3D‐Structured Photodetectors Based on 2D Transition‐Metal Dichalcogenide

3D‐structured transition‐metal dichalcogenides (TMDCs) are attracting significant attention in the field of photodetection owing to their remarkable and superior electronic and optoelectronic properties. This review outlines the optical properties of graphene and TMDCs. The recent progress in 2D‐planar graphene and TMDC‐based photodetectors are discussed. In addition, the recent advances in the different types of 3D‐structured TMDCs and their heterostructures used in photodetectors are elaborated in detail. These 3D‐structured TMDC‐based photodetectors exhibit enhanced optoelectronic properties compared to 2D‐planar photodetectors. Finally, this review concludes with the latest developments in 3D‐structured graphene and TMDC‐based photodetectors, and discusses the present challenges and future prospects for high‐performance photodetectors.