A5063502436- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- 2D Materials and Applications
- Luminescence and Fluorescent Materials
- Microwave Dielectric Ceramics Synthesis
- Nanoplatforms for cancer theranostics
- Electronic and Structural Properties of Oxides
- Organic Electronics and Photovoltaics
- Polydiacetylene-based materials and applications
- Copper-based nanomaterials and applications
- Optical properties and cooling technologies in crystalline materials
- Organic and Molecular Conductors Research
- ZnO doping and properties
- Neural Networks and Reservoir Computing
- Advanced Thermoelectric Materials and Devices
- Thermal properties of materials
- Ga2O3 and related materials
- Thermal Expansion and Ionic Conductivity
- GaN-based semiconductor devices and materials
- Liquid Crystal Research Advancements
- stochastic dynamics and bifurcation
University of Cambridge
2018-2025
Sichuan University
2025
West China Hospital of Sichuan University
2025
Massachusetts Institute of Technology
2025
Cavendish Hospital
2023-2024
Beijing Normal University
2013
Chinese Academy of Sciences
2002
Abstract Metal halide perovskite semiconductors have demonstrated remarkable potentials in solution‐processed blue light‐emitting diodes (LEDs). However, the unsatisfied efficiency and spectral stability responsible for trap‐mediated non‐radiative losses phase segregation remain primary unsolved challenges LEDs. In this study, it is reported that a fluorene‐based π‐conjugated cationic polymer can be blended with semiconductor to control film formation optoelectronic properties. As result,...
Abstract Solar fuels offer a promising approach to provide sustainable by harnessing sunlight 1,2 . Following decade of advancement, Cu 2 O photocathodes are capable delivering performance comparable that photoelectrodes with established photovoltaic materials 3–5 However, considerable bulk charge carrier recombination is poorly understood still limits further advances in 6 Here we demonstrate beyond the state-of-the-art exploiting new conceptual understanding and transport single-crystal...
Abstract Polarized light is critical for a wide range of applications, but usually generated by filtering unpolarized light, which leads to substantial energy losses and requires additional optics. Here we demonstrate the direct emission linearly polarized from light-emitting diodes made CsPbI 3 perovskite nanoplatelet superlattices. The use solvents with different vapour pressures enables self-assembly nanoplatelets fine control over their orientation (either face-up or edge-up) therefore...
Colloidal lead-halide perovskite nanocrystals (LHP NCs) have emerged over the past decade as leading candidates for efficient next-generation optoelectronic devices, but their properties and performance critically depend on how they are purified. While antisolvents widely used purification, a detailed understanding of polarity antisolvent influences surface chemistry composition NCs is missing in field. Here, we fill this knowledge gap by studying purified CsPbBr
Abstract Halide double perovskites have gained significant attention, owing to their composition of low‐toxicity elements, stability in air, and recent demonstrations long charge‐carrier lifetimes that can exceed 1 µs. In particular, Cs 2 AgBiBr 6 is the subject many investigations photovoltaic devices. However, efficiencies solar cells based on this perovskite are still far from theoretical efficiency limit material. Here, role grain size optoelectronic properties thin films investigated....
I-V-VI2 ternary chalcogenides are gaining attention as earth-abundant, nontoxic, and air-stable absorbers for photovoltaic applications. However, the semiconductors explored thus far have slowly-rising absorption onsets, their charge-carrier transport is not well understood yet. Herein, we investigate cation-disordered NaBiS2 nanocrystals, which a steep onset, with coefficients reaching >105 cm-1 just above its pseudo-direct bandgap of 1.4 eV. Surprisingly, also observe an ultrafast...
The family of hybrid organic-inorganic lead-halide perovskites are the subject intense interest for optoelectronic applications, from light-emitting diodes to photovoltaics X-ray detectors. Due inert nature most organic molecules, inorganic sublattice generally dominates electronic structure and therefore properties perovskites. Here, we use optically electronically active carbazole-based Cz-Ci where Ci indicates an alkylammonium chain i number CH2 units in chain, varying 3 5, as cations...
Photoinduced enhanced Raman spectroscopy (PIERS) is a new surface (SERS) modality with 680% signal enhancement of adsorbed analytes over that SERS. Despite the explosion in recent demonstrations, PIERS mechanism remains undetermined. Using X-ray and time-resolved optical spectroscopies, electron microscopy, cyclic voltammetry, density functional theory simulations, we elucidate atomic-scale behind PIERS. Stable substrates were fabricated using self-organized arrays TiO2 nanotubes controlled...
Understanding and control of ultrafast non-equilibrium processes in semiconductors is key to making use the full photon energy before relaxation, leading new ways break efficiency limits for solar conversion. In this work, we demonstrate observation modulation slow relaxation uniformly mixed tin-lead perovskites (MASnxPb1-xI3 CsSnxPb1-xI3 nanocrystals). Transient absorption measurements reveal that cooling mediated by a hot phonon bottleneck effect appears at carrier densities above ~1018...
Abstract Defect tolerance is a critical enabling factor for efficient lead-halide perovskite materials, but the current understanding primarily on band-edge (cold) carriers, with significant debate over whether hot carriers can also exhibit defect tolerance. Here, this important gap in field addressed by investigating how intentionally-introduced traps affect carrier relaxation CsPbX 3 nanocrystals (X = Br, I, or mixture). Using femtosecond interband and intraband spectroscopy, along...
Abstract Solution‐processable near‐infrared (NIR) photodetectors are urgently needed for a wide range of next‐generation electronics, including sensors, optical communications and bioimaging. However, it is rare to find with >300 kHz cut‐off frequencies, especially in the NIR region, many emerging inorganic materials explored comprised toxic elements, such as lead. Herein, solution‐processed AgBiS 2 high frequencies under both white light (>1 MHz) (approaching 500 kHz) illumination...
Solution processing of hybrid perovskite semiconductors is a highly promising approach for the fabrication cost-effective electronic and optoelectronic devices. However, challenges with this lie in overcoming controllability film morphology reproducibility device efficiencies. Here, facile practical aging treatment (AT) strategy reported to modulate crystal growth produce sufficiently high-quality thin films improved homogeneity full-coverage morphology. The resulting AT-films exhibit fewer...
Abstract Emerging functional materials such as halide perovskites are intrinsically unstable, causing long-term instability in optoelectronic devices made from these materials. This leads to difficulty capturing useful information on device degradation through time-consuming optical characterization their operating environments. Despite challenges, understanding the mechanism is crucial for advancing technology towards commercialization. Here we present a self-supervised machine learning...