1 research outputs found
Unravelling the Effects of Cl Addition in Single Step CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Perovskite Solar Cells
The
effect of film morphology on the photovoltaic performances
is illustrated. Pin holes free and uniform films could be formed by
slowing down the crystallization rate through additional of excess
CH<sub>3</sub>NH<sub>3</sub><sup>+</sup>. Though better film coverage
is obtained, the device series resistance increases as excess CH<sub>3</sub>NH<sub>3</sub>I increases. Thermogravimetric analysis confirms
the presence of residual excess CH<sub>3</sub>NH<sub>3</sub>I in the
final film. When chlorine is added to the CH<sub>3</sub>NH<sub>3</sub><sup>+</sup> rich system, CH<sub>3</sub>NH<sub>3</sub>Cl is formed
and can easily sublime during annealing at 100 °C. A little trace
of excess CH<sub>3</sub>NH<sub>3</sub>Cl can be detected from thermogravic
analysis, and the residual chlorine atoms match with XPS reading