A5022573802- Luminescence and Fluorescent Materials
- Photochemistry and Electron Transfer Studies
- Porphyrin and Phthalocyanine Chemistry
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Spectroscopy and Quantum Chemical Studies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Quantum Dots Synthesis And Properties
- Membrane Separation Technologies
- Chalcogenide Semiconductor Thin Films
- Advanced Fluorescence Microscopy Techniques
- Photoreceptor and optogenetics research
- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Catalytic Processes in Materials Science
- Advanced Nanomaterials in Catalysis
- Nanocluster Synthesis and Applications
- Advanced Photocatalysis Techniques
- 2D Materials and Applications
- Molecular Junctions and Nanostructures
- Molecular Sensors and Ion Detection
- Surface Modification and Superhydrophobicity
Beijing Normal University
2018-2025
Chinese Academy of Sciences
2009-2025
Xiamen Institute of Rare-earth Materials
2024-2025
Fujian Institute of Research on the Structure of Matter
2024-2025
Xihua University
2021-2024
The University of Texas at Arlington
2022-2023
Beijing Institute of Nanoenergy and Nanosystems
2023
Nanyang Technological University
2023
Nanchang University
2023
University of Chinese Academy of Sciences
2023
Extraction of photoexcited charge carriers transported up to 600 nanometers in CH 3 NH PbI could boost solar cell efficiency.
Charge carrier diffusion coefficient and length are important physical parameters for semiconducting materials. Long-range in perovskite thin films has led to remarkable solar cell efficiencies; however, spatial temporal mechanisms of charge transport remain unclear. Here we present a direct measurement space time by mapping density with simultaneous ultrafast resolution ∼50-nm precision using transient absorption microscopy. These results directly visualize long-range ∼220 nm 2 ns...
Charge-transfer transitions enhance carrier generation at the interfaces of two-dimensional heterostructures.
Abstract Side‐chain engineering has been an effective strategy in tuning electronic energy levels, intermolecular interaction, and aggregation morphology of organic photovoltaic materials, which is very important for improving the power conversion efficiency (PCE) solar cells (OSCs). In this work, two D–A copolymers, PBQ5 PBQ6, are designed synthesized based on bithienyl‐benzodithiophene (BDTT) as donor (D) unit, difluoroquinoxaline (DFQ) with different side chains acceptor (A) thiophene...
Ultrafast microscopy reveals mobile charge-transfer excitons at two-dimensional organic-inorganic interfaces.
In order to find a way induce rooting on cuttings of Hemarthria compressa cv. Ya’an under controlled conditions, project was carried out study the effect naphthalene acetic acid (NAA) in stem and related physiological changes during process compressa. The were treated with five concentrations NAA (0, 100, 200 300, 400 mg/l) at three soaking durations (10, 20, 30 minutes), without treatment considered as control. Samples planted immediately into pots after treatment. IAA-oxidase (IAAO)...
An efficient method for the synthesis of 3-tertiary alkylated 1,1-difluorostyrene derivatives<italic>via</italic>Cu-catalyzed alkylation α-(trifluoromethyl)styrenes with tertiary alkylmagnesium reagents at room temperature was developed.
Abstract Recently, a random ternary copolymerization strategy has become promising and efficient approach to develop high‐performance polymer donors for solar cells (PSCs). In this study, low‐cost electron‐withdrawing unit, 2,5‐bis(4‐(2‐ethylhexyl)thiophen‐2‐yl)pyrazine (PZ‐T), is incorporated into the backbone of PM6 as third component, three D‐A 1 ‐D‐A 2 type terpolymers PMZ‐10, PMZ‐20, PMZ‐30 are synthesized by strategy, with PZ‐T proportion 10%, 20%, 30%, respectively. The exhibit...
It is an obstacle to precisely manipulate a doped heteroatom into desired position in metal nanocluster. Herein, we overcome this difficulty obtain Pt1 Au37 (SCH2 Pht Bu)24 and Pt2 Au36 nanoclusters via controllably doping Pt atoms the kernels of Au38 . We reveal that asymmetrical one atom either cores elevates relative energy HOMO (highest occupied molecular orbital) accompanied by valence electron loss , compared with 14 electrons, while symmetrical two narrows HOMO-LUMO gap (LUMO: lowest...
Several important photophysical properties of the cyanine dye Cy3 have been determined by laser flash photolysis. The triplet-state absorption and photoisomerization are distinguished using heavy-atom effects oxygen-induced triplet → energy transfer. Furthermore, extinction coefficient quantum yield also measured via triplet−triplet energy-transfer method comparative actinometry, respectively. It is found that (T1→Tn) absorptions trans-Cy3 largely overlap ground-state cis-Cy3. Unlike what...
Long-range exciton transport is a key challenge in achieving efficient solar energy harvesting both organic cells and photosynthetic systems. Self-assembled molecular aggregates provide the potential for attaining long-range through strong intermolecular coupling. However, there currently lacks an experimental tool to directly characterize space time elucidate mechanisms. Here we report direct visualization of diffusion tubular by transient absorption microscopy with ∼200 fs resolution ∼50...
By direct imaging of singlet and triplet populations with ultrafast microscopy, it is shown that the diffusion length fission yield can be simultaneously optimized for tetracene its derivatives, making them ideal structures application in bilayer solar cells.
A novel donor-π-acceptor-π-donor-type (D-π-A-π-D-type) chromophore, 2,6-bis[4-(diphenylamino)phenyl]-9,10-anthraquinone (AQ(PhDPA)2), has been reported as an efficient red thermally activated delayed fluorescence (TADF) emitter. Molecular structure and conformation, which directly determine the nature of excited states a TADF emitter, are critical for obtaining reverse intersystem crossing (rISC) TADF. In this work, series excited-state deactivation processes AQ(PhDPA)2, from optical...
As one of the most promising nonfullerene acceptors for organic photovoltaics, perylene diimide (PDI)-based multibranched molecules with twisted or three-dimensional (3D) geometric structures have been developed, which effectively increase power conversion efficiency (PCE) solar cells. Understanding structure–property relationships in multichromophoric molecular architectures at and ultrafast time levels is a crucial step establishing new design principles electronic materials. For this,...
Membrane technology is a key enabler for circular pharmaceutical industry, but chemically resistant polymeric membranes organic solvent nanofiltration (OSN) often suffer from lower-than-required performances. Recently, graphene-based laminated using small-flake graphene oxide (SFGO) nanosheets open up new avenues high-performance OSN, their permeance toward high viscosity solvents below expectation. To address this issue, we design hyperlooping channels multiwalled carbon nanotubes (MWCNTs)...
Non-radiative decay of orange–red TADF emitters are strongly associated with excited-state structural relaxation through promoting vibrational modes, for which external restraint is critical achieving high OLED emitting efficiency.
Abstract The defects in perovskite film can cause charge carrier trapping which shortens lifetime and diffusion length. So passivation has become promising for the studies. However, how disturb transport passivating affects CsPbBr 3 are still unclear. Here dynamics processes of LiBr passivated films investigated by using transient absorption spectroscopy microscopy. It's found that there is a fast hot process with above bandgap excitation, would decrease population cold carriers diffusible,...
ConspectusLong-range transport of Frenkel excitons is crucial for achieving efficient molecular-based solar energy harvesting. Understanding exciton mechanisms important designing materials applications. One major bottleneck in unraveling the lack direct measurements to provide information both spatial and temporal domains, imposed by combination fast transfer (typically ≤1 ps) short diffusion lengths ≤100 nm). This challenge requires developing experimental tools directly characterize...
Singlet fission provides a promising route for overcoming the Shockley–Queisser limit in solar cells using organic materials. Despite singlet dynamics having been extensively investigated, transport of various intermediates relation to and triplet states is largely unknown. Here we employ temperature-dependent ultrafast transient absorption microscopy image single crystals tetracene. These measurements suggest mobile intermediate state at low temperatures, with diffusion constant 36 cm2s–1 5...
Abstract Modulating photophysical processes is a fundamental way for tuning performance of many organic devices. However, it has not been explored as an effective strategy to manipulate the thermoelectric (TE) conversion semiconductors (OSCs) owing their critical requirement carrier concentration (>10 18 cm −3 ) and fact low exciton separation efficiency in single element OSCs. Here, electric field modulated photo‐thermoelectric (P‐TE) effect n‐type OSC demonstrated realize significant...