Progress in bulk GaN growth<xref ref-type="fn" rid="cpb151014fn1">*</xref>

Progress in bulk GaN growth*

Xu Ke^a),^b)†, Wang Jian-Feng^a),^b), Ren Guo-Qiang^a),^b)

Thickness from 5 μm to 5 mm and panchromatic CL images: (a) 5 μm, 2 × 10⁸ cm⁻²; (b) 20 μm, 5 × 10⁷ cm⁻²; (c) 200 μm, 2 × 10⁷ cm⁻²; (d) 0.7 mm, 5 × 10⁶ cm⁻²; (e) 1.2 mm, 3 × 10⁶ cm⁻²; (f) 1.8 mm, 8 × 10⁵ cm⁻²; (g) 3 mm, 3.4 × 10⁵ cm⁻²; (h) 5 mm, 8.0 × 10⁴ cm⁻²; (i) the relation between thickness and DD.