Performance enhancement of perovskite solar cell on AZO substrate via atomic layer deposited TiO2 layer

In this study, TiO ₂ thin film is prepared between the aluminum-doped zinc oxide (AZO) substrate and SnO ₂ electron transfer layer by low temperature atomic layer deposition (ALD). Perovskite solar cell (PSC)is fabricated with the device of AZO/TiO ₂ /SnO ₂ /FA _0.7 MA _0.2 PbCs _0.1 Br _0.67 I _2.33 /Sprio-OMeTAD/Au. Results show that, with the introduction of TiO ₂ thin film, the stacked electron transfer layer (TiO ₂ /SnO ₂ ) exhibits more better transmittance of light and charges extraction ability that lead to increase of the short circuit current density (J _sc ).