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Meeting Materials Science & Technology 2020
Symposium Emergent Materials under Extremes and Decisive In Situ Characterizations
Presentation Title Giant Pressure-induced Enhancements in Electronic Transport and Photoelectric Properties in 2D and 3D Structures
Author(s) Wenge Yang
On-Site Speaker (Planned) Wenge Yang
Abstract Scope Layered chalcogenides have been considered as excellent candidates for superconductor and thermoelectricity applications. The pressure-driven 2D–3D structural reconstruction is an efficient strategy for tuning the electronic configuration and optical properties. With aids of in situ structural, optical and electronic characterizations, we uncovered the giant enhancements in the electronic transport and phototelectric properties with the pressure tuning effect on this layered materials. Comparing the pressure induced structure phase transition in many 3D materials, the pressure-driven buckling effect on the layered bismuth oxysulfide Bi9O7.5S6 is significent. Under pressure, the layer and bonding distances between and within BiO and BiS layer change dramatically, which drives the enhancements of electric conductivity by 6 orders of magnitude, increasing of photocurrent by 4 orders of magnitude, and significant narrowing down of band gap from 1.34 to 0.45 eV. These findings may open up a new avenue for discovering and designing high-efficiency photodetectors and energy-harvesting materials.


Characterizing Disordered Crystalline Materials with Pauling’s Rules
Evolution of Structure, Electrical, and Optical Properties in Ti-doped In2O3 Nanocrystals under Pressure
Giant Pressure-induced Enhancements in Electronic Transport and Photoelectric Properties in 2D and 3D Structures
High-speed X-ray Phase Contrast Imaging Analysis of Microscale Shock Response of a Mock Additively Manufactured Energetic Material
High Pressure & Temperature Investigation into Thorium Orthosilicates
Investigations of Materials under Extreme Hydrothermal Conditions Using Synchrotron and Complementary Techniques
Technology Development of In-situ Corrosion Kinetics and Salt Property Measurements

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