Air-Processed Perovskites Enabled by an Interface-Reconstruction Strategy for High-Performance Light-Emitting Diodes

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Perovskite quantum dots (QDs) are promising for optoelectronic devices.
• Fabricating high-performance perovskites in ambient air is challenging due to their sensitivity to moisture and oxygen.
• Low-cost, large-scale patterned manufacturing of perovskite-based light-emitting diodes (LEDs) requires ambient air processing.

Purpose of the Study:

• To demonstrate an interface-reconstruction strategy for air-processed CsPbI3 QD films.
• To enable the fabrication of high-performance LEDs using perovskite QDs processed in ambient air.
• To highlight the potential for low-cost, patterned manufacturing of optoelectronic devices.

Main Methods:

• Developed an interface-reconstruction strategy using ethyl acetate/tris(1-naphthyl)phosphine oxide (EA/TNPO) treatment.
• Polished and passivated the interface between the QD film and the electron transport layer.
• Fabricated LEDs using both spin-coated and inkjet-printed CsPbI3 QD films.

Main Results:

• Achieved a maximum external quantum efficiency (EQE) of 20.2% for spin-coated QD film LEDs.
• Demonstrated a long half-life of over 100 days for the fabricated LEDs.
• Showcased the potential for inkjet-printed QD films, indicating suitability for patterning techniques.

Conclusions:

• The interface-reconstruction strategy enables high-quality, air-processed perovskite QD films.
• This approach overcomes the moisture and oxygen sensitivity of perovskites for ambient air fabrication.
• The developed method holds significant promise for the future of low-cost optoelectronic devices, including LEDs.