Exfoliated and bulk β-gallium oxide electronic and photonic devices

Monoclinic gallium oxide (β-Ga 2 O 3 ) has recently attracted increasing attention due to the availability of high quality, large diameter single crystals from mature melt growth methods and its attractive material properties of wide E G of 4.6–4.9 eV, good electron mobility (>200 cm 2 /Vs) and estimated E c of ~8 MV/cm. Compared to other ultra-wide bandgap materials, the inexpensive substrates lower the manufacturing cost for β-Ga 2 O 3 power devices. Applications of deep-UV detectors with solar blindness include inspection of high voltage transmission lines for corona and partial discharges, detection of fires and various defense systems. Si- and GaAs-based UV PDs are not truly solar-blind, as additional, bulky visible-light blocking filters are required. In this short review we discuss the use of bulk and exfoliated β-Ga 2 O 3 for these applications and relate this to the basic surfac…