Reducing hole trap densities in quasi-2D light-emitting perovskites

Quasi-two-dimensional (quasi-2D) metal halide perovskite materials possess excellent luminescent properties and suppressed trap-assisted recombination losses, having attracted much attention in the field of light-emitting diodes. Reducing the density of charge traps is essential for the further improvements of device performance. However, investigations in this direction have been limited. In this work, we study the role of some molecular additives on the suppression of trap density in quasi-2D perovskite light-emitting materials. We show that the molecular additives have a considerable effect on the reduction of hole trap density as evident in our space-charge limited current (SCLC) analysis for single-carrier devices, leading to enhanced luminescence properties. Our work contributes to the development of quasi-2D perovskite emitters for efficient LEDs.