Toward Perfect Surfaces of Transition Metal Dichalcogenides with Ion Bombardment and Annealing Treatment

Abstract

Layered transition metal dichalcogenides (TMDs) are two-dimensional materials exhibiting a variety of unique features with great potential for electronic and optoelectronic applications. The performance of devices fabricated with mono or few-layer TMD materials, nevertheless, is significantly affected by surface defects in the TMD materials. Recent efforts have been focused on delicate control of growth conditions to reduce the defect density, whereas the preparation of a defect-free surface remains challenging. Here, we show a counterintuitive approach to decrease surface defects on layered TMDs: a two-step process including Ar ion bombardment and subsequent annealing. With this approach, the defects, mainly Te vacancies, on the as-cleaved PtTe 2 and PdTe 2 surfaces were decreased by more than 99%, giving a defect density <1.0 × 10 10 cm −2 , which cannot be achieved solely with annealing. We also attempt to propose a mechanism behind the processes.

Fast‐Curing of Liquid Crystal Thermosets Enabled by End‐Groups Regulation and In Situ Monitoring by Triboelectric Spectroscopy

“…These results might be closely related to the micro-branched crosslinked structure derived from the transesterification during the isothermal stage (Figure 6A). [31] However, the V oc of MA-LC-MA cured for 45 min showed anomalous increase, which can be attributed to the enhancement of 𝜖′. due to the interfacial polarization.…”