High-performance multijunction perovskite LEDs with reduced interconnection loss.
basic_science · Level V
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- Record sourced from PubMed, PMID 42469249.
- Also identified by DOI 10.1038/s41467-026-75756-5.
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Abstract
Tandem light-emitting diodes (LEDs) offer advantages in efficiency, brightness and lower the current density for a target brightness, but their implementation in solution-processed perovskite LEDs is limited by interconnection strategies that introduce high voltage penalties and poor robustness. Here we demonstrate a hierarchically structured interconnection layer (ICL) integrating a near-degenerate charge-generation junction with a crystalline-amorphous oxide composite, enabling low-barrier transport and solvent-tolerant stacking with reduced loss. Using this ICL, we realize double-junction perovskite LEDs in which two subunits operate efficiently in series, achieving a peak external quantum efficiency (EQE) of 42.6%, a maximum radiance of 690 W sr<sup>-1</sup> m<sup>-2</sup>, and low driving voltage. The ICL is compatible with multiple perovskite emitters and supports scalable multijunction integration, yielding multijunction devices with sub-bandgap turn-on voltages and high EQEs exceeding 60%. Our results establish a low-loss interconnection strategy for series-stacked perovskite emitters, providing a practical route toward high-brightness and multi-wavelength perovskite light sources.