Figure 4.

PL measurements at T = 3.5 K of several type I samples. a Reference sample without filling, b reference sample without LDE step, cf samples with LDE and filling where df was varied as indicated. The laser energy was 2.33 eV, and the excitation power Ie = 450 W/cm2

Heyn et al. Nanoscale Research Letters 2009 5:576-580   doi:10.1007/s11671-009-9507-3