三元氧化物CuCrO_(2)的结构、拉曼声子和变温光学特性  

Structure,Raman phonon and variable temperature optical properties of ternary oxide CuCrO_(2)

作　　者：梁璐 韩美杰 张继昊 李彬彬[1] 刘永慧[1] LIANG Lu;HAN Meijie;ZHANG Jihao;LI Binbin;LIU Yonghui(School of Electrical Engineering,Shanghai Dianji University,Shanghai 201306,China;School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)

机构地区：[1]上海电机学院电气学院,上海201306 [2]华东师范大学物理与电子科学学院,上海200241

出　　处：《东华大学学报（自然科学版）》2022年第4期55-60,共6页Journal of Donghua University(Natural Science)

基　　金：国家自然科学基金项目(61803253)。

摘　　要：为深入研究铜铁矿材料的结构、拉曼声子及内在光学响应机制,采用溶胶-凝胶法在AlO(001)衬底上制备具有铜铁矿结构的透明导电三元氧化物CuCrO_(2)薄膜。用X射线衍射仪、扫描电子显微镜和原子力显微镜对薄膜的微结构进行表征;用拉曼光谱和红外反射光谱研究CuCrO_(2)薄膜布里渊区中心的声子振动,给出声子的具体峰位以及声子振动的简化模型;测试CuCrO_(2)薄膜的变温透射光谱,并研究薄膜的光学禁带宽度随温度的变化。结果表明:CuCrO_(2)薄膜由较规则的柱状晶粒组成,薄膜内部晶粒聚集紧密,具有良好的结晶性和c轴择优取向性;变温透射光谱显示CuCrO_(2)薄膜可见光区的透光率为60%;10和300 K温度下,CuCrO_(2)薄膜的直接光学禁带宽度分别为3.12和3.09 eV;晶格热膨胀和电子-声子的相互作用导致CuCrO_(2)薄膜的光学禁带宽度随测试温度的升高而减小。To investigate the structure,Raman phonons and inherent optical response mechanism of delafossite material,a transparent conductive ternary oxide CuCrO_(2)film with delafossite structure was prepared on AlO(001)substrate using sol-gel method.The microstructure of the films was characterized by X-ray diffractometer,scanning electron microscopy and atomic force microscopy.The phonon vibrations in the center of the Brillouin zone of the CuCrO_(2)films were studied by Raman spectroscopy and infrared reflectance spectroscopy,and the specific peak positions of the phonons and a simplified model of the phonon vibrations were given.The variable temperature transmission spectra of the CuCrO_(2)films were tested and the variation of the optical band gap width with temperature was investigated.The results show that:the CuCrO_(2)films are composed of regular columnar grains with tightly packed grains and good crystallinity and c-axis selective orientation;the variable temperature transmission spectra show that the transmittance of the visible region of the CuCrO_(2)films is 60%;the direct optical band gap widths of the CuCrO_(2)films are 3.12 and 3.09 eV at 10 and 300 K,respectively;the lattice thermal expansion and electron-phonon interactions lead to a decrease in the optical band gap width of the CuCrO_(2)films with increasing test temperature.

关 键 词：CuCrO_(2) 拉曼声子 变温光学特性 光学禁带宽度 

分 类 号：O472[理学—半导体物理] O484[理学—物理]