Picosecond electrical response in graphene/MoTe₂ heterojunction with high responsivity in the near infrared region.

ABSTRACT: Understanding the fundamental charge carrier dynamics is of great significance for photodetectors with both high speed and high responsivity. Devices based on two-dimensional (2D) transition metal dichalcogenides can exhibit picosecond photoresponse speed. However, 2D materials naturally have low absorption, and when increasing thickness to gain higher responsivity, the response time usually slows to nanoseconds, limiting their photodetection performance. Here, by taking time-resolved photocurrent measurements, we demonstrated that graphene/MoTe₂ van der Waals heterojunctions realize a fast 10 ps photoresponse time owing to the reduced average photocurrent drift time in the heterojunction, which is fundamentally distinct from traditional Dirac semimetal photodetectors such as gr

SUBMITTER: Zeng Z 

PROVIDER: S-EPMC11197620 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature