A5103107368- Perovskite Materials and Applications
- nanoparticles nucleation surface interactions
- High Temperature Alloys and Creep
- Quantum Dots Synthesis And Properties
- Surface and Thin Film Phenomena
- Chalcogenide Semiconductor Thin Films
- Microstructure and mechanical properties
- High-Temperature Coating Behaviors
- Microstructure and Mechanical Properties of Steels
- Advanced Materials Characterization Techniques
- Solidification and crystal growth phenomena
- Conducting polymers and applications
- Aluminum Alloy Microstructure Properties
- Electronic and Structural Properties of Oxides
- Catalytic Processes in Materials Science
- Copper Interconnects and Reliability
- Semiconductor materials and devices
- Force Microscopy Techniques and Applications
- Topological Materials and Phenomena
- Nanowire Synthesis and Applications
- Graphene research and applications
- Aluminum Alloys Composites Properties
- Quantum many-body systems
- Chemical and Physical Properties of Materials
- Fatigue and fracture mechanics
Beijing University of Technology
2021-2025
Sun Yat-sen University
2005-2024
Shenzhen Polytechnic
2023-2024
State Key Laboratory of Optoelectronic Materials and Technology
2005-2009
Hunan Normal University
2009
Grain boundaries (GBs) play an important role in the mechanical behavior of polycrystalline materials. Despite decades investigation, atomic-scale dynamic processes GB deformation remain elusive, particularly for GBs polycrystals, which are commonly asymmetric and general type. We conducted situ atomic-resolution study to reveal how sliding-dominant is accomplished at tilt platinum bicrystals. observed either direct sliding along or with atom transfer across boundary plane. The latter...
Narrow-bandgap Sn-Pb alloying perovskites showcased great potential in constructing multiple-junction perovskite solar cells (PSCs) with efficiencies approaching or exceeding the Shockley-Queisser limit. However, uncontrollable surface metal abundance (Sn
Abstract Tin‐based perovskite solar cells (Sn‐PSCs) have emerged as promising environmentally viable photovoltaic technologies, but still suffer from severe non‐radiative recombination loss due to the presence of abundant deep‐level defects in film and under‐optimized carrier dynamics throughout device. Herein, we healed structural imperfections Sn perovskites an “inside‐out” manner by incorporating a new class biocompatible chelating agent with multidentate claws, namely, 2‐Guanidinoacetic...
The step and ramp heat treatments can improve the homogenization degree of structure in superalloys. However, comparison between them using same temperate range total holding time on microstructure microstructural stability is still vague. effects treatment solution temperature hold a third-generation superalloy were studied. sizes γ′ phases at dendrite cores edges are different, which caused by dissolution phase during treatment. A low aggravates dendritic segregation. Dendrite segregation...
Abstract Photoactive black‐phase formamidinium lead triiodide (α‐FAPbI 3 ) perovskite has dominated the prevailing high‐performance solar cells (PSCs), normally for those spin‐coated, conventional n‐i‐p structured devices. Unfortunately, α‐FAPbI not been made full use of its advantages in inverted p‐i‐n PSCs fabricated via blade‐coating techniques owing to uncontrollable crystallization kinetics and complicated phase evolution FAPbI perovskites during film formation. Herein, a customized...
An analytical model has been developed for the size-induced strain and stiffness of a nanocrystal from perspective thermodynamics continuum medium mechanics. A core-shell structure with surface skin shell an atomic diameter considered structure. Contribution chemical structural effects to energy also considered. It found that elastic modulus increases inverse crystal size vibration frequency is higher than bulk. The theoretical predictions are consistent experimental observations.
There is a standing fundamental issue of topological insulators that their theoretically predicted nanoscaled metallic surface state (3–5 nm) has never been demonstrated substantially by experiments. We have designed an experiment to clarify this measuring the surface-state and bulk-state resistances Bi2Te3 Sb2Te3 thin films. Interestingly, we found measured resistivity lower than 5 orders magnitude, which indicated metallic. Further, decrease monotonically with temperature decreasing from...
In this work, the effect of directional solidification methods on solid solution windows in two Ni-based single-crystal superalloys is investigated. The sample prepared using liquid metal cooling (LMC) method was found to contain smaller dendrite spacing, lower segregation and eutectic, a size γ′ phase than that high-speed rapid (HRS) method. alloy-2 contained higher Cr, Co lowered Re exhibited similar spacing volume fraction other alloy-1. treatment window broadened by adopting LMC or...
Ionic liquids (ILs) have emerged as versatile tools for interfacial engineering in perovskite photovoltaics. Their multifaceted application targets defect mitigation at SnO
A universal and analytic thermodynamic model without any adjustable parameters was established to elucidate the interface energy of multilayers at nanometer scale by taken size effect, interfacial orientation, mismatch into account. Theoretical predictions were consistent with calculations modified analytical embedded atom method experimental data, implying that proposed could be expected a general approach on nanoscale understand in binary systems.
Due to current issues of energy-level mismatch and low transport efficiency in commonly used electron layers (ETLs), such as TiO
Sn-based perovskites have emerged as one of the most promising environmentally-friendly photovoltaic materials. Nonetheless, low-cost production and stable operation perovskite solar cells (PSCs) are still limited by costly hole transport layer (HTL) under-optimized interfacial carrier dynamics. Here, we innovatively developed a halogen radical chemical bridging strategy that enabled to remove HTL optimize perovskite-substrate heterointerface for constructing high-performance, simplified...
In order to gain a better understanding of the interfacial alloying in binary immiscible metallic mutilayers, we established size-dependent kinetic model address diffusion that takes place at interface bilayer on nanoscale, and found an abnormal behavior when length less than 2 nm. The nanosize-dependent coefficients metals bilayers were predicted basis proposed model. Taking Cu–Ta multilayers as example, showed these theoretical predictions are agreement with experiments computational simulations.
We describe formation of Fe nanowires with varying widths at the upper step edges on a vicinal Cu (111) surface via kinetic Monte Carlo simulations basis decoration effects. The existence an optimal temperature and deposition flux for well-ordered stepped is found. physical origin surfaces pursued.
We propose a kinetic model to reveal the origin of unusual rapid oxidation behavior for ultrathin (<2 nm) silicon demonstrated by [Enta et al., Appl. Phys. Lett. 92, 012110 (2008)] considering space-charge drift O ions and intrinsic concentration gradient diffusion residual that dominate initial process following slow state, respectively. Importantly, present well describes whole experiment data with different temperatures pressures activation energies two regimes attained our model,...
To have a clear insight into the physical origin of anomalous initial oxidation behavior for silicon oxidation, we proposed kinetics model by introducing nanosize effect process. The rate equation oxide growth was calculated based on our model, and these results are in excellent agreement with experiments. Notably, present not only bridges breakdown Deal–Grove [B. E. Deal A. S. Grove, J. Appl. Phys. 36, 3770 (1965)] region but also accurately describes process whole regions over wide...
Sink-effect of nanocavities in a host crystal to metallic impurity atoms is proposed on the basis established thermodynamic and kinetic approach at nanometer scale. The trapping mechanisms are attributed contact epitaxy inner surface diffusion flux pointing nanocavities. These theoretical results exhibit that nanocavity as functional unit could be used fabricate nanodevices.
The addition of Ru can increase the endurance temperature and rupture life in Ni-based single crystal superalloys. This study investigates effect microstructural degradation on overtemperature performance Ru-containing degraded microstructure consists γ′-γ phase, TCP phase dislocations. mainly causes reduction life. With Ru, changes from higher to lower with increasing temperature. mechanisms these behaviors are clarified. precipitation 3Ru alloy reduces In 5Ru alloy, evolution dislocations...