Patent ID: 8138070

Claim:
A method of forming a multi-doped junction, comprising: (A) providing a first substrate and a second substrate; (B) depositing a first ink on a first surface of each of the first substrate and the second substrate, the first ink comprising a first set of nanoparticles and a first set of solvents, the first set of nanoparticles comprising a first concentration of a first dopant; (C) depositing a second ink on a second surface of each of the first substrate and the second substrate, the second ink comprising a second set of nanoparticles and a second set of solvents, the second set of nanoparticles comprising a second concentration of a second dopant; (D) placing the first substrate and the second substrate in a back to back configuration; (E) heating the first substrate and the second substrate in a first drive-in ambient to a first temperature and for a first time period; (F) exposing the first substrate and the second substrate in the back to back configuration to a deposition ambient, the deposition ambient comprising POCl 3 , a carrier N 2 gas, a main N 2 gas, and a reactive O 2 gas for a second time period; and (G) heating the first substrate and the second substrate in a second drive-in ambient to a third temperature for a third time period.