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Updated: Jun 13, 2025
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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
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2D Phase Formation on 3D Perovskite: Insights from Molecular Stiffness
Lucas Scalon1, Charles Alves Nogueira2, André Felipe Vale Fonseca1
1Institute of Chemistry, University of Campinas (UNICAMP), 13083-970 Campinas, São Paulo, Brazil.
ACS Applied Materials & Interfaces
|September 13, 2024
Summary
The 2D perovskite phase forms on grain boundaries of 3D perovskite films, influenced by organic cation properties. This improves perovskite solar cell efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Low-dimensional (2D) structures enhance perovskite solar cell (PSC) efficiency and stability.
- Understanding the formation of 2D phases on 3D perovskite films is crucial for optimizing PSCs.
Purpose of the Study:
- To identify the formation sites of the 2D phase on 3D perovskite films.
- To correlate organic cation properties (molecular stiffness, steric hindrance) with 2D/3D perovskite formation and crystallization.
- To investigate the impact of 2D/3D perovskite heterointerfaces on solar cell performance.
Main Methods:
- Cathodoluminescence (CL) combined with scanning electron microscopy (SEM) to locate 2D phase formation.
- In situ grazing-incidence wide-angle X-ray scattering (GIWAXS) to monitor 2D/3D perovskite formation and crystallization.
- Fabrication and characterization of 2D/3D perovskite heterointerface solar cells.
Main Results:
- The 2D perovskite phase preferentially forms on the grain boundaries of the 3D perovskite.
- 2D phase formation and crystallization are dependent on the steric hindrance and molecular stiffness of organic cations.
- Solar cells with 2D/3D perovskite heterointerfaces achieved a maximum power conversion efficiency of 21.5%, especially with flexible cations.
Conclusions:
- Grain boundary formation of the 2D phase explains passivation mechanisms in 3D perovskite films.
- Organic cation design, specifically stiffness and steric hindrance, is key for controlling 2D perovskite formation and crystallization.
- Tailoring the 2D/3D perovskite interface through cation engineering offers a promising route for high-efficiency perovskite solar cells.
Keywords:
2D/3D perovskitesSEM-cathodoluminescencein situ GIWAXSlow-dimensional perovskitesperovskite solar cellsMore Related Videos
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