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Interfacial Rivet to Fill Structural Defects: A Spacer Engineering Gift for 3D Solar Cells.

Wei Jia1, Qiangqiang Zhao1,2, Yan Zhuang1

  • 1Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an, 710072, China.

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Summary
This summary is machine-generated.

Engineered 2D perovskites act as interface rivets to optimize 3D perovskite films, significantly boosting perovskite solar cell efficiency and stability by reducing defects and recombination.

Keywords:
(HA)2(MA)n−1PbnI3n+1 perovskites2D/3D perovskite solar cells2D/3D perovskitesgrain boundarieshigh‐quality thin‐film systems

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Nanotechnology

Background:

  • Perovskite solar cells (PSCs) show promise but are limited by defects at surfaces and interfaces.
  • Achieving high-quality perovskite films by combining 2D and 3D materials is challenging due to complex surface reactions.

Purpose of the Study:

  • To develop a method for precisely controlling 2D perovskite structures on 3D perovskite films.
  • To enhance the efficiency and stability of perovskite solar cells through interface engineering.

Main Methods:

  • Synthesized phase-pure 2D (HA)2(MA)n-1PbnI3n+1 perovskites with controlled layer numbers (n).
  • Utilized these 2D perovskites as interface rivets to optimize 3D perovskite films, tuning defects and grain boundaries.
  • Fabricated and characterized perovskite solar cells using the optimized film system.

Main Results:

  • Reduced non-radiative recombination, leading to improved optical performance, higher carrier mobility, and lower trap density.
  • Achieved a champion power conversion efficiency (PCE) over 25% with enhanced open-circuit voltage (VOC) and fill factor (FF).
  • Demonstrated large-area device uniformity and PCE over 21.24% on a 14 cm2 active area.

Conclusions:

  • The 2D perovskite interface rivet strategy effectively optimizes 3D perovskite films for high-performance solar cells.
  • This approach offers a new pathway for enhancing the efficiency and long-term stability of perovskite solar cells.
  • The scalable synthesis and application of 2D perovskites present a promising direction for next-generation photovoltaics.