114學年材料所-第四週 專題研討課程 演講公告 (114年9月25日)
2025.09.23
題目:
晶格的細微變化造成半導體晶體的性質有晶面效應
Properties of Semiconductor Crystals Are Facet-Dependent from Lattice Deviations
演講者 :黃暄益(Huang, Michael Hsuan-Yi)
現職 : 國立清華大學 化學系 講座教授
時間: 114年 9月 25日(四) 3:20~4:00 pm
地點: 鋼構區(3F)共同教室A1302演講廳
演講摘要:
Semiconductor crystals exposing different surfaces show facet-dependent electrical conductivity, photocatalytic activity, light absorption, piezoelectricity, and magnetism behaviors. Just like grilling a piece of meat, all these phenomena arise from greater facet-specific lattice deviations in the surface layer region, while the crystal bulk also exhibit slight cell constant changes with different particle shapes. Synchrotron XRD patterns and FFT processing of HR-TEM images reveal the structural variations. In addition to the facet effect, optical properties of semiconductor crystals also display size dependence. Optical size effect has been found to also relate to tiny cell constant changes.
晶格的細微變化造成半導體晶體的性質有晶面效應
Properties of Semiconductor Crystals Are Facet-Dependent from Lattice Deviations
演講者 :黃暄益(Huang, Michael Hsuan-Yi)
現職 : 國立清華大學 化學系 講座教授
時間: 114年 9月 25日(四) 3:20~4:00 pm
地點: 鋼構區(3F)共同教室A1302演講廳
演講摘要:
Semiconductor crystals exposing different surfaces show facet-dependent electrical conductivity, photocatalytic activity, light absorption, piezoelectricity, and magnetism behaviors. Just like grilling a piece of meat, all these phenomena arise from greater facet-specific lattice deviations in the surface layer region, while the crystal bulk also exhibit slight cell constant changes with different particle shapes. Synchrotron XRD patterns and FFT processing of HR-TEM images reveal the structural variations. In addition to the facet effect, optical properties of semiconductor crystals also display size dependence. Optical size effect has been found to also relate to tiny cell constant changes.