THz intersubband electroluminescence from n-type Ge/SiGe quantum cascade structures
THz intersubband electroluminescence from n-type Ge/SiGe quantum cascade structures
复制标题
n 型 Ge/SiGe 量子级联结构的太赫兹子带间电致发光
DOI:
--
复制
发表时间:
2021
影响因子:
4
通讯作者:
G. Scalari
中科院分区:
文献类型:
--
作者:
D. Stark;M. Mirza;L. Persichetti;M. Montanari;S. Markmann;M. Beck;T. Grange;S. Birner;M. Virgilio;C. Ciano;M. Ortolani;C. Corley;G. Capellini;L. Di Gaspare;M. De Seta;D. Paul;J. Faist;G. Scalari
We report electroluminescence originating from L-valley transitions in n-type Ge/Si0.15Ge0.85 quantum cascade structures centered at 3.4 and 4.9 THz with a line broadening of Δ f / f ≈ 0.2. Three strain-compensated heterostructures, grown on a Si substrate by ultrahigh vacuum chemical vapor deposition, have been investigated. The design is based on a single quantum well active region employing a vertical optical transition, and the observed spectral features are well described by non-equilibrium Green's function calculations. The presence of two peaks highlights a suboptimal injection in the upper state of the radiative transition. Comparison of the electroluminescence spectra with a similar GaAs/AlGaAs structure yields one order of magnitude lower emission efficiency.
影响因子:
7.4
作者:
Klocke, Jessica L.;Mangold, Markus;Kottke, Tilman
通讯作者:
Kottke, Tilman
影响因子:
4
作者:
Gallacher, K.;Velha, P.;Leadley, D. R.
通讯作者:
Leadley, D. R.