Dielectric spectroscopy methods revealed the existence of two types relaxation processes in semiconductor phase VO 2 : Fe films. The characteristic times are denoted by tau 1 and . It is shown that temperature dependences have hysteresis, position loops which coincides with points semiconductor-metal transition. corresponds to undoped, Fe-doped nanocrystallites film. physical mechanism process ...

A comprehensive picture explaining the effect of crystal size in metal halide perovskite films on their opto-electronic characteristics is currently lacking. We report that nanocrystallites exhibit a wider band gap due to concurrent quantum confinement and dependent structural effects, with latter being remarkably distinct attributed perturbation from surface affecting structure core. This phen...

As a relatively new class of photovoltaic devices with a photoelectrochemical system consisting of a dye-sensitized semiconductor film and an electrolyte, dye-sensitized solar cells (DSSCs) have been regarded as a promising alternative to conventional solid-state semiconductor solar cells. They are relatively cost-effective, are easy to manufacture, and can be readily shaped with flexible subst...