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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
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Composition engineering to obtain efficient hybrid perovskite light-emitting diodes
Chuanzhong Yan1, Kebin Lin1, Jianxun Lu1
1Institute of Luminescent Materials and Information Displays, College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, China.
Frontiers of Optoelectronics
|January 15, 2023
Summary
Composition engineering of metal halide perovskites significantly boosts light-emitting diode performance. Adding CsBr to methylammonium lead bromide perovskites enhances film quality, improving external quantum efficiency by dozens of times.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Chemistry
Background:
- Metal halide perovskites are promising for electroluminescence, with efficiencies exceeding 20% in perovskite light-emitting diodes (PeLEDs).
- Methylammonium lead bromide (CH3NH3PbBr3) is a key material, but its films suffer from poor surface coverage and crystallinity, limiting device performance due to leakage and recombination.
- Existing PeLEDs based on CH3NH3PbBr3 face challenges in achieving high efficiency and stability.
Purpose of the Study:
- To enhance the performance of methylammonium lead bromide perovskite light-emitting diodes through composition engineering.
- To address issues of low surface coverage, poor crystallinity, and nonradiative recombination in CH3NH3PbBr3 films.
- To develop a strategy for improving the external quantum and power efficiencies of PeLEDs.
Main Methods:
- Composition engineering of methylammonium lead bromide (CH3NH3PbBr3) perovskite films.
- Addition of excess CH3NH3Br to reduce pinholes in the perovskite films.
- Incorporation of Cesium Bromide (CsBr) to enhance crystalline quality and passivate nonradiative defects, forming (CH3NH3)1-xCaxPbBr3.
- Fabrication and characterization of (CH3NH3)1-xCaxPbBr3 based PeLEDs.
Main Results:
- The modified (CH3NH3)1-xCaxPbBr3 perovskite films exhibited improved surface coverage and crystallinity.
- The resulting PeLEDs demonstrated significantly enhanced performance, with an external quantum efficiency of 6.97%.
- Power efficiency reached 25.18 lm/W, a substantial improvement over pristine CH3NH3PbBr3 devices.
Conclusions:
- Composition engineering is a highly effective strategy for improving the quality of perovskite films for light-emitting applications.
- The developed (CH3NH3)1-xCaxPbBr3 material system offers a pathway to high-performance perovskite light-emitting diodes.
- This approach overcomes key limitations of traditional CH3NH3PbBr3, paving the way for advanced optoelectronic devices.
