Figure 5
From: Challenges for room temperature operation of electrically pumped GeSn lasers
Bandgap as a function of Sn content and in-plane strain. Indirect compositions are greyed, whilst material with high tensile strain and large Sn concentrations that produce negative bandgap material are neglected. The coloured region therefore represents the composition space in which direct material can be achieved. The white marker illustrates the devices investigated in this work. White dashed lines depict \(E_g-\Delta _{SO}\).
