A5011921321- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Chalcogenide Semiconductor Thin Films
- High-pressure geophysics and materials
- Organic and Molecular Conductors Research
- ZnO doping and properties
- Electronic and Structural Properties of Oxides
- Nuclear Materials and Properties
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Advanced Chemical Physics Studies
- Advanced Thermoelectric Materials and Devices
- Copper-based nanomaterials and applications
- Crystallography and molecular interactions
- Boron and Carbon Nanomaterials Research
- X-ray Diffraction in Crystallography
- Hydrogen Storage and Materials
- Optical properties and cooling technologies in crystalline materials
- Thermal and Kinetic Analysis
- Crystal Structures and Properties
- TiO2 Photocatalysis and Solar Cells
- Energetic Materials and Combustion
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Iron-based superconductors research
Minzu University of China
2021-2023
Inner Mongolia University for Nationalities
2018-2023
Jilin University
2016-2019
State Key Laboratory of Superhard Materials
2016-2019
Texas Tech University
2018
Jilin Medical University
2016
Recent scientific advances on organic-inorganic hybrid perovskites are mainly focused the improvement of power conversion efficiency. So far, how compression tunes their electronic and structural properties remains less understood. By combining in situ photocurrent, impedance spectroscopy, X-ray diffraction (XRD) measurements, we have studied electrical transport compressed CH3NH3PbI3 (MAPbI3) nanorods. The visible light response MAPbI3 robust below 3 GPa while it is suppressed when becomes...
The electrical transport properties of CH3NH3PbBr3 (MAPbBr3) polycrystals were in situ investigated by alternating-current impedance spectroscopy under high pressures up to 5.6 GPa. It is confirmed that ionic and electronic conductions coexist MAPbBr3. As pressure below 3.3 GPa ions migration the predominant process, while above conduction becomes main process. An obvious ionic-electronic transition can be observed. dependent photo responsiveness MAPbBr3 was also studied photocurrent...
Hybrid solar cells with organometal halide perovskites have already reached a power conversion efficiency exceeding 22.1%, but their toxic lead component remains serious concern. Hence, the replacement of nontoxic alternatives, such as tin, has attracted increasing interest. This study investigates structural and optoelectronic properties perovskite methylammonium tin chloride (MASnCl3, MA: CH3NH3) under pressure. The synchrotron X-ray diffraction experiment shows that sample transforms from...
Pressure effects on the ionic transport and optoelectrical properties of lead halide perovskites are still largely terra incognita. Herein, we have conducted in situ alternating current (AC) impedance spectroscopy both CsPbBr3 powders single crystals with random planes at pressures up to 9.2 GPa 6.8 GPa, respectively. Through selection different simulation equivalent circuit models AC spectroscopy, obtained pressure-dependent electrical parameters CsPbBr3. The results indicate that all...
Pressure has an essential role in the control of both photo-responsive and electrical transport properties halide perovskites. As a lead-free double perovskite material, (NH4)2SeBr6, which avoids use toxic lead element, become ideal candidate for application photovoltaic photoelectric devices. In this paper, response (NH4)2SeBr6 have been studied by photocurrent alternating current impedance spectroscopy measurements under high pressure up to 21.2 GPa, respectively. The results indicate that...
Abstract The electrical transport and structural properties of tin oxide nanoparticles under compression have been studied by in situ impedance measurements synchrotron X-ray diffraction (XRD) up to 27.9 GPa. It was found that the conduction SnO 2 can be improved significantly with compression. Abnormal variations resistivity, relaxation frequency, relative permittivity were observed at approximately 12.3 25.0 GPa, which attributed pressure-induced tetragonal- orthorhombic-cubic transitions....
Further efficiency boost of organic-inorganic perovskite solar cells is hampered by limited knowledge on ion migration, inductive loops, and the relationship between structures properties in organometal halide perovskites. In this work, situ alternating current impedance spectroscopy measurements CH(NH2)2PbBr3 (FAPbBr3) have been carried out under high pressure up to 4.8 GPa. The loop has discovered at low frequencies can be tuned dramatically applying pressure, which attributed large FA...
The heavier alkaline-earth hydrides AeH2 (Ae = Ca, Sr, and Ba) are considered as promising materials for hydrogen energy storage. Pressure-induced structural changes in could improve transport properties result a better understanding of the structure-property relationship. In this work, pressure evolution carrier SrH2 was investigated using impedance spectroscopy measurements at room temperature first-principles calculations. pressure-induced structure phase transition from Pnma to P63/mmc...
We present a novel technique for controlling oxygen fugacity, which is broadly used to in-situ measure the electrical conductivities in minerals and rocks during diamond anvil cell experiments. The of olivine are determined under controlled fugacity conditions (Mo–MoO 2 ) at pressures up 4.0 GPa temperatures 873 K. advantages this new enable measuring activation enthalpy, energy, bulk volume Arrhenius relationship. This provides an improved understanding mechanism conduction olivine....
The pressure-induced phase transitions of bromine chloride (BrCl) were studied using the CALYPSO structure prediction method and first-principles calculations. Geometry optimization showed that BrCl underwent following under high pressure: Cmcm → C2/m Fddd P4/mmm. These occurred at 75, 94, 140 GPa, respectively. All four phases calculated to be dynamically stable, judging by absence any imaginary phonon modes in whole Brillouin zone. As pressure increased, number bonds between Br atom...
Abstract Nanorod is a unique low-dimensional nanometer structure in which the Landau level arrangement of polaron essential for understanding its quasiparticle system. However, stability susceptible to external factors, such as changing magnetic fields. In this manuscript, Pekar variational method employed calculate field’s effect on nanorod’s level. It was found that different fields have effects energy levels nanorod, demonstrated environment had critical levels. This study provides...
Abstract The CdS layer was essential for CdSe quantum dot-sensitized solar cells (QDSSCs) as the seed and energy barrier. Here, a novel sol–gel method employed to prepare interlayer (SG-CdS) TiO 2 nanorod-based QDSSCs. Due sufficient reaction of Cd S sources in solution, SG-CdS exhibited fewer impurities than produced by commonly used chemical bath deposition (CBD-CdS). QDSSCs with an open-circuit voltage 490 mV, short-circuit current density 14.12 mA cm −2 , fill factor 0.35. power...