Patent ID: 8440037

Claim:
A method of making a heat treated coated article comprising a coating supported by a glass substrate, the method comprising: sputter-depositing a first dielectric layer comprising silicon nitride over at least the glass substrate; sputter-depositing a first layer comprising zinc oxide over at least the layer comprising silicon nitride, the first layer comprising zinc oxide thickness from 40-150 Å; sputter-depositing a first infrared (IR) reflecting layer comprising silver over and contacting the first layer comprising zinc oxide; sputter-depositing a second dielectric layer comprising silicon nitride on the glass substrate over at least the first IR reflecting layer; sputter-depositing a second layer comprising zinc oxide over at least the first IR reflecting layer and the first and second dielectric layers comprising silicon nitride, the second layer comprising zinc oxide having a thickness of from 40-150 Å; sputter-depositing a second IR reflecting layer comprising silver over and contacting the second layer comprising zinc oxide; sputter-depositing a layer comprising an oxide of NiCr over and contacting the second IR reflecting layer by sputtering a target comprising NiCr in an atmosphere comprising at least argon gas and a significant amount of oxygen gas, so that the layer comprising the oxide of NiCr is an oxide as it is sputter-deposited on the substrate; sputter-depositing a third layer comprising zinc oxide over and contacting the layer comprising the oxide of NiCr; depositing another dielectric layer located over at least the third layer comprising zinc oxide; wherein, following said depositing steps, the layer comprising the oxide of NiCr is fully oxidized; and heat treating the coated article after the aforesaid layers have been deposited on the glass substrate, so that when measured monolithically following heat treatment the coated article has a visible transmission of at least 80%, a sheet resistance (R s ) of less than or equal to 2.5 ohms/square, and a normal emissivity (E) of less than or equal to about 0.04.