Solution-Processed Back-Contact PEDOT:PSS/n-Si Heterojunction Solar Cells

The interdigitated back-contact structure makes the efficiency of single-junction crystalline silicon (c-Si) solar cells approach the theoretical limit. However, the complexity of fabrication process hinder its large-scale commercial application. Here, we have developed a back-contact Si-based solar cell with dopant-free heterojunction by solution process. Nafion film was used as a dual functional layer of passivation and antireflection, PEDOT:PSS film as a hole transport layer, and patterned lithium acetate film as an electron transport layer. The efficiency of the prepared back-contact heterojunction solar cell is 15.4%, and the short-circuit current density is up to 36.6 mA/cm2.