High-Performance Photodetection of In-Situ Core/Shell Perovskite-MoS₂ Phototransistors

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) are promising materials that can be used in various fields of optoelectronic devices due to their atomically thin nature, tunable band gap, high on/off ratio, and excellent electrical properties [1]. From a material perspective, the photodetectors based on 2D TMDCs can potentially create flexible devices with high integration density. However, their atomic-level thinness results in low light absorption, which hinders sensitive photodetection. In this presentation, we address the shortcoming of low light absorption by depositing in-situ core/shell perovskite onto the MoS₂ channel, significantly improving charge transfer and light absorption efficiency [2]. The perovskite/MoS₂ hybrid device exhibited enhanced responsivity and specific detectivity compared to the pristine device thanks to the strong photogating effect [3]. Our research improves the performance of the 2D MoS₂ photodetector through a simple process, which provides a promising approach for high-performance photodetectors based on 2D materials.

[1] Q. H. Wang et al., Nat. Nanotech. 7, 699 (2012).

[2] J. S. Kim et al., Nature, 611, 688 (2022).

[3] J. Sim et al., ACS Nano, 18, 16905 (2024).