Figure 2
From: Challenges for room temperature operation of electrically pumped GeSn lasers
(a) The threshold current as a function of pressure (normalised to atmospheric pressure), where diamond and circular markers illustrate two devices with the same heterostructure. The blue, green and orange dashed lines show the pressure dependencies of the leakage, defect and radiative recombination processes, with the radiative uncertainty indicated by the shaded region. The top axis denotes the modelled levels of directness in the active region material. A subset of the LI curves with increasing pressure used to determine threshold are shown in the inset. (b) The variation in fractional contributions of each process to the total threshold as a function of pressure, extrapolated from the fit in (a).
