Masatomo Sumiya

軟X線放射光光電子分光によるArスパッタしたm面GaNの化学状態分析とショットキー電極形成

Masatomo Sumiya

jp (code pays fourni par la source)

Effect of strain-induced defects in GaN channel on two-dimensional carrier transport in AlGaN/GaN heterostructures

Masatomo Sumiya, Y. Imanaka, Yoshitaka Nakano

To improve the mobility of two-dimensional electron gas (2DEG) in an AlGaN/GaN heterostructure grown by metalorganic chemical vapor deposition, we characterized the defect distribution around the interface with and without an AlN interlayer by the steady-state photocapacitance method under controlling the bias …

jp, us (code pays fourni par la source)

Raman Imaging Properties and Phonon Dynamics Analysis of GaInN/GaN Heterostructures using a Double Laser System

Yoshihiro Ishitani, Thee Ei Khaing Shwe, Tatsuya Asaji, Yusuke Ishii et autres

Heat energy transport is reportedly significantly blocked at the heterointerfaces in semiconductors. However, imaging the transport across heterointerfaces remains challenging. This article presents the advantages of an imaging system using two lasers for heating and probing. Samples with heterostructures of Ga 1− …

jp, sa (code pays fourni par la source)

Thermal conductivity of suspended GaN thin film measured by Raman spectroscopy

Sopheap Sam, Yutao Fang, Ziling Cai, Masatomo Sumiya et autres

jp, cn (code pays fourni par la source)

Evaluation of defect density in bulk gallium nitrides by photothermal deflection spectroscopy and steady-state photocapacitance methods

Masatomo Sumiya, Hajime Fujikura, Yoshitaka Nakano, Shuhei Yashiro et autres

jp (code pays fourni par la source)

Fabrication of AlGaN/GaN heterostructures on halide vapor phase epitaxy AlN/SiC templates for high electron mobility transistor application

Masatomo Sumiya, Osamu Goto, Yuki Takahara, Y. Imanaka et autres

Abstract GaN films were grown on hydride vapor phase epitaxy (HVPE) AlN/SiC templates by metalorganic CVD (MOCVD) without annealing the reactor to eliminate the memory effect. A step-terrace structure and smooth surface were obtained for the GaN film, which had a thickness …

jp (code pays fourni par la source)

Characterization of wide-gap semiconductors by photothermal deflection spectroscopy

Masatomo Sumiya

Abstract Group III–V nitride semiconductors have been characterized by photothermal deflection spectroscopy (PDS) which can provide information on nonradiative recombination involving defect levels. After understanding the challenges of applying PDS to materials emitting light, the advantages and features of PDS are described …

jp (code pays fourni par la source)

Vacancy-type defects in AlInN/AlN/GaN structures probed by monoenergetic positron beam

Akira Uedono, Yasuki Kimura, Takuya Hoshii, Kuniyuki Kakushima et autres

Vacancy-type defects in AlInN(10 nm)/AlN(1–2 nm)/GaN were probed by using a positron annihilation technique. The crystal quality of the AlInN layer and atomic diffusion near heterointerfaces were also studied by x-ray diffraction reciprocal space mapping, transmission electron microscopy, and energy-dispersive x-ray spectroscopy. …

jp (code pays fourni par la source)

KEY TECHNOLOGIES ON RENEWABLE MATERIALS AND ENERGY RESOURCES FOR PEACE AND SURVIVAL DIPLOMACY OF MANKIND ON THE EARTH

Hideomi Koinuma, Kenji Itaka, Masatomo Sumiya, Sataro Yamaguchi

Depending primarily on the energy resource and technology, the human civilization is classified into several generations: G1 (Hunting), G2 (Agricultural), G3 (Coal/Industrial: 18-19C), G4 (Electric/Electronic: 20C-), and G5~ (Quantum/Metaverse: IoT/AI, 21C). Recent progress in science and technology is so fast that it …

jp (code pays fourni par la source)

CCDC 2069196: Experimental Crystal Structure Determination

Tsubasa Mikie, Masahiro Hayakawa, Kenta Okamoto, Keitaro Iguchi et autres

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

CCDC 2069197: Experimental Crystal Structure Determination

Tsubasa Mikie, Masahiro Hayakawa, Kenta Okamoto, Keitaro Iguchi et autres

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …

CCDC 2069195: Experimental Crystal Structure Determination

Tsubasa Mikie, Masahiro Hayakawa, Kenta Okamoto, Keitaro Iguchi et autres

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, …