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High-performance multijunction perovskite LEDs with reduced interconnection loss
Feiyun Zhao1,2, Haifeng Zhao1,3, Zhennan Tian4
1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China.
Nature Communications
|July 17, 2026
Summary
We developed a novel interconnection layer (ICL) for tandem perovskite LEDs, significantly improving efficiency and brightness. This breakthrough enables robust, high-performance perovskite light sources with reduced voltage loss.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Tandem light-emitting diodes (LEDs) promise enhanced efficiency and brightness.
- Solution-processed perovskite LEDs face challenges with interconnection strategies, leading to voltage penalties and poor robustness.
Purpose of the Study:
- To develop a novel interconnection strategy for solution-processed perovskite LEDs.
- To improve the efficiency, brightness, and robustness of tandem perovskite LEDs.
Main Methods:
- Fabrication of a hierarchically structured interconnection layer (ICL) with a near-degenerate charge-generation junction and a crystalline-amorphous oxide composite.
- Integration of the ICL into double-junction and multijunction perovskite LEDs.
Main Results:
- Achieved a peak external quantum efficiency (EQE) of 42.6% in double-junction perovskite LEDs.
- Demonstrated a maximum radiance of 690 W sr-1 m-2 with low driving voltage.
- Realized multijunction devices with sub-bandgap turn-on voltages and EQEs exceeding 60%.
Conclusions:
- The developed ICL enables low-barrier transport and solvent-tolerant stacking, reducing losses in series-stacked perovskite emitters.
- This strategy is compatible with multiple perovskite emitters and scalable for multijunction integration.
- Provides a practical route toward high-brightness and multi-wavelength perovskite light sources.
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