Self Aligned Contacts for Solar Cells
Fabrication methods for forming self aligned contacts for back contact solar cells are provided.
1 . A back contact back junction thin solar cell, comprising:
a deposited semiconductor layer, comprising:
a light capturing frontside surface with a passivation layer,
a doped base region, and
a doped backside emitter region with a polarity opposite said doped base region;
a backside passivation dielectric layer and patterned reflective layer on said backside emitter region;
self aligned backside emitter contacts and backside base contacts connected to metal interconnects forming a first level interdigitated metallization pattern on the backside of said back contact back junction thin solar cell; and
at least one permanent support reinforcement positioned on the backside of said back contact back junction thin solar cell; and
a second metal layer which is separated from the first layer by said permanent backside support reinforcement structure, said second layer contacting to said first level metallization pattern locally through an interdigitated pattern of holes in said permanent backside support reinforcement structure.