Patent ID: 6316819
Filing Date: 2001-11-13
Classification: H01L

Abstract:
A multilayer ZnO polycrystalline diode that protects against electrostatic discharges, over-current, and voltage surges comprising:a polycrystalline system formed by a network of elementary ZnO diodes, each elementary ZnO diode comprising at least one ZnO grain and a balance layer of Bi.sub.2 O.sub.3 surrounding the at least one ZnO grain, wherein the polycrystalline system is formed into a block having a first lateral side and a second lateral side, and a plurality of polycrystalline parallel layers, wherein each layer comprises:ZnO;Bi.sub.2 O.sub.3 in the range of 2.5 to 4% by weight;Sb.sub.2 O.sub.3 in the range of 0 to 5% by weight;Co.sub.3 O.sub.4 in the range of 0.6 to 0.9% by weight;Mn.sub.3 O.sub.4 in the range of 0.6 to 1.2% by weight;Nb.sub.2 O.sub.5 in the range of 0 to 0.4% by weight; andFe.sub.3 O.sub.4 in the range of 0 to 0.2% by weight.