High-performance planar photoconductors based on hybrid perovskite CH3NH3 PbI3 and 2D material WS2 were fabricated and characterized for the first time. Due to the superior properties of both perovskite and WS2, these photodetectors with a simple bilayer structure exhibited high on/off ratios and high responsivity. Owing to the high mobility of the WS2 monolayer and the efficient inter facial charges separation, the response speed of the hybrid WS2/perovskite photoconductor was enhanced by four orders of magnitude compared to the reference perovskite single layer. Furthermore, the WS2 monolayer served as an atomically flat substrate, and the perovskite films grown on top showed better crystallinity, which may facilitate the synthesis of other perovskite-based devices. Overall, our results demonstrated a prototypical optoelectronic device built on TMD/perovskite hetero structures, paving their way for future applications.
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the King Abdullah University of Science and Technology (KAUST).