Figure 6From: Improved infrared photoluminescence characteristics from circularly ordered self-assembled Ge islands Temperature-dependent integrated PL intensity of Ge islands grown on (a) unpatterned substrate, and (b) patterned substrate (500-nm pitch). Solid lines show the fitting with one and two activation energies for (a) unpatterned and (b) patterned (500-nm pitch) substrates, respectively.Back to article page