Characteristic of flexible β-Ga2O3 Schottky barrier diode based on mechanical stripping process

The flexible transverse β-Ga₂O₃ Schottky barrier diode (SBD) was fabricated by transferring the stripped β-Ga₂O₃ single crystal film onto muscovite, and its electrical characteristic under flat and bending conditions were tested. It is found that the forward current of the device after bending increases in the small voltage range of 0–1 V and decreases in the large voltage range of 1–4.5 V as the curvature increases. This result is attributed to the two mechanisms that the barrier height decreases and the scattering increases with the increase of the curvature. The decrease in barrier height makes it easier for electrons to migrate from the cathode to the anode in small voltage range, while the current decreases in large voltage range due to scattering. It is further found that the maximum transconductance (g_m) and subthreshold swing (SS) deteriorate with the increase of curvature and the corresponding voltage value of g_m drifts to the right. In addition, the switch ratio of the device under flat conditions is 10⁸, whereas in bending tests the switch ratio is 10⁷ which is only reduced by one order of magnitude and it is essentially the same as the current level under flat conditions.