A solar cell serial interconnect comprising: a bottom electrode layer; a first patterned line opening in the bottom electrode layer that separates the bottom electrode layer into a first bottom electrode layer of a first cell and a second bottom electrode layer of a second cell; a subcell layer over the bottom electrode layer; a second patterned line opening in the subcell layer that separates the subcell layer into a first subcell layer of the first cell and a second subcell layer of the second cell, the second patterned line opening including a first sidewall along the first subcell layer and a second sidewall along the second subcell layer laterally opposite to the first sidewall; a non-metallic intermediate layer (230, 235) along the first sidewall and the second sidewall of the second patterned line opening; a continuous conformal charge transport layer that spans over the first subcell layer, the second subcell layer, on the non-metallic intermediate layer within the second patterned line opening, and over the second bottom electrode layer within the second patterned line opening; wherein the continuous conformal charge transport layer has a resistivity greater than 0.1 ohm.cm and is less than 1,000 nm thick; a top electrode layer over the continuous conformal charge transport layer and on the continuous conformal charge transport layer within the second patterned line opening; and a third patterned line opening in the top electrode layer that separates the top electrode layer into a first top electrode layer of the first cell and a second top electrode layer of the second cell; wherein the second bottom electrode layer of the second subcell and the first top electrode layer of the first subcell are serially interconnected. a bottom electrode layer; a first patterned line opening in the bottom electrode layer that separates the bottom electrode layer into a first bottom electrode layer of a first cell and a second bottom electrode layer of a second cell; a subcell layer over the bottom electrode layer; a second patterned line opening in the subcell layer that separates the subcell layer into a first subcell layer of the first cell and a second subcell layer of the second cell, the second patterned line opening including a first sidewall along the first subcell layer and a second sidewall along the second subcell layer laterally opposite to the first sidewall; a non-metallic intermediate layer (230, 235) along the first sidewall and the second sidewall of the second patterned line opening; a continuous conformal charge transport layer that spans over the first subcell layer, the second subcell layer, on the non-metallic intermediate layer within the second patterned line opening, and over the second bottom electrode layer within the second patterned line opening; wherein the continuous conformal charge transport layer has a resistivity greater than 0.1 ohm.cm and is less than 1,000 nm thick; a top electrode layer over the continuous conformal charge transport layer and on the continuous conformal charge transport layer within the second patterned line opening; and a third patterned line opening in the top electrode layer that separates the top electrode layer into a first top electrode layer of the first cell and a second top electrode layer of the second cell; wherein the second bottom electrode layer of the second subcell and the first top electrode layer of the first subcell are serially interconnected.