Figure 3.

SEM images of the GaN surface morphologies. The etching time is (a) 0 min (b) 5 min, and (c) 10 min. The cracks extend along the (1010) plane. (d) This is an optical micrograph of the cracks. This image is a transmitted image (10.5 mm × 8.5 mm).

Liu et al. Nanoscale Research Letters 2011 6:69   doi:10.1186/1556-276X-6-69
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