Control Properties of TiO_2 Electron Transport Layer for High Efficiency Perovskite Solar Cells

摘要

We investigate the influence of electron collection and transportation of TiO_2 electrode (ETL) on conventional n-i-p type mesoscopic perovskite solar cells, especially focus on the effect of compact TiO2 layer (cl-TiO_2), thickness of mesoporous TiO2 (meso-TiO_2) layer, TiO_2 nanoparticle (NP) size in meso-TiO+2 layer and post-treatment on perovskite solar cells. The cl-TiO_2 layer is controlled by spray pyrolysis deposition method. The various size of TiO_2 NPs with high purity anatase phase are synthesized and further to optimal the meso-TiO_2 thickness to improve the electron collection and transport efficiency, and to reduce the J-V hysteresis behavior of perovskite solar cells. After improving the fabrication process of TiO_2 ETL, the best performance of PSC shows the power conversion efficiency of 19.39% (reverse scan) and 19.12% (forward scan), respectively, under 100 mW/cm~2 (AM 1.5G) and shows the excellent CPE of 25.49% under the illumination of 6000 lx of T5 light source.