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Nanocrystal-Nucleus Template Strategy for Efficient Wide-Bandgap Perovskite Solar Cells with Enhanced Homogeneity and
Ziying Li1, Zejun Wei1, Xiangyu Sun1
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100871, China.
Advanced Materials (Deerfield Beach, Fla.)
|July 3, 2025
Summary
A new nanocrystal-nucleus template strategy solves halide segregation in wide-bandgap perovskite solar cells (PSCs). This breakthrough enhances performance and stability, achieving record efficiencies for PSCs and perovskite/silicon tandem devices.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Wide-bandgap perovskite solar cells (WBG PSCs) are key for high-efficiency tandem cells.
- However, WBG PSCs face challenges like photovoltage deficits and halide segregation, limiting performance and stability.
Purpose of the Study:
- To address heterogeneous nucleation and phase separation in WBG PSCs.
- To improve halide uniformity, crystallization control, and charge extraction in WBG perovskite films.
Main Methods:
- Developed a nanocrystal-nucleus template (NCNT) strategy with precise I/Br ratio matching.
- Guided homogeneous assembly of Pb-I/Br octahedra for uniform halide distribution.
- Simultaneously induced p-type doping and reduced interfacial energy barriers.
Main Results:
- Achieved exceptional halide uniformity and crystallization control in WBG films.
- WBG PSCs (1.68 eV) reached a record open-circuit voltage (VOC) of 1.30 V and 23.4% efficiency.
- Demonstrated broad applicability across 1.63-1.76 eV bandgaps with excellent photostability.
- WBG PSCs integrated into tandem cells achieved 32.0% efficiency (certified 31.7%).
Conclusions:
- The NCNT strategy effectively regulates perovskite crystallization by leveraging nanocrystals.
- Resolved long-standing VOC limitations in WBG perovskites.
- Established a scalable platform for advanced optoelectronic devices and tandem photovoltaics.
