Enhancing device performance of CsPbBr₃ perovskite light-emitting diodes with Cs₂CO₃ modification layer and dual additives

This study presents the performance of CsPbBr₃ perovskite light-emitting diodes (PeLEDs) with a cesium carbonate (CsCO₃) modification layer and dual additives. With the Cs₂CO₃ modification layer, the poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) hole transport layer was recrystallized to flatten the grains, reduce the series resistance, lower the impedance, and operate at a low level. It also has the lowest starting voltage at 3 V, which can release equivalent energy from electrons and holes. At 6 V, it has a maximum luminance of 16440 cd/m² and an external quantum efficiency (EQE) of 1.56%.