Lead halide perovskites have attracted extensive attention in recent years because of their excellent photoelectronic properties, such as high absorption coefficients, carrier mobilities, defect tolerances, and photoluminescence efficiencies. However, a key issue hindering commercial application is the toxicity lead. Replacing lead with other nontoxic elements promising solution to this problem...

Abstract Designers from around the world have proposed numerous engineering design solutions for problems related to COVID-19 pandemic, many of which leverage rapid prototyping and manufacturing capabilities additive (AM). While some these are motivated by complex urgent requirements (e.g., face masks), others simpler less needs hands-free door openers). Previous research suggests that problem ...

There is now strong evidence that a consequence of human activities is the inadvertent accumulation of a variety of trace gases in the earth’s atmosphere. In the past decade, these global-scale changes in the chemical composition of the atmosphere have led to a very significant depletion of the stratospheric ozone layer over Antarctica in the southern spring months and also at northern latitude...