The Synergy of the Buried Interface Surface Energy and Temperature for Thermal Evaporated Perovskite Light-Emitting Diodes

作者：Peng, Chencheng; He, Zhiyuan; Guo, Runda^*; Li, Xin; Chen, Hongting; Chen, Ben; Sun, Liang; Chen, Jiangshan; Wang, Lei^*

来源：ACS applied materials & interfaces, 2023, 15(12): 15768-15774.

DOI：10.1021/acsami.3c00376

• perovskite
• light-emitting diodes
• thermal evaporation method
• buried interface
• surface energy
• temperature

Multisource coevaporation is such a promising method for the preparation of perovskite films. However, there is limited research about the effects of the buried interface on thermal-evaporated perovskite light-emitting diodes (PeLEDs). In this study, the effects of buried interfaces on thermal -evaporated all-inorganic perovskite films are systematically investigated. It is found that the low-surface-energy buried interface promotes the formation of columnar grain by suppressing heterogeneous nucleation, and functional groups on the high-surface-energy interface have a significant effect on the actual element ratio of the film. The substrate temperature can affect the nucleation and film-formation kinetics of the columnar grains. As a result of the synergistic strategy, a peak external quantum efficiency (EQE) of 8.6% is achieved in the green PeLEDs with a stable emission peak at 516 nm, which is among the best thermal-evaporated PeLEDs reported. This work provides an insight into the preparation of perovskites by thermal evaporation and builds the groundwork for future studies.

• 单位
  华中科技大学