Login / Signup

Rational adjustment to interfacial interaction with carbonized polymer dots enabling efficient large-area perovskite light-emitting diodes.

Fan YangQingsen ZengWei DongChunyuan KangZexing QuYue ZhaoHaotong WeiWei-Tao ZhengXiaoyu ZhangBai Yang
Published in: Light, science & applications (2023)
Film uniformity of solution-processed layers is the cornerstone of large-area perovskite light-emitting diodes, which is often determined by the 'coffee-ring effect'. Here we demonstrate a second factor that cannot be ignored is the solid-liquid interface interaction between substrate and precursor and can be optimized to eliminate rings. A perovskite film with rings can be formed when cations dominate the solid-liquid interface interaction; whereas smooth and homogeneous perovskite emitting layers are generated when anions and anion groups dominate the interaction. This is due to the fact that the type of ions anchored to the substrate can determine how the subsequent film grows. This interfacial interaction is adjusted using carbonized polymer dots, who also orient the perovskite crystals and passivate their buried traps, enabling a 225 mm 2 large-area perovskite light-emitting diode with a high efficiency of 20.2%.
Keyphrases
  • room temperature
  • ionic liquid
  • high efficiency
  • solar cells
  • light emitting
  • fluorescent probe
  • molecular dynamics simulations
  • molecularly imprinted