Abstract
The instant extraction and transmission of photogenerated charge carriers is the key factor to obtain efficient perovskite solar cells (PSCs). The mesoporous electronic transport layer can provide heterogeneous nucleation sites for high‐quality perovskite films and expand the charge separation region to better balance charge transport. Therefore, compared with planar PSCs, most mesoporous PSCs usually exhibit superior photovoltaic performance. Herein, TiO2 microspheres with high crystallinity and purity are synthesized by a single source, surfactant‐free, and one‐step solvothermal reaction strategy. The morphology character of TiO2 mesoporous layers is conducive to good permeation and interfacial contact of perovskite. The gradient adjustment of energy level by the insertion of TiO2 mesoporous layer in the device is beneficial for the effective extraction of electrons. Finally, the optimized mesoporous PSCs can achieve an efficiency of 20.95% with slight hysteresis and satisfactory reproducibility.
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