PL spectra from the as-grown sample etched for 60 min and samples after different chemical treatments. The spectrum from the as-grown sample is denoted by (1), the sample after an HF dip by (2), after HF/piranha by (3), and after HF/piranha/HF by (4). The vertical dashed line is a guide to the eye.
Leontis et al. Nanoscale Research Letters 2013 8:383 doi:10.1186/1556-276X-8-383