Search

The electrical transport properties of indium trisulfide (In2S3) under high pressure were investigated using the in situ Hall-effect and temperature dependent resistivity measurements. Resistivity, Hall coefficient, carrier concentration, and mobility were obtained at pressures up to 41.6 GPa. Pressure induced metallization of In2S3 occurred at approximately 6.8 GPa. This was determined by measuring temperature dependent resistivity. The metallization transition was also determined from compression electrical parameters, and the decompression electrical parameters indicated that the metallization was a reversible transition. The main cause of the sharp decline in resistivity was the increase in carrier concentration at 6.8 GPa. Superconductivity was not observed at the pressures (up to 32.5 GPa) and temperatures (100–300 K) used in the experiment. [ABSTRACT FROM AUTHOR]

Aiming at the traditional single-needle electrospinning technology, a novel system for the efficient production of multi-production nanofibers through electrospinning is reported. The polymer solution is delivered to the liquid tank, and when the applied voltage exceeds a certain value, a plurality of nozzles is formed. In this paper, the electric field distribution of pinhole cylindrical spinneret structure is studied by simulating the electric field intensity with finite element software. The diameter and yield of the nanofibers were investigated by varying the center electrode voltage and the annular collector radius. The results show that the diameter and productivity of nanofibers are affected by the electric field intensity around the spinneret. Increasing the applied voltage and collecting distance has some significant effect on the diameter of nanofibers. The diameter of nanofibers increases with the concentration of the solution. The maximum yield of nanofibers is 3.1 g/h. It is noteworthy that this method not only greatly improves productivity but also significantly reduces the influence of solvent evaporation during electrospinning. This spinning method provides support for large-scale production of nanofibers in the future. This will be conducive to the further development of electrospinning, increase production, and more accurate control. [ABSTRACT FROM AUTHOR]

The electrical transport properties of SnO 2 (TiO 2 )/MAPbI 3 (MA = CH 3 NH 3 + ) heterojunction interfaces are investigated from ambient pressure to 20 GPa, and the transport properties are calculated by physical parameters such as trap energy density, binding energy, and charge transfer driving force and defect. Based on the partial density of states (PDOS) of the SnO 2 /MAPbI 3 heterojunction interface MAI-termination and PbI 2 -termination, greater charge transfer driving force and higher binding energy are observed, obviously showing the SnO 2 -based heterojunction is more stable. The SnO 2 /MAPbI 3 heterojunction interface possesses stronger electrical transport ability and is less prone to capture electrons compared with the TiO 2 /MAPbI 3 heterojunction interface. The differential charge density spectrum shows that the density is lower in the trap energy level of SnO 2 /MAPbI 3 , whilst the effect of the charge transfer defect is weaker owing to the trap energy level only existing in SnO 2 . The SnO 2 /MAPbI 3 heterostructure interface is less prone to capture electrons. The greater electron concentration difference is attributed to oxygen vacancy (Vo 0 ) in the SnO-like environment, resulting in superior electron transport ability compared with the TiO-like environment., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)