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Detection of collective optic excitations in molten NaI
S. Hosokawa, M. Inui, T. Bryk +6
High-resolution inelastic x-ray scattering measurements were carried out on molten NaI near the melting point at 680C at SPring-8. Small and damped indications of longitudi…
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…
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…
Photocarrier relaxation in two-dimensional semiconductors
Daichi Kozawa, Rajeev Kumar, Alexandra Carvalho +8
Two-dimensional (2D) crystals of semiconducting transition metal dichalcogenides (TMD) absorb a large fraction of incident photons in the visible frequencies despite being atomical…
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…
Fabrication of single-walled carbon nanotube/Si heterojunction solar cell with high photovoltaic conversion efficiency and stability
Feijiu Wang, Daichi Kozawa, Yuhei Miyauchi +4
The photovoltaic properties of carbon nanotube/Si heterojunction solar cells were investigated using network films of high quality single-walled carbon nanotubes (SWNTs) grown by a…
Tunable Photoluminescence of Monolayer MoS2 via Chemical Doping
Shinichiro Mouri, Yuhei Miyauchi, Kazunari Matsuda
We demonstrate the tunability of the photoluminescence (PL) properties of monolayer (1L)-MoS2 via chemical doping. The PL intensity of 1L-MoS2 was drastically enhanced by the adsor…
Femtosecond Excitation Correlation Spectroscopy of Single-Walled Carbon Nanotubes : Analysis Based on Nonradiative Multiexciton Recombination Processes
Yuhei Miyauchi, Kazunari Matsuda, Yoshihiko Kanemitsu
We studied the nonlinear time-resolved luminescence signals due to multiexciton recombination processes in single-walled carbon nanotubes (SWNTs) using femtosecond excitation corre…