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简并态锗在大注入下的自发辐射谱模拟
  • ISSN号:1000-3290
  • 期刊名称:《物理学报》
  • 时间:0
  • 分类:O413.1[理学—理论物理;理学—物理]
  • 作者机构:厦门大学物理学系,协同创新中心,半导体光子学研究中心,厦门361005
  • 相关基金:国家重点基础研究计划(批准号:2013CB632103); 国家自然科学基金(批准号:61474094)资助的课题
中文摘要:

基于费米狄拉克模型模拟了应变、温度以及掺杂对简并态锗的直接带自发辐射谱的影响.随着温度升高,更多的电子被激发到导带中,使得锗自发辐射谱的峰值强度和积分强度随温度的升高而增大.对自发辐射谱峰值强度的m因子进行计算,结果表明张应变可以显著提高锗自发辐射的温度稳定性.在相同应变水平下,由Γ-hh跃迁引起的自发辐射谱峰值强度大于Γ-lh跃迁引起的自发辐射谱峰值强度,但二者的积分强度几乎相等.此外,计算结果还证明了n型掺杂能显著提高锗的自发辐射强度.以上结果对于研究简并态半导体的自发辐射性质有重要的参考意义.

英文摘要:

Germanium (Ge) is considered as a promising material for silicon (Si) based light source. Based on tensile strain and n-type heavy doping approaches, the light emitting efficiency of Ce can be improved. Nevertheless, due to the difficulty in introducing large tensile strain into Ge, the photoluminescence or electroluminescence of Ge is demonstrated under degenerated states currently. Traditional spontaneous emission (SE) theory deduced from Boltzmann approximation is inapplicable for this case. To accurately analyze the SE properties of Ge, the influences of strain, temperature and doping on quasi-Fermi level and subsequent SE spectrum of degenerated Ge are theoretically investigated based on Fermi-Dirac distribution model. Owing to large density of states (DOS) in heavy hole (hh) the valance band (VB) and L valley, it is found that compressive strain has a negligible effect on the quasi-Fermi level under carrier concentration of 1019-1020 cm-3, while tensile strain is of benefit to the improvement of carrier occupation levels, leading to dramatic increases of both peak and integrated intensities of SE spectra. Although the peak intensity of SE from F-hh transition is larger than that from F-lh transition regardless of strain levels in Ge, the integrated intensities of SE from F-hh and F-lh transitions are almost equal. With the increase of sample temperature, the carriers acquire lager kinetic energy, resulting in more dispersive distribution of electrons (holes) in F valley (VB). However, more electrons (holes) are induced into conduction (valence) band at the same time. And according to Varshini's law the energy difference between F and L valleys is reduced at higher temperature. Thus, both the peak and integrated intensities of the SE spectra become larger at higher temperature. It is impressive that n-type doping can greatly enhance the SE intensity compared with p-type doping irrespective of strain levels in Ge, demonstrating the significance of n-type doping in the

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期刊信息
  • 《物理学报》
  • 北大核心期刊(2011版)
  • 主管单位:中国科学院
  • 主办单位:中国物理学会 中国科学院物理研究所
  • 主编:欧阳钟灿
  • 地址:北京603信箱(中国科学院物理研究所)
  • 邮编:100190
  • 邮箱:apsoffice@iphy.ac.cn
  • 电话:010-82649026
  • 国际标准刊号:ISSN:1000-3290
  • 国内统一刊号:ISSN:11-1958/O4
  • 邮发代号:2-425
  • 获奖情况:
  • 1999年首届国家期刊奖,2000年中科院优秀期刊特等奖,2001年科技期刊最高方阵队双高期刊居中国期刊第12位
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  • 被引量:49876