Yong Zhang

Thermally tunable high-voltage breakdown and divergent avalanche nonlinearity in planar SnO2 nanofilm varistors

We present a planar, dopant-segregation-free SnO2 nanofilm varistor on a polycrystalline Al2O3 substrate that achieves a kilovolt-level breakdown voltage (V1 mA ≈ 759 V at 300 K). By directing the conduction pathway laterally across approximately 200 grain boundaries in series, this architecture overcomes the low-volta...