Low-Temperature
Solution-Processed Tin Oxide as an
Alternative Electron Transporting Layer for Efficient Perovskite Solar
Cells
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Abstract
Lead
halide perovskite solar cells with the high efficiencies typically
use high-temperature processed TiO<sub>2</sub> as the electron transporting
layers (ETLs). Here, we demonstrate that low-temperature solution-processed
nanocrystalline SnO<sub>2</sub> can be an excellent alternative ETL
material for efficient perovskite solar cells. Our best-performing
planar cell using such a SnO<sub>2</sub> ETL has achieved an average
efficiency of 16.02%, obtained from efficiencies measured from both
reverse and forward voltage scans. The outstanding performance of
SnO<sub>2</sub> ETLs is attributed to the excellent properties of
nanocrystalline SnO<sub>2</sub> films, such as good antireflection,
suitable band edge positions, and high electron mobility. The simple
low-temperature process is compatible with the roll-to-roll manufacturing
of low-cost perovskite solar cells on flexible substrates