Nanoscale enhancement of photoconductivity by localized charge traps in the grain structures of monolayer MoS₂.

ABSTRACT: We report a method for mapping the nanoscale anomalous enhancement of photoconductivity by localized charge traps in the grain structures of a molybdenum disulfide (MoS₂) monolayer. In this work, a monolayer MoS₂ film was laterally scanned by a nanoscale conducting probe that was used to make direct contact with the MoS₂ surface. Electrical currents and noise maps were measured through the probe. By analyzing the data, we obtained maps for the sheet resistance and charge trap density for the MoS₂ grain structures. The maps clearly show grains for which sheet resistance and charge trap density were lower than those of the grain boundaries. Interestingly, we found an unusual inverse proportionality between the sheet resistance and charge trap densi

SUBMITTER: Yang M 

PROVIDER: S-EPMC6202400 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature