Patent ID: 8394658

Claim:
A method of forming a multi-doped junction on a substrate, comprising: providing the substrate doped with phosphorous atoms, the substrate comprising a front substrate surface; depositing an ink on the front substrate surface in a ink pattern, the ink consisting essentially of a set of undoped nanoparticles and a set of solvents; heating the substrate in a baking ambient to a first temperature and for a first time period in order to create a densified film ink pattern; exposing the substrate to a dopant source in a diffusion furnace with a deposition ambient, the deposition ambient comprising BBr 3 , a carrier N 2 gas, a main N 2 gas, and a reactive O 2 gas at a second temperature and for a second time period, wherein a first BSG layer with a first boron amount is formed on the front substrate surface and a second BSG layer with a second boron amount is formed on the densified film ink pattern, and wherein the second boron amount is substantially greater than the first boron amount; and heating the substrate in a drive-in ambient to a third temperature; wherein a first diffused region with a first sheet resistance is formed under the front substrate surface covered by the densified film ink pattern, and a second diffused region with a second sheet resistance is formed under the front substrate surface not covered with the densified ink pattern, and wherein the first sheet resistance is substantially smaller than the second sheet resistance.