Abstract
The temperature dependence of threshold current density (Jth) for GaAs/AlxGa1-xAs terahertz quantum cascade lasers (THz-QCLs) with different Al barrier compositions is studied. We achieved a maximum operation temperature (Tmax) of 143 K for a 3.7 THz QCL by employing a longitudinal-optical (LO) phonon depopulation scheme. High-Al-composition barriers are used for increasing averaged LO-phonon energy. A significant reduction in Jth of approximately 30% was obtained by increasing the Al composition from 15 to 35%, when we used the same energy separation of the depopulation stats (E21). Tmax could be increased by using high-Al-composition structures due to the reduction of thermally-activated LO-phonon scattering.
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