Layered mixed-anion compounds: Epitaxial growth, active function exploration, and device application

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• 作者：Hidenori Hiramatsu ; Yoichi Kamihara ; Hiroshi Yanagi ; Kazushige Ueda ; Toshio Kamiya ; Masahiro Hirano ; Hideo Hosono
• 关键词：Epitaxial thin films ; Solid state reaction ; Electrical properties ; Optical properties ; Superconductivity
• 刊名：Journal of the European Ceramic Society
• 出版年：2009
• 出版时间：January 2009
• 年：2009
• 卷：29
• 期：2
• 页码：245-253
• 全文大小：1539 K

文摘

Optoelectronic properties and device applications of layered mixed-anion compounds such as oxychalcogenide LaCuOCh (Ch = chalcogen) and oxypnictide LaT_MOPn (T_M = 3d transition metal, Pn = pnicogen) are reviewed. Several distinctive functions have been found in these materials based on our original material exploration concept. Fabrication of high-quality epitaxial films of LaCuOCh leads to clarifying the excellent electrical and optical properties such as high hole mobility of 8 cm²/(V s) and heavy hole doping at >10²¹ cm⁻³ in LaCuOSe, and sharp and tunable-wavelength photoluminescence in the solid–solution systems in LaCuOCh. In addition, a room temperature operation of a light-emitting diode is demonstrated using LaCuOSe as a light-emitting layer. These results suggest that the layered oxychalcogenides have potential for light-emitting layers as well as transparent hole-injection layers in organic/inorganic light-emitting diodes. Furthermore, by extending the material system from the copper-based oxychalcogenides to isostructural compounds, transition metal-based oxypnictides LaT_MOP (T_M = Fe, Ni), we have found novel superconductors, LaFeOP and LaNiOP.