Electrostatically enhanced infrared absorption in two-dimensional van der Waals structures.

ABSTRACT: Two-dimensional (2D) semiconductors exhibit strong light absorption, yet their large bandgaps limit broadband photodetection. While van der Waals (vdW) heterostructures of 2D materials enable infrared excitation through narrowed interlayer bandgaps, achieving efficient control over these interlayer transitions remains a fundamental challenge. Through first-principles simulations and electrostatic engineering approaches, this study establishes a direct correlation between interfacial charge redistribution and enhanced interlayer excitations in 2D vdW structures. The results demonstrate that versatile strategies such as external electric field application, substitutional doping, and graphene interlayer integration effectively reduce interlayer bandgaps by several hundred millielectronvolts w

SUBMITTER: Ma Z 

PROVIDER: S-EPMC12466197 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature