Resonances in ferroelectric phononic superlattice

Abstract

The periodically poled ferroelectric wafer is a two-dimensional phononic superlattice. The important applications of such a solid include ultrasonic transducers at the micro/nano-scale for low intensity ultra-sonography, ferroelectric data storage, and development of very high frequency chips for next generation communication and information technologies, and others. In this work, we show theoretically and experimentally that a ferroelectric phononic superlattice has two distinctive resonances in acousto-electric transformation. They are associated with a split acoustic mode at the boundary between the first and second acoustic Brillouin zone.

In Effect of Reducing Agents in the Preparation and Light Harvesting Properties of CuinS2 Nanoparticles

“…These results indicate a decrease in the FF and corresponding values showing that the constructed solar cells have lower efficiency as opposed to those prepared using bulk particles. Similar results have been reported earlier quoting defect formation and increase in band gap of CuInS2nanoparticles which could have resulted in decreased light harvesting applications [23]. As opposed to popular belief, the reduction in particle size does not result in increased light absorption and greater solar cell efficiency.…”

“…According to Figure 2a, the morphology of the sample was spherical, composed of a large number ofnanoparticles with a mean size of approximately80 nm. It is interesting to note that theeffectof these particular Sulphur sources have been recordedearlier by Hosseinpour-Mashkani et al [23]. The conclusion from the article shows that the slower nucleation of various Sulphur sources results in the formation of nanoparticles in different sizes.…”

“…The solar cell using CuInS2 nanoparticles as the absorber layer was constructed in a similar fashion to earlier mentioned reports [23]. Briefly, slurries of CuInS2 nanoparticles (0.05 gof nanoparticles, 0.05 g ofethyl cellulose and 0.05 mL of Triton X-100 in 5 mL of ethanol) were used to form p-type semiconducting layers via Doctor's blade method on Indium Tin oxide (ITO) substrate.…”