Homogeneous Cu2ZnSnSe4 nanocrystals/graphene oxide nanocomposites as hole transport layer for polymer solar cells

- Homogeneous Cu2ZnSnSe4 NCs/graphene oxide nanocomposites were solution-processed.
- Introduction of graphene oxide improves the dispersion of pyridine treated NCs.
- The charge carrier transport capacity of nanocomposites as buffer layer increases.
- It affords an efficient way to prepare solution-processed polymer solar cells.