Patent ID: 7153708

Claim:
A method of forming a ferroelectric thin film on a high-k layer, comprising: preparing a silicon substrate; forming a high-k layer on the substrate and annealing the high-k layer to form an oxide layer; preparing a PGO precursor solution; depositing a seed layer of ferroelectric material on the high-k oxide layer, wherein said depositing a seed layer includes depositing a layer of c-axis oriented PGO thin film at a temperatures of between about 500° C. to 540° C., at a pressure of between about 1 torr to 5 torr, in an atmosphere having an oxygen partial pressures of between about 20% to 30%, at a vaporizer temperature of between about 180° C. to 200° C.; wherein the precursor solution has a delivery rate of between about 0.05 ml/min to 0.1 ml/min, for a deposition time of between about 5 minutes to 20 minutes; depositing a top layer of ferroelectric material on the seed layer at a relatively low temperature, wherein said depositing a top ferroelectric layer includes depositing a PGO thin film at a deposition temperatures of between about 380° C. and 420° C., wherein the deposition pressure is between about 5 torr to 10 torr, in an atmosphere having an oxygen partial pressure of between about 30% to 40%, at a vaporizer temperature of between about 200° C. to 240° C., wherein the precursor solution delivery rate is between about 0.1 ml/min to 0.2 ml/min; and wherein the deposition time is between about one hour to three hours; and annealing the substrate, the high-k layer and the ferroelectric layers to form a ferroelectric thin film, wherein said annealing includes annealing at a temperature of between about 520° C. to 560° C. for between about thirty minutes and one hour in a pure oxygen atmosphere.