Defective TiO2 with high photoconductive gain for efficient and stable planar heterojunction perovskite solar cells
Li, Y. et al. Defective TiO2 with high photoconductive gain for efficient and stable planar heterojunction perovskite solar cells. Nature Communications, 7, 12446, DOI: 10.1038/ncomms12446 (2016).
Defects in TiO2 electron selective contacts to halide perovskite light absorbers are engineered to beneficially reduce photocatalytic degradation and enable a high photoconductive gain.
Long-term stability and high efficiency from planar heterojunction halide perovskites is enabled by addressing interfacial degradation and charge transfer resistance limitations.
- Hole-trapping states introduced to TiO2 via low temperature deposition in an oxygen-deficient atmosphere
- Hole trapping reduces interfacial photocatalytic oxidation of perovskite and allows high photoconductive gain that improves electron extraction efficiency