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Low temperature growth (001) facet-oriented p-type FAPbI3 perovskite solar cells
Jing Chen1, Cuina Gao1, Junlei Tao1
1College of Science, Hebei University of Science and Technology, 26 Yuxiang Road, Shijiazhuang 050018, P. R. China.
Chemical Communications (Cambridge, England)
|July 1, 2025
Summary
This study enhances formamidinium lead iodide (FAPbI3) perovskite solar cells by promoting (001) crystal facets using 2D passivation. This improves carrier extraction and device stability, achieving a 23.02% power conversion efficiency.
Area of Science:
- Materials Science
- Solid-State Physics
- Photovoltaics
Background:
- Perovskite crystal facets critically impact photoelectric properties and device performance.
- Undesired crystal facets in formamidinium lead iodide (FAPbI3) hinder carrier extraction and stability.
- Controlling crystallographic orientation is key for efficient perovskite solar cells.
Purpose of the Study:
- To promote desired (001) crystal facet orientation in FAPbI3 perovskites.
- To investigate the effect of controlled facet orientation on conductivity and carrier transport.
- To enhance the power conversion efficiency and stability of FAPbI3-based solar devices.
Main Methods:
- Utilizing 2D PEA2FA(n-1)Pb(n)I(3n+1) for preferential growth of (001) FAPbI3 facets.
- Employing X-ray diffraction to confirm crystallographic orientation.
- Conducting density functional theory (DFT) calculations to analyze carrier transport.
- Fabricating and characterizing perovskite solar devices.
Main Results:
- Achieved highly preferred (001) FAPbI3 orientation, suppressing other facets.
- Observed a transition from n-type to p-type conductivity in FAPbI3.
- DFT revealed superior hole transport properties on the (001) facet.
- Demonstrated a power conversion efficiency of 23.02% with a 1.19 V open-circuit voltage.
Conclusions:
- 2D passivation effectively controls FAPbI3 crystallographic orientation, enhancing device performance.
- Optimized (001) facet orientation and p-type conductivity are crucial for efficient carrier extraction.
- This approach offers a pathway to highly efficient and stable perovskite solar cells.
