Altering the Optoelectronic Properties of the PEDOT:PSS Hole Transport Layer with Sodium Polystyrenesulfonate to Enhance the Efficiency and Stability of Perovskite Light-Emitting Diode

, high external quantum efficiency (EQE) of 10.05%, and current and power efficiency of 40.89 cd/A and 35.95 lm/W, respectively. Most notable advantage of the Na-PSS-modified HTL is the significant improvement in the operational stability of the Pe-LED devices, with the electroluminescent (EL) lifetime 4 times longer in comparison to that of Pe-LED devices having pristine PEDOT:PSS as HTL.