Air-processed efficient and pure green perovskite LEDs based on a PVP-modified NiO_x interface layer

Area of Science:

• Materials Science
• Optoelectronics
• Chemistry

Background:

• Perovskite light-emitting diodes (PeLEDs) are promising optoelectronic devices.
• Moisture instability significantly limits the commercialization of PeLEDs.
• Defects and poor film quality contribute to PeLED instability and performance loss.

Purpose of the Study:

• To enhance the moisture stability and performance of PeLEDs.
• To improve perovskite film quality and reduce trap density using modified NiO_x films.
• To achieve high-performance air-processed PeLEDs.

Main Methods:

• Fabrication of PVP-modified NiO_x films.
• Deposition of perovskite films onto modified NiO_x layers.
• Characterization of perovskite film quality and trap density.
• Fabrication and testing of PeLED devices.

Main Results:

• PVP-modified NiO_x films resulted in perovskite films with improved quality.
• Reduced trap density was observed in the perovskite films.
• The champion PeLED device achieved an external quantum efficiency (EQE) of 16.05%.
• This represents the highest performance for air-processed PeLEDs reported to date.

Conclusions:

• PVP-modified NiO_x is an effective strategy for enhancing PeLED performance and stability.
• Improved perovskite film quality and reduced defects are key to achieving high-efficiency air-processed PeLEDs.
• The developed method offers a pathway towards commercializing stable and high-performance PeLEDs.