Behavior of above‐gap NN pair states in radiative recombination in GaAs1−xPx: N+(x=0.24, 77°K)
作者:
M. H. Lee,
N. Holonyak,
J. C. Campbell,
W. O. Groves,
M. G. Craford,
期刊:
Journal of Applied Physics
(AIP Available online 1974)
卷期:
Volume 45,
issue 4
页码: 1775-1778
ISSN:0021-8979
年代: 1974
DOI:10.1063/1.1663489
出版商: AIP
数据来源: AIP
摘要:
Photoluminescence and laser data (77°K) are presented, clarifying the role of the NN pair states in above‐gap radiative transitions. Heavily Te‐doped (1019/cm3) and N‐doped (≳ 1019/cm3)x=0.24 vapor phase epitaxial GaAs1−xPxsamples are prepared to ensure a large doped‐in supply of electrons in NN pairs states. Identical samples, but without N+doping (N+‐doped layer etched off), are examined for comparison. Nitrogen‐free samples lase at energies as high as 60 meVabove Eg(&Ggr;); the N+‐doped samples lase at significantly higher threshold and at energieshv≲Eg(&Ggr;), where resonance enhancement is large. The addition of Zn (via diffusion) to convert then‐type N‐doped crystal toptype removes the built‐in electron supply from the NN pair states and permits laser operation on the donor band tail at relatively low energy and low threshold, which shows that the N impurity does not damage the crystal. While the N trap is most useful in GaAs1−xPxin the region near the direct‐indirect transition (x≡xc≈0.46, 77°K) and in the indirect range (x>xc), these and related data indicate that the N trap detracts from the radiative recombination process in the direct range (x≪xc).
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