Patent ID: 9722131
Date: 2017-08-01
CPC Classifications: H01L,Y02E,Y02P

Claim:
1. A method of manufacturing a delta-doped interconnection tunnel junction, comprising: growing epitaxially a first highly doped layer of a tunnel diode on a first photovoltaic subcell or growing epitaxially the first photovoltaic subcell on the first highly doped layer, the first photovoltaic subcell having a dopant concentration less than the first highly doped layer, said first layer using a first dopant; depositing a delta-doped layer of a second dopant of a same acceptor/donor type as said first dopant on said first highly doped layer of said tunnel diode, said second dopant in said delta-doped layer reaching a dopant concentration substantially greater than a concentration of said first dopant in said first highly doped layer of said tunnel diode; and growing epitaxially a second highly doped layer of said tunnel diode on said delta-doped layer, said second layer using a third dopant of a complementary acceptor/donor type to said first dopant and said second dopant; wherein the delta doped layer has an upper surface and a lower surface, the lower surface is directly adjacent to the first highly doped layer and the upper surface is directly adjacent to the second highly doped layer; wherein each of the first highly doped layer and the second highly doped layer have a dopant concentration in a range greater than 1×10