Ni/TiO2/ $ beta$-Ga2O3 Heterojunction Diodes with NiO Guard Ring Simultaneously Increasing Breakdown Voltage and Reducing Turn-on Voltage. - Jeremiah Williams; Nolan S. Hendricks; Weisong Wang; Aaron Adams; Joshua Piel; Daniel Dryden; Kyle J. Liddy; Nicholas Sepelak; Bradley Morell; Adam Miesle; Ahmad Islam; Andrew J. Green (DRC, 2023)