Jeong Seuk Kang

TL;DR: Artificial semiconductor heterostructures built from single-layer WSe2 and MoS2 observe a large Stokes-like shift of ∼100 meV between the photoluminescence peak and the lowest absorption peak that is consistent with a type II band alignment having spatially direct absorption but spatially indirect emission.

TL;DR: This work investigates effects of anion vacancies in monolayer transition metal dichalcogenides as two-dimensional (2D) semiconductors where the vacancies density is controlled by α-particle irradiation or thermal-annealing and finds a new, sub-bandgap emission peak as well as increase in overall photoluminescence intensity as a result of the vacancy generation.

TL;DR: Physi-sorbed O2 and/or H2O molecules electronically deplete n-type materials such as MoS2 and MoSe2, which weakens electrostatic screening that would otherwise destabilize excitons, leading to the drastic enhancement in photoluminescence.

TL;DR: In this work, all interfaces are based on van der Waals bonding, presenting a unique device architecture where crystalline, layered materials with atomically uniform thicknesses are stacked on demand, without the lattice parameter constraints, demonstrating the promise of using an all-layered material system for future electronic applications.

TL;DR: Benzyl viologen (BV), which has one of the highest reduction potentials of all electron-donor organic compounds, is demonstrated as a surface charge transfer donor for MoS2 flakes, exhibiting excellent stability in both ambient air and vacuum.