Defects in metal oxides: spectroscopy of their functions in energy science

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420884
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Energy engineering
• Research Institution: Kyoto University
• Principal Investigator: Hachiya Kan 京都大学, エネルギー科学研究科, 准教授 (90314252)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: エネルギー生成・変換

Outline of Final Research Achievements

Mid-infrared free-electron laser was used to investigate phonon properties in metal oxide single crystals, wurtzite ZnO and perovskite SrTiO3, with an emphasis on their electron-lattice interactions. Carriers in metal oxides are created for charge compensation during defects formation. Functions of energy conversion devices emerge, affected by carrier transportation under strong interactions with lattice vibrations. A1(LO) mode in GaN, which also has wurtzite structure, was successfully excited selectively, while ZnO, which is non-stoichiometric oxide and has defects, failed because of photoluminescence from defects. Spectroscopy of the defects with UVSOR was also performed.

Free Research Field

固体材料物性