1 research outputs found
Air-Stable Molecular Semiconducting Iodosalts for Solar Cell Applications: Cs<sub>2</sub>SnI<sub>6</sub> as a Hole Conductor
We
introduce a new class of molecular iodosalt compounds for application
in next-generation solar cells. Unlike tin-based perovskite compounds
CsSnI<sub>3</sub> and CH<sub>3</sub>NH<sub>3</sub>SnI<sub>3</sub>,
which have Sn in the 2+ oxidation state and must be handled in an
inert atmosphere when fabricating solar cells, the Sn in the molecular
iodosalt compounds is in the 4+ oxidation state, making them stable
in air and moisture. As an example, we demonstrate that, using Cs<sub>2</sub>SnI<sub>6</sub> as a hole transporter, we can successfully
fabricate in air a solid-state dye-sensitized solar cell (DSSC) with
a mesoporous TiO<sub>2</sub> film. Doping Cs<sub>2</sub>SnI<sub>6</sub> with additives helps to reduce the internal device resistance, improving
cell efficiency. In this way, a Z907 DSSC delivers 4.7% of energy
conversion efficiency. By using a more efficient mixture of porphyrin
dyes, an efficiency near 8% with photon confinement has been achieved.
This represents a significant step toward the realization of low-cost,
stable, lead-free, and environmentally benign next-generation solid-state
solar cells