Ultrathin two-dimensional graphitic carbon nitride as a solution-processed cathode interfacial layer for inverted polymer solar cells

Abstract

The utilization of two-dimensional graphitic carbon nitride (C₃N₄) nanosheets as a cathode interfacial layer (CIL) in inverted polymer solar cells (PSCs) is demonstrated. The device with C₃N₄ as a CIL exhibited a remarkable improvement in power conversion efficiency, indicating that C₃N₄ can effectively modify the BHJ/ITO interface to facilitate efficient electron collection. Our results indicate that the solution exfoliated C₃N₄ is a new and promising electron transport material for solution processed organic optoelectronic devices.