Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Innovates alcohol-soluble/self-doped PQAN-F for OSCs, solving solvent compatibility. This material exhibits a strong self-doping capability, which significantly improves the electron transport capacity of the device while endowing it with excellent electrical conductivity. The PCE represents a 40% enhancement compared to the device of w/o and the device's photovoltaic performance is comprehensively improved with practical potential.

ABSTRACT
As a key component of organic solar cells, the cathode interface layer (CIL) plays a crucial supporting role in enhancing the power conversion efficiency (PCE) and stability of the device. In this study, a nitrogen-containing polar side chain was introduced onto the electron-deficient group QA, which was then polymerized with fluorene units bearing alkyl side chains to obtain the material PQAN-F. After being integrated into the device, PQAN-F can generate interfacial dipoles at the cathode interface, which lowers the work function of the cathode material. Additionally, this material exhibits a strong self-doping capability, which significantly improves the electron transport capacity of the device while endowing it with excellent electrical conductivity. When the concentration is 0.50 mg mL−1, with a short-circuit current density (J
SC) of 16.01 mA cm−2 and a fill factor (FF) as high as 71.12%, the optimal PCE of 9.04% is achieved. This PCE represents a 40% enhancement compared to the device of w/o. The obtained results provide significant insights for the development of efficient cathode interface materials, while also offering an expanded basis to guide the design strategies employed in OSC interface engineering.