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梯度掺杂结构GaN光电阴极的稳定性

李飙 任艺 常本康

李飙, 任艺, 常本康. 梯度掺杂结构GaN光电阴极的稳定性[J]. 中国光学, 2018, 11(4): 677-683. doi: 10.3788/CO.20181104.0677
引用本文: 李飙, 任艺, 常本康. 梯度掺杂结构GaN光电阴极的稳定性[J]. 中国光学, 2018, 11(4): 677-683. doi: 10.3788/CO.20181104.0677
LI Biao, REN Yi, CHANG Ben-kang. Stability of gradient-doping GaN photocathode[J]. Chinese Optics, 2018, 11(4): 677-683. doi: 10.3788/CO.20181104.0677
Citation: LI Biao, REN Yi, CHANG Ben-kang. Stability of gradient-doping GaN photocathode[J]. Chinese Optics, 2018, 11(4): 677-683. doi: 10.3788/CO.20181104.0677

梯度掺杂结构GaN光电阴极的稳定性

doi: 10.3788/CO.20181104.0677
基金项目: 

国家自然科学基金项目 No.61171042

详细信息
    作者简介:

    李飙(1974-), 男, 河南太康人, 博士, 讲师, 主要从事光电材料性能评估与检测方面的研究。E-mail:libiao2006@126.com

  • 中图分类号: O433;TN203

Stability of gradient-doping GaN photocathode

Funds: 

National Natural Science Foundation of Chin No.61171042

More Information
  • 摘要: 利用GaN光电阴极多信息量测试评估系统,对反射式梯度掺杂和均匀掺杂GaN光电阴极样品进行了激活及衰减后的量子效率测试,并测试衰减速率。在同样的衰减时间内,和均匀掺杂样品相比,梯度掺杂样品的衰减比例较小,衰减速率较慢,其原因在于梯度掺杂结构可在其发射层内部产生系列内建电场,致使其能带连续向下弯曲,导致其表面真空能级比均匀掺杂样品下降得更低,发射层表面形成的负电子亲和势更明显,造成发射层内的光生电子更易逸出,阴极量子效率的衰减变慢,从而使其稳定性强于均匀掺杂结构。
  • 图  1  反射式均匀掺杂样品A和梯度掺杂样品B结构图

    Figure  1.  Structure of reflection-mode uniform-doping sample A and gradient-doping sample B

    图  2  样品A和B在激活结束后的量子效率测试曲线

    Figure  2.  Quantum efficiency curves of sample A and sample B after activation

    图  3  样品A和B的量子效率测试曲线

    Figure  3.  Quantum efficiency curves of GaN photocathodes in variable conditions

    图  4  样品A和B的相对稳定性测试曲线

    Figure  4.  Curves of relative sensitivity for sample A and B

    图  5  反射式GaN光电阴极的表面势垒示意图

    Figure  5.  Surface potential barrier of reflection-mode GaN photocathode

    图  6  均匀掺杂样品A和梯度掺杂样品B能带结构示意图(Ec为导带能级,Ev为价带能级,EF为费米能级,E0为真空能级,Eg为GaN的禁带宽度)

    Figure  6.  Energy band structure of uniform-doping sample A and gradient-doping sample B(EC is the conduction band minimum, EV is the valence band maximum, EF is the Fermi level, E0 is the vacuum level, Eg is the band gap)

    表  1  均匀掺杂样品A的衰减测试结果

    Table  1.   Quantum efficiency attenuation test results of sample A

    波长/nm240260280300320340
    激活后QE/%513627201614
    12 h后QE/%4225169.86.24.9
    衰减比例/%17.630.640.74661.265
    注:衰减比例为(激活后QE-12 h后QE)/激活后QE。
    下载: 导出CSV

    表  2  梯度掺杂样品B的衰减测试结果

    Table  2.   Quantum efficiency attenation test results of sample B

    波长/nm240260280300320340
    激活后QE/%574436282421
    12 h后QE/%483224181310
    衰减比例/%15.827.333.335.745.852.4
    注:衰减比例为(激活后QE-12 h后QE)/激活后QE。
    下载: 导出CSV

    表  3  样品A和样品B的衰减速率测试结果

    Table  3.   Attenuation rate test results of decadence rate for uniform-doping sample A and gradient-doping sample B

    衰减速率(a.u/h)
    测试时间/h24681012
    梯度掺杂样品B3219.112.710.44.74.6
    均匀掺杂样品A403019.117.614.38.3
    注:衰减速率为(测试值1-测试值2)×100/测试值1。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-12-27
  • 修回日期:  2018-01-30
  • 刊出日期:  2018-08-01

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