Investigation of 3D and 2D/3D heterojunction perovskite-based phototransistors

3D organic–inorganic hybrid perovskites have been widely used in applications associated with the photovoltaic effect owing to their favorable optoelectronic characteristics. However, the interaction of the perovskite in conventional perovskite-based electronic devices with moisture in air typically leads to a low environmental stability of these devices. Therefore, in this study, we fabricated mixed dimensional 2D/3D perovskite composite active layers to enhance the environmental stability of perovskite-based phototransistors without compromising their photoelectric properties. The photoresponsivity of the optimized 2D/3D perovskite-based phototransistor (5.27 × 10−2 A/W) was observed to be 2.08 times greater than that of the 3D perovskite-based phototransistor (2.61 × 10−2 A/W). Furthermore, the 2D/3D perovskite-based phototransistor retained 90.2% and 82.3% of its photocurrent generation and photoresponsivity, respectively, after being subjected to air with 40% humidity for 14 days. These results suggest that the 2D/3D perovskite films could effectively enhance the photoelectric performance and environmental stability of perovskite-based phototransistors.