Search

We investigated the impact of annealing atmosphere on the properties of organic-inorganic perovskite films systematically, and the mechanism is elucidated in perspective of crystallization kinetics of perovskite. It is found that the kind of gas, the state of the gas and the existence of solvent during annealing can affect the crystallization process of perovskite films, which therefore influence the morphology of perovskite films. In addition, the perovskite-based thin-film field-effect transistors were fabricated in different heating environment. It was discovered that the effect of annealing atmosphere on the performance of transistors is consistent with that on the crystallization qualities of perovskite films, which further confirms the influence of annealing atmosphere on the electronic properties of perovskite films. We also found that the type of gas has impact on the electronic properties of perovskite thin films probably by influencing the defects in the surface of perovskite films. Furthermore, it is notable that we confirmed that perovskite based transistors, of which the active layer was completely fabricated in air, show better performance, which is beneficial for commercial production of perovskite based transistors with low cost. [ABSTRACT FROM AUTHOR]

A facile and low‐temperature solution processed UV/ozone process has been proposed for fabricating TiO2 layer, making it possible to fabricate planar perovskite solar cells at low temperature. UV/ozone photo‐annealing treatment could easily eliminate the organic components, resulting in high quality amorphous TiO2 films with high transparency, electrical conductivity, and hydrophilicity. In addition, perovskite solar cells with the UV/ozone‐treated TiO2 electron transport layer exhibiting the best power conversion efficiency of 11.58% for rigid substrate and 7.33% for flexible substrate, respectively. The results clearly indicate that UV/ozone photo‐annealing treatment is a simple and effective process of fabricating high performance flexible perovskite solar cells. Fully low‐temperature solution‐processed perovskite solar cells (PSCs) are fabricated using UV/ozone (UV/O3) treated TiO2 film as an electron transport layer. UV/O3 treatment increases the electrical conductivity and wettability of the TiO2 film, and therefore improves the performance of PSCs. By optimizing the processing time of UV/O3 treatment, the power conversion efficiency of the best rigid and flexible device is 11.58% and 7.33%, respectively. [ABSTRACT FROM AUTHOR]