Two-Dimensional Phototransistors with van der Waals Superstructure Contacts for High-Performance Photosensing.

ABSTRACT: Semiconducting transition metal dichalcogenides (TMDs) possess exceptional photoelectronic properties, rendering them excellent channel materials for phototransistors and holding great promise for future optoelectronics. However, the attainment of high-performance photodetection has been impeded by challenges pertaining to electrical contact. To surmount this obstacle, we introduce a phototransistor architecture, in which the WS₂ channel is connected with an alternating WS₂-WSe₂ strip superstructure, strategically positioned alongside the source and drain contact regions. Illumination triggers efficient separation of photoexcited electrons and holes due to the type-II staggered band alignment within the superstructure. Consequently, the contact regions exhi

SUBMITTER: Siao MD 

PROVIDER: S-EPMC11788984 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature