Kesterite tech news
On October 14, 2026, researchers from the Rajshahi University of Engineering and Technology published a study in Next Materials outlining a carbon--electrode monolithic two--terminal (2T) tandem photovoltaic architecture pairing a lead--free double perovskite (Cs₄CuSb₂Cl₁₂) top absorber with an earth--abundant kesterite (CZTSe) bottom cell. A major barrier to commercializing kesterite--based tandem solar cells has been current mismatching, interfacial recombination, and high contact resistances. To mitigate these losses, the proposed cell configuration (FTO/MZO/Cs₄CuSb₂Cl₁₂/ZnO:Al/CdS/CZTSe/Cu₂O/C) eliminates the conventional hole transport layer from the top subcell, allowing a broader filtered light spectrum to reach the underlying kesterite layer and dramatically enhancing bottom--cell photocurrent generation. The integration of low--cost carbon electrodes in place of noble metals further enhances thermal durability and substantially lowers manufacturing costs, presenting an eco--friendly and scalable roadmap for next--generation tandem solar deployment.