Patent ID: 7910393

Claim:
A method for forming a dual-doped emitter on a silicon substrate with a sub-critical shear thinning nanoparticle fluid, the silicon substrate comprising a front surface and a rear surface, the method comprising: texturing the silicon substrate; cleaning the silicon substrate; depositing the sub-critical shear thinning nanoparticle fluid on the front surface; baking the silicon substrate at a first temperature of between about 150° C. to about 800° C. and for a first time period between about 1 minute and about 60 minutes; exposing the silicon substrate to a dopant source in a diffusion furnace with an atmosphere of POCl 3 , N 2 , and O 2 , at a second temperature of between about 800° C. and about 950° C., and for a second time period of between about 30 minutes and about 180 minutes, wherein a PSG layer is formed; removing the PSG layer; depositing an anti-reflection coating on the front surface; and depositing a set of front metal contacts on the front surface and a set of rear metal contacts on the rear surface.