Patent ID: 8907333

Claim:
A field-effect transistor, comprising: a composite of layers, comprising: a dielectric layer; and a layer of aggregated pyrogenic zinc oxide primary particles bonded to the dielectric layer; wherein the aggregated pyrogenic zinc oxide primary particles are formed by oxidation of zinc or of a zinc compound in a flame; a mean aggregate diameter of the aggregated particles is from 70 to 200 nm, and the aggregates of the pyrogenic zinc oxide primary particles are of differing morphology, and comprise: 0 to 10% of a circular form; 30 to 50% of an ellipsoidal form; 30 to 50% of a linear form; and 20 to 30% of a branched form; wherein the pyrogenic zinc oxide particles have a BET surface area of 10 to 200 m 2 /g.