氮化镓低温高压光谱研究  

Low-temperature and high-pressure Spectroscopy study of Gallium Nitride

作　　者：范春梅 刘静仪 刘珊 唐琦琪 吴彬彬 王晓丽 雷力[1] FAN Chunmei;LIU Jingyi;LIU Shan;TANG Qiqi;WU Binbin;WANG Xiaoli;LEI Li(Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;Institute of Physics and Electronic Engineering, Linyi University, Linyi 276000, China)

机构地区：[1]四川大学原子与分子物理研究所,四川成都610065 [2]临沂大学物理与电子工程学院,山东临沂276005

出　　处：《光散射学报》2020年第3期259-265,共7页The Journal of Light Scattering

基　　金：国家自然科学基金(11774247、11974154、11674144);中央高校基本科研业务费专项资金资助;山东省自然科学基金(2019GGX103023、ZR2018MA038)。

摘　　要：本工作采用自主设计的低温高压装置,在77 K的低温条件下对纤锌矿型GaN进行了高压拉曼光谱、高压光致发光(PL)光谱以及第一性原理计算研究。拉曼光谱数据表明GaN的拉曼振动模在77 K下发生蓝移约5 cm^-1,但由温度引起的蓝移现象随压强的增加逐渐消失。PL光谱测量得到GaN在77 K常压下带隙为3.470 eV,并且随着压力增加带隙增大。采用第一性原理杂化泛函HSE方法,得到了同样的变化趋势。GaN的激子(ΓBX)特征峰能量随着压强的增加而增加,拟合得到77 K的条件下激子能量随压强变化关系为:E(P)=3.470+2.89×10-2P+1.1×10-3P2 eV。In this work,we have study the low-temperature(77 K)and high-pressure Raman,photoluminescence(PL)spectroscopy and Heyd-Scuseria-Ernzerh(HSE)of hybrid functional theory calculation of wurtzite-type GaN based on our self-designed low-temperature and high-pressure experimental apparatus.The Raman spectroscopy indicates that the Raman vibration modes of GaN exhibit a blue shift at 77 K,but the blue shift gradually disappears at higher pressures.The PL spectroscopy shows that the zero-pressure band gap of GaN is 3.470 eV at the 77 K and it increases with increasing pressure.In addition,band gap values of GaN under high pressure have also been calculated by HSE hybrid functional theory.The pressure dependence of the calculated result is consistent with the experimental measurement.The energy of the exciton(ΓBX)increases with increasing pressure,and the relationship between the exciton energy(77 K)and pressure can be fitted to E(P)=3.470+2.89×10-2P+1.1×10-3P2 eV.

关 键 词：氮化镓 低温高压 光致发光谱 拉曼散射 第一性原理 

分 类 号：O51343[理学—低温物理] O5213[理学—物理]