“…An extensive review of Ga 2 O 3 material properties, processing routes and devices was recently published by Pearton et al, 3 while b-Ga 2 O 3 , in particular, was reviewed by Park et al 4 The material has, indeed, found a wide range of applications in various disciplines. Single-crystals of Ga 2 O 3 were synthesized by low-cost, melt growth techniques 5 and were implemented in power electronic devices with high breakdown voltages, as replacements for the costly SiC and GaN. 6 Thin layers of Ga 2 O 3 have been applied in solar cells, for example as an ultrathin tunneling layer in dye-sensitized solar cells 7 or as a passivation layer on silicon solar cells.…”