Enhanced hole injection is essential to achieve high performance in perovskite light-emitting diodes (LEDs). Here, a strategy is introduced to enhance hole injection by an electric dipole layer. Hopping theory demonstrates electric dipoles between hole injection layer and hole transport layer can enhance hole injection significantly. MoO₃ is then chosen as the electric dipole layer between PEDOT:PSS (hole injection layer) and PVK (hole transport layer) to generate electric dipoles due to its deep conduction band level. Theoretical results demonstrate that strong electric fields are produced for efficient hole injection, and recombination rate is substantially increased. Capacitance-voltage analyses further prove efficient hole injection by introducing the electric dipole layer. Based on the proposed electric dipole layer structure, perovskite LEDs achieve a high current efficiency of 72.7 cd A⁻¹, indicating that electric dipole layers are a feasible approach to enhance perovskite LEDs performance.

增强的空穴注入对于实现钙钛矿发光二极管（LED）的高性能至关重要。在这里，介绍了一种策略来增强电偶极子层的空穴注入。跳变理论表明，空穴注入层和空穴传输层之间的电偶极子可以显着增强空穴注入。MoO ₃然后，由于PEDOT：PSS（空穴注入层）和PVK（空穴传输层）之间的电偶极子层被选择，以因其深的导带能级而产生电偶极子。理论结果表明，产生了有效的空穴注入所需的强电场，并且复合率大大提高。电容电压分析通过引入电偶极层进一步证明了有效的空穴注入。基于提出的电偶极子层结构，钙钛矿LED实现了72.7 cd A ^-1的高电流效率，表明电偶极子层是提高钙钛矿LED性能的可行方法。