Figure 4
From: Challenges for room temperature operation of electrically pumped GeSn lasers
The carrier density as a function of temperature required to reach transparency for (a) 6%, (b) 10.5% and (c) 16% Sn unstrained material. Blue lines denote the total transparency carrier density, whilst the green and orange lines are the distribution of those carrier densities between the L and \(\Gamma\)-valleys. Markers denote the temperature and carrier density at which carriers in the L-valley account for 2% of threshold and we therefore deem to become ‘significant’. Levels of directness are quoted for T = 300 K.
