Printable Counter Electrode with Metal Nitride as the Conductive Medium for Perovskite Solar Cells

Perovskite solar cells (PSCs) with a booming high power conversion efficiency (PCE) are on their road toward industrialization. A proper design of the counter electrode (CE) with low cost, high conductivity, chemical stability, and good interface contact with the other functional layer atop the perovskite layer is vital for the overall performance of PSCs. Herein, the application of titanium nitride (TiN) is reported as a conductive medium for the printable CE in hole-conductor-free mesoscopic PSCs. TiN improves the conductivity of the CE and reduces the resistivity from 20 to 10 m omega center dot cm. TiN also improves the wettability of the CE with perovskite and enhances the back interface contact, which promotes charge collection. On the other hand, TiN is chemically stable during processing and undergoes no distinguishable chemical reaction with halide perovskite. Devices with TiN as the conductive media in the CE deliver a champion PCE of 19.01%. This work supplies a considerable choice for the CE design of PSCs toward industrial applications. The application of titanium nitride (TiN) nanoparticles is reported as the conductive medium in the printable counter electrode for perovskite solar cells (PSCs). TiN improves the conductivity of the electrode and enhances the contact at the back contact, bringing an impressive power conversion efficiency of 19.01% for printable hole-conductor-free PSCs.image