Influence of the Porosity of the TiO2 Film on the Performance of the Perovskite Solar Cell

Abstract EN

The structure of mesoporous TiO2 (mp-TiO2) films is crucial to the performance of mesoporous perovskite solar cells (PSCs).

In this study, we fabricated highly porous mp-TiO2 films by doping polystyrene (PS) spheres in TiO2 paste.

The composition of the perovskite films was effectively improved by modifying the mass fraction of the PS spheres in the TiO2 paste.

Due to the high porosity of the mp-TiO2 film, PbI2 and CH3NH3I could sufficiently infiltrate into the network of the mp-TiO2 film, which ensured a more complete transformation to CH3NH3PbI3.

The surface morphology of the mp-TiO2 film and the photoelectric performance of the perovskite solar cells were investigated.

The results showed that an increase in the porosity of the mp-TiO2 film resulted in an improvement in the performance of the PSCs.

The best device with the optimized mass fraction of 1.0 wt% PS in TiO2 paste exhibited an efficiency of 12.69%, which is 25% higher than the efficiency of the PSCs without PS spheres.