsc) and large energy loss are still quite difficult to overcome for further development. To address these challenges, we developed a new class of narrow-bandgap polymer acceptors incorporating benzotriazole (BTz)-core fused-ring segment, named PZT series. Compared commonly used benzothiadiazole (BT)-containing PYT, less electron-deficient BTz renders...
Three new tailor-made molecules (DPDCTB, DPDCPB, and DTDCPB) were strategically designed convergently synthesized as donor materials for small-molecule organic solar cells. These compounds possess a donor-acceptor-acceptor molecular architecture, in which various electron-donating moieties are connected to an electron-withdrawing dicyanovinylene moiety through another electron-accepting 2,1,3-benzothiadiazole block. The structures crystal packings of DTDCPB the previously reported DTDCTB...
A novel donor-acceptor-acceptor (D-A-A) donor molecule, DTDCTB, in which an electron-donating ditolylaminothienyl moiety and electron-withdrawing dicyanovinylene are bridged by another electron-accepting 2,1,3-benzothiadiazole block, has been synthesized characterized. vacuum-deposited organic solar cell employing DTDCTB combined with the electron acceptor C(70) achieved a record-high power conversion efficiency (PCE) of 5.81%. The respectable PCE is attributed to spectral response extending...
Two novel non-fullerene acceptors, SN6IC and SN6IC-4F, based on an S,N-heteroacene backbone were designed synthesized. The cyclopentadiene fragments of commonly used acceptors replaced with pyrrole rings to improve the electron-donating ability increase energy levels molecules. Both match well absorption polymer donor PBDB-T, PBDB-T:SN6IC-4F-based solar cells showed excellent power conversion efficiency 13.2%, a relatively small VOC loss 0.54 eV. This study proves that introduction nitrogen...
A new, all room-temperature solution process is developed to fabricate efficient, low-cost, and stable perovskite solar cells (PVSCs). The PVSCs show high efficiency of 17.10% 14.19%, with no hysteresis on rigid flexible substrates, respectively, which are the best efficiencies reported date for fabricated by solution-processed techniques. a remarkable power-per-weight 23.26 W g−1.
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...
A fused-ring thiophene-thieno[3,2-b]thiophene-thiophene (4T)-based low-band gap electron acceptor, 4TIC, has been designed and synthesized for non-fullerene solar cells. The utilization of the 4T center core enhances charge mobility 4TIC extends its absorption band edge to ∼900 nm, which facilitates function as a very efficient acceptor. rigid, π-conjugated framework also offers lower reorganization energy facilitate VOC loss. Femtosecond transient spectroscopy showed level polaron...
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,...
Carbazole-derived self-assembled monolayers (SAMs) are promising hole-selective materials for inverted perovskite solar cells (PSCs). However, they often possess small dipoles which prohibit them from effectively modulating the workfunction of ITO substrate, limiting PSC photovoltage. Moreover, their properties can be drastically affected by even subtle structural modifications, undermining final performance. Here, we designed two carbazole-derived SAMs, CbzPh and CbzNaph through asymmetric...
Abstract All‐polymer solar cells (all‐PSCs) progressed tremendously due to recent advances in polymerized small molecule acceptors (PSMAs), and their power conversion efficiencies (PCEs) have exceeded 15 %. However, the practical applications of all‐PSCs are still restricted by a lack PSMAs with broad absorption, high electron mobility, low energy loss, good batch‐to‐batch reproducibility. A multi‐selenophene‐containing PSMA, PFY‐3Se, was developed based on selenophene‐fused SMA framework...
Self-assembled monolayers (SAMs) have been widely employed as an effective way to modify interfaces of electronic/optoelectronic devices. To achieve a good control the growth and molecular functionality SAMs, we develop co-assembled monolayer (co-SAM) for obtaining efficient hole selection suppressed recombination at hole-selective interface in inverted perovskite solar cells (PSCs). By engineering position methoxy substituents, aligned energy level favorable dipole moment can be obtained...
Abstract Y6, as a state‐of‐the‐art nonfullerene acceptor (NFA), is extensively optimized by modifying its side chains and terminal groups. However, the conformation effects on molecular properties photovoltaic performance of Y6 derivatives have not yet been systematically studied. Herein, three analogs, namely, BP4T‐4F, BP5T‐4F, ABP4T‐4F, are designed synthesized. Owing to asymmetric design strategies, representative conformations for Y6‐type NFAs obtained through regulating lateral...