Abstract: The present invention relates to a solar cell (1) comprising a substrate (2) of p-type silicon or n-type silicon, wherein the substrate (2) comprises—a front side (2a) the surface of which is at least partially covered with at least one passivation layer (3) and—a back side (2b), wherein—the back side (2b) of the substrate (2) is at least partially covered with a passivation layer (4) having a thickness sufficient to allow a transport of holes through it, and—the passivation layer (4) on the backside 2b) of the substrate (2) is at least partially cov-ered with a conductive polymer layer (5). The present invention also relates to a process for the preparation of a solar cell, to a solar cell obtainable by this process and to a solar module.

Abstract: The present invention relates to a solar cell (1) comprising a substrate (2) of p-type silicon or n-type silicon, wherein the substrate (2) comprises a front side (2a) the surface of which is at least partially covered with at least one passivation layer (3) and a back side (2b), wherein the back side (2b) of the substrate (2) is at least partially covered with a conductive polymer layer (4) and wherein at least one of the following conditions a) and b) is fulfilled: a) the conductive polymer layer (4) is at least partially in direct contact with the surface of the p-type or n-type silicon; b) the conductive polymer layer (4) comprises a cationic conductive polymer and a polymeric anion in a weight ratio cationic conductive polymer:polymeric anion of greater than 0.4. The present invention also relates to a process for the preparation of a solar cell, to a solar cell obtainable by this process and to a solar module.