Fe掺杂GaN晶体非极性面的光学各向异性研究  

Optical Anisotropy of Non-Polar Surfaces of Fe-Doped GaN Crystal

作　　者：武圆梦 胡俊杰 王淼[1,2,3] 易觉民 张育民 王建峰 徐科[1,2,3,4] WU Yuanmeng;HU Junjie;WANG Miao;YI Juemin;ZHANG Yumin;WANG Jianfeng;XU Ke(School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China;Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China;Jiangsu Institute of Advanced Semiconductors Ltd., Suzhou 215000, China;Suzhou Nanowin Science and Technology Co., Ltd., Suzhou 215123, China)

机构地区：[1]中国科技大学纳米技术与纳米仿生学院,合肥230026 [2]中国科学院苏州纳米技术与纳米仿生研究所,苏州215123 [3]江苏第三代半导体研究院,苏州215000 [4]苏州纳维科技股份有限公司,苏州215123

出　　处：《人工晶体学报》2022年第6期996-1002,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(62174175)。

摘　　要：本文利用低温光致发光谱(PL)研究了Fe掺杂GaN晶体非极性a面{1120}、m面{1100}的带边峰和Fe^(3+)相关峰(^(4)T_(1)(G)-^(6)A_(1)(S))的偏振发光特性。结果表明:a面与m面光学各向异性差别较小,线偏振光的电矢量E平行于c轴[0001]时(E∥c),GaN带边峰强度最小,而Fe^(3+)零声子峰(1.299 eV)强度最强。带边峰线偏振度小,而Fe^(3+)零声子峰线偏振度大,a面带边峰的线偏振度为26%,Fe^(3+)零声子峰的偏振度在a面和m面分别达到55%和58%。在5 K低温下,进一步测量了Fe^(3+)精细峰和声子伴线的偏振特性,结果表明,除了一个微弱的峰外,其他精细峰和声子伴线与Fe^(3+)零声子峰偏振特性一致。本研究有助于拓展Fe掺杂GaN晶体材料在新型偏振光电器件领域的应用。In this paper,the polarization luminescence characteristics of the near-band-edge peak and Fe^(3+) related emission peaks(^(4)T_(1)(G)-^(6)A_(1)(S))of the non-polar surfaces including a-plane{1120}and m-plane{1100}of Fe-doped GaN crystal were studied by low-temperature photoluminescence(PL)measurement.The results show that the optical anisotropy of a-plane and m-plane are similar.When the linearly polarized electric-field vector E is parallel to the c-direction[0001](E∥c),the intensity of GaN near-band-edge peak is the lowest,and the intensity of Fe^(3+) zero-phonon line(1.299 eV)is the strongest.The degree of polarization of Fe^(3+) zero-phonon line is greater than that of near-band-edge peak.The degree of polarization of near-band-edge peak of a-plane is 26%,while the degree of polarization of Fe^(3+) zero-phonon line reaches up to 55%and 58%of a-plane and m-plane GaN,respectively.The polarization characteristics of Fe^(3+) fine peak and the additional lines are further measured at 5 K.The results show that,except for one weak peak,other peaks are consistent with the polarization characteristics of Fe^(3+) zero-phonon line.This study is helpful to expand the application of Fe-doped GaN crystal in the field of novel optical and electrical devices.

关 键 词：氮化镓 FE掺杂 半绝缘 非极性面 光学各向异性 光电特性 偏振光 

分 类 号：O734[理学—晶体学] TN304[电子电信—物理电子学]