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Morphology Engineering for High-Performance and Multicolored Perovskite Light-Emitting Diodes with Simple Device
Zhibin Wang1, Tai Cheng1, Fuzhi Wang1
1State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Novel Thin Film Solar Cells, North China Electric Power University, Beijing, 102206, China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 9, 2016
Summary
Achieving high-performance perovskite films for light-emitting diodes (PeLEDs) is possible through morphology engineering. This study demonstrates efficient, additive-free perovskite films for vibrant, full-color displays.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Film morphology is critical for solution-processed perovskite devices.
- Optimizing morphology can enhance device performance without additives or post-treatments.
Purpose of the Study:
- To achieve a full-coverage, high quantum yield perovskite film via morphology engineering.
- To fabricate high-performance perovskite light-emitting diodes (PeLEDs) using a simple device structure.
Main Methods:
- One-step spin-coating method for perovskite film fabrication.
- Investigated MAPbBr3 film characteristics with varying MABr:PbBr2 ratios using SEM, AFM, XRD, PL, and TRPL.
- Fabricated PeLEDs with a simple device structure (ITO/PEDOT:PSS/perovskite/TPBi/Ca/Al).
Main Results:
- Achieved a full-coverage, high quantum yield perovskite film through morphology control.
- Demonstrated a green PeLED based on MAPbBr3 with high luminance (8794 cd m⁻²) and current efficiency (5.1 cd A⁻¹).
- Developed hybrid PeLEDs with adjustable halide ratios (MAPbX3) exhibiting bright, narrow-band emission across a wide color gamut.
Conclusions:
- Morphology engineering is a viable strategy for high-performance perovskite films and devices.
- The developed PeLEDs offer efficient light emission and tunable colors for display applications.
- Additive-free fabrication methods pave the way for simpler and more scalable perovskite device production.
