Coated article with low-E coating having protective doped silver layer for protecting silver based IR reflecting layer(s), and method of making same

A coated article including a coating supported by a glass substrate, the coating comprising:

• a first dielectric layer on the glass substrate;
• an metallic or substantially metallic infrared (IR) reflecting layer comprising silver on the glass substrate located over at least the first dielectric layer;
• a protective layer comprising doped silver on the glass substrate located over and directly contacting the IR reflecting layer comprising silver;
• a second dielectric layer on the glass substrate located over at least the first dielectric layer, the IR reflecting layer comprising silver, and the protective layer comprising doped silver;
• wherein metal content of the protective layer comprising doped silver comprises from 80-99.5% Ag and from 0.5 to 20% Zn atomic %;
• and
• wherein the coating has a sheet resistance (Rs) of no greater than 11 ohms/square and a normal emissivity (En) of no greater than 0.2.

A coated article including a coating supported by a glass substrate, the coating comprising:

• a first dielectric layer on the glass substrate;
• an metallic or substantially metallic infrared (IR) reflecting layer comprising silver on the glass substrate located over at least the first dielectric layer;
• a protective layer comprising doped silver on the glass substrate located over and directly contacting the IR reflecting layer comprising silver;
• a second dielectric layer on the glass substrate located over at least the first dielectric layer, the IR reflecting layer comprising silver, and the protective layer comprising doped silver;
• wherein metal content of the protective layer comprising doped silver comprises from 80-99.5% Ag and from 0.5 to 20% Ni, atomic %;
• and
• wherein the coating has a sheet resistance (Rs) of no greater than 11 ohms/square and a normal emissivity (En) of no greater than 0.2.