Hollow TiO2 spheres as mesoporous layer for better efficiency and stability of perovskite solar cells

Hollow TiO2 spheres were synthesized by template method, with the diameters was 200 nm and the thickness of shell about 30 nm. The high-quality perovskite films fabricated on the hollow TiO2 mesoporous layer demonstrate smooth surface and large grain size, resulting in the better scattering light ability and fewer defects. The efficiency of the perovskite solar cells prepared on hollow mesoporous layer can reach 17.60%, which is an approximately 14% higher than the PCE of conventional mesoporous layer devices under the same condition. Importantly, the solar cells with hollow TiO2 can exhibit better stability than the cells with mesoporous TiO2 after aging 30 days in 65% relative humidity under dark conditions. The results indicate that the hollow TiO2 mesoporous layer will be a candidate for better efficient and stable CH3NH3PbI3 perovskite solar cells, and this structure provides a direction for the design of novel mesoporous layers for perovskite solar cells in future. (C) 2020 Published by Elsevier B.V.

Automated summary

Hollow TiO2 spheres were synthesized with diameters of 200 nm and shell thickness of about 30 nm by template method. The perovskite solar cells prepared on the hollow TiO2 mesoporous layer demonstrated higher efficiency and stability compared to conventional mesoporous layer devices, achieving an efficiency of 17.60%.