Professor Kazuhiro Group recently received the Japan Society of Applied Physics (JSAP) Outstanding Paper Award 2022. According to the JSAP, the award is presented to “the authors of outstanding papers published in the membership journal, Oyo Buturi, Japanese Journal of Applied Physics, and Applied Physics Express. These awards honor the authors of papers that are regarded as exceptional achievements in applied physics.”
We have grown high-crystallinity InGaN layers on ScAlMgO4 (SAM) substrates using metalorganic vapor-phase epitaxy. We have prepared atomically flat SAM substrates by cleaving them along the c-plane and have utilized direct InGaN growth without any low-temperature buffer layer. The resulting InGaN layer has a distinct hexagonal hillock morphology and remarkable crystalline quality.
We have developed a new LED structure by using hydrogen passivation. The result is accepted in Crystals to the Special Issue "In Celebration of the 30th Anniversary of Shuji Nakamura’s Contribution to Blue Light-emitting Diodes”. The new device showed higher EQE and WPE compared to the conventional LED structures.
We studied the electrochemical property of nitride semiconductors. It was expected to be the three-electron nature so far. However, we have found out that it is the six-electron nature. The six-electron nature was observed in different solutions and pH levels, resulting in a universal phenomenon for nitride semiconductors. The result will be useful to control electrochemical etching and other treatments to achieve their precise control.
Prof. Ohkawa has accepted the nomination of the Editorial Board Member of the Scientific Reports, Nature Publishing Group. Scientific Reports is an open-access journal publishing rigorously peer-reviewed research from across the natural sciences, psychology, medicine, and engineering. This journal is one of the highly ranked ones, has a 2-year impact factor: 4.996 (2021), and is the 5th most-cited journal in the world.
Dr. Iida has accepted the nomination of the Editorial Board Member of the Scientific Reports, Nature Publishing Group. Scientific Reports is an open-access journal publishing rigorously peer-reviewed research from across the natural sciences, psychology, medicine, and engineering. This journal is one of the highly ranked ones, has a 2-year impact factor: 4.996 (2021), and is the 5th most-cited journal in the world.