Exciton-to-Trion Conversion in Monolayer WS₂ under Pressure.

ABSTRACT: Exciton-to-trion conversion in two-dimensional semiconductors defines the transition from an optoelectronics based on neutral bosons to one based on charged fermions, with a huge impact on the transport and spin/valley-related properties. This process has been successfully induced in field-effect transistors under gate voltage, chemically doped samples, and nonuniformly nanoscale-strained materials. Here, we study the evolution of the photoluminescence spectrum of monolayer WS₂ under high pressure, decoupling exciton and trion contributions by their responses to laser-power variations. We demonstrate that crystal compression drives a substrate-independent, partially reversible exciton-to-trion conversion, with trion recombination dominating the emission above 3 GPa. The observed

SUBMITTER: D'Alo B 

PROVIDER: S-EPMC12426993 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature