Redox mediator-stabilized wide-bandgap perovskites for monolithic perovskite-organic tandem solar cells

Shengfan Wu, Yichao Yan, Jun Yin, Kui Jiang, Fengzhu Li, Zixin Zeng, Sai Wing Tsang, Alex K.Y. Jen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

Halide segregation critically limits the stability of mixed-halide perovskite solar cells under device operational conditions. There is a strong indication that halide oxidation is the primary driving force behind halide de-mixing. To alleviate this problem, we develop a series of multifunctional redox mediators based on anthraquinone that selectively reduce iodine and oxidize metallic Pb0, while simultaneously passivating defects through tailored cationic substitution. These effects enable wide-bandgap perovskite solar cells to achieve a power conversion efficiency of 19.58% and a high open-circuit voltage of 1.35 V for 1.81-eV PSCs. The device retains 95% of its initial efficiency after operating at its maximum power point for 500 h. Most notably, by integrating the perovskite device into the monolithic perovskite-organic tandem solar cell as a wide-bandgap subcell, we report an efficiency of 25.22% (certified 24.27%) with impressive long-term operational stability (T 90 > 500 h).

Original languageEnglish
JournalNature Energy
DOIs
Publication statusPublished - 26 Jan 2024

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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