Patent ID: 8980066
Filing Date: 2015-03-17
Classification: C23C,H01J,H01L,Y02E

Abstract:
1. A sputtering method comprising: flowing an oxygen containing gas, an inert gas, and a nitrogen containing gas into a processing chamber; applying a DC electrical bias to a sputtering target comprising a dopant and one or more metals selected from the group consisting of zinc, gallium, cadmium, indium, and tin; depositing a semiconductor layer on a substrate, the semiconductor layer comprising the one or more metals, the dopant, oxygen, and nitrogen, wherein at least a portion of the semiconductor layer comprises an oxynitride compound; increasing the ratio of the flow rates of the nitrogen containing gas to the oxygen containing gas during deposition of the semiconductor layer to increase electron mobility of the semiconductor layer, wherein the ratio of the flow rates of the nitrogen containing gas to the oxygen containing gas is above about 10:1, wherein the oxygen containing gas has a flow rate of greater than 10 sccm, and wherein the semiconductor layer has an electron mobility that is greater than 20 times an electron mobility of amorphous silicon; and annealing the deposited semiconductor layer at a temperature above about 250 degrees Celsius, wherein the semiconductor layer has an electron mobility of greater than 90 cm