The effect of external electric field on the performance of perovskite solar cells

• Planar heterojunction perovskite solar cells were successfully fabricated through a low-temperature solution process.
• The performance of perovskite solar cells was found to strongly depend on the external bias treatment.
• Ions motion under the external bias was considered to be the potential reason for the dependence of external bias.

Planar heterojunction perovskite solar cells were fabricated through a low temperature approach. We find that the device performance significantly depends on the external bias before and during measurements. By appropriate optimization of the bias conditions, we could achieve an 8-fold increase in the power conversion efficiency. The significant improvement in device performance might be caused by the ion motion in the perovskite under the external electric field.

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