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Updated: May 13, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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Published on: September 8, 2017

Controlled Nucleation and Targeted Interface Modification in Wide-Bandgap Perovskite Solar Cells Based on

Yi-Peng Zhou¹, Liang-Xu Wang¹, Sheng-Chao Hui¹

¹Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an 710072, P. R. China.

|April 15, 2025

Summary

This study introduces a method to create high-quality, uniform wide-bandgap perovskite films for solar cells. By optimizing nanocrystal formation and using specific additives, researchers improved film quality and device efficiency.

Keywords:

crystallization kinetics evaporation-assisted two-step deposition interface modification nucleation sites surface dipole wide-bandgap perovskite solar cells

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Last Updated: May 13, 2025

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Published on: September 8, 2017

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Area of Science:

Materials Science
Renewable Energy
Nanotechnology

Background:

Solution deposition of wide-bandgap (WBG) perovskite films on textured silicon subcells faces challenges in uniformity and conformality, impacting perovskite/silicon tandem solar cell performance.
Evaporation-assisted deposition improves conformality but can lead to poor crystallinity and high defect density in WBG perovskite films.

Purpose of the Study:

To elucidate the formation mechanism of CsPbI$_{2}$Br$_{3-x}$ nanocrystals for enhanced perovskite film growth.
To improve perovskite film quality and uniformity using optimized evaporation and additives.
To enhance carrier transport and extraction at interfaces for higher solar cell efficiency.

Main Methods:

Investigated the formation mechanism of CsPbI$_{2}$Br$_{3-x}$ nanocrystals during thermal evaporation of PbI$_{2}$/CsBr templates.
Optimized evaporation conditions and incorporated 2,3,4,5,6-pentafluorobenzylphosphonic acid (pFBPA) during spin-coating.
Modified interfaces with pFBPA and ethane-1,2-diammonium iodide to induce surface dipoles and improve band alignment.

Main Results:

Achieved enhanced crystallization kinetics and improved perovskite film uniformity.
Demonstrated targeted surface dipoles at carrier transport layers/perovskite interfaces for better band alignment and passivation.
Enabled a WBG perovskite solar cell (1.68 eV) to achieve high power conversion efficiency (PCE) through improved electron extraction.

Conclusions:

Developed a method for fabricating high-quality, conformal WBG perovskite films via optimized nanocrystal formation and interface engineering.
Provided fundamental insights into achieving uniform WBG perovskite films, crucial for efficient perovskite/silicon tandem solar cells.
Established a theoretical foundation for advancing the development of high-performance perovskite/silicon tandem solar cells.