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Molecularly Confined Domains Enable Halide-Stable Wide-Bandgap Perovskites
Youming Zhu1,2, Biao Li1, Baochao Zheng2
1State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering, Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou, Zhejiang, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|June 12, 2026
Summary
Molecular confinement stabilizes wide-bandgap perovskites by preventing halide segregation. This breakthrough enhances perovskite solar cell efficiency and stability for advanced tandem photovoltaics.
Area of Science:
- Materials Science
- Photovoltaics
- Solid-State Chemistry
Background:
- Wide-bandgap (WBG) perovskites are crucial for high-efficiency tandem photovoltaics.
- Halide phase segregation in mixed-halide WBG perovskites limits device performance and stability.
Purpose of the Study:
- To suppress halide segregation in WBG perovskites using molecular confinement.
- To enhance the stability and performance of WBG perovskite films and devices.
Main Methods:
- Designing organic ligands to bind FA+ cations and form a molecular confinement domain.
- Utilizing bifunctional diammonium linkers to interconnect ligands.
- Investigating the effects of molecular confinement on cation dynamics, Pb-X bond strength, lattice rigidity, and ion migration.
Main Results:
- Molecular confinement effectively suppressed I-Br mixed-halide segregation and defect evolution.
- WBG perovskite films exhibited reduced trap densities, improved carrier transport, and enhanced light/thermal stability.
- Single-junction cells achieved efficiencies of 24.21% (1.68 eV) and 21.20% (1.78 eV).
- Silicon-based tandem cells reached a certified efficiency of 33.59% with T96 lifetime of 1000 hours.
Conclusions:
- Molecular confinement is a viable strategy to stabilize mixed-halide WBG perovskites.
- This approach significantly improves the performance and long-term stability of perovskite solar cells and tandem devices.
- The findings pave the way for next-generation, highly efficient, and stable perovskite-based photovoltaics.
