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9 papers
Anisotropic Optical Properties of Layered Germanium Sulfide
Dezhi Tan, Hong En Lim, Feijiu Wang +7
Two-dimensional (2D) layered materials, transition metal dichalcogenides and black phosphorus, have attracted much interest from the viewpoints of fundamental physics and device ap…
Evidence for Fast Interlayer Energy Transfer in MoSe2/WS2 Heterostructures
Daichi Kozawa, Alexandra Carvalho, Ivan Verzhbitskiy +6
Strongly bound excitons confined in two-dimensional (2D) semiconductors are dipoles with a perfect in-plane orientation. In a vertical stack of semiconducting 2D crystals, such in-…
Enhanced Photovoltaic Performances of Graphene/Si Solar Cells by Insertion of an MoS2 Thin Film
Yuka Tsuboi, Feijiu Wang, Daichi Kozawa +5
Atomically thin layered materials such as graphene and transition-metal dichalcogenides exhibit great potential as active materials in optoelectronic devices because of their high…
Nonlinear Photoluminescence in Atomically Thin Layered WSe2 Arising from Diffusion-Assisted Exciton-Exciton Annihilation
Shinichiro Mouri, Yuhei Miyauchi, Minglin Toh +3
We studied multi-exciton dynamics in monolayer WSe2 using nonlinear photoluminescence (PL) spectroscopy and Monte Carlo simulations. We observed strong nonlinear saturation behavio…
Nonlinear Photoluminescence Properties of Trions in Hole-doped Single-walled Carbon Nanotubes
Naoto Akizuki, Munechiyo Iwamura, Shinichiro Mouri +7
We studied the excitation density dependence of photoluminescence (PL) spectra of excitons and trions (charged excitons) in hole-doped single-walled carbon nanotubes. We found that…
Size-Dependent Luminescence Properties of Chromatographically-Separated Graphene Quantum Dots
Naoto Fuyuno, Daichi Kozawa, Yuhei Miyauchi +6
We studied the photoluminescence (PL) properties of graphene quantum dots (GQDs) separated by size-exclusion high performance liquid chromatography. The size separation of GQDs was…