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CsPbBr3 Nanocrystals as Bottom Interface Nucleation Seeds for Printing Oriented FAPbI3 Thin Films: An In Situ Study
Altantulga Buyan-Arivjikh1, Jascha Fricker1, Thomas Baier1
1Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Straße 1, 85748, Garching, Germany.
Small (Weinheim an Der Bergstrasse, Germany)
|August 20, 2025
Summary
A novel CsPbBr3 nanocrystal seed layer guides perovskite film crystallization, accelerating phase transition and improving optoelectronic properties by reducing defects. This method enhances performance in lead halide perovskite devices.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Physics
Background:
- Lead halide perovskites exhibit excellent optoelectronic properties crucial for device applications.
- Uncontrolled crystallization during processing leads to defects, hindering device performance.
- Controlled, oriented crystallization in printed perovskite films is a significant challenge.
Purpose of the Study:
- To introduce and evaluate a CsPbBr3 nanocrystal seed layer strategy for controlled perovskite film crystallization.
- To investigate the mechanistic insights of seeding on film growth and optoelectronic quality.
- To improve the performance of optoelectronic devices based on FAPbI3 perovskites.
Main Methods:
- In situ grazing-incidence wide-angle X-ray scattering (GIWAXS) to track structural evolution.
- Transmission-mode UV-vis absorption and photoluminescence spectroscopy to monitor optical properties.
- Fabrication and characterization of FAPbI3 perovskite films with and without CsPbBr3 seed layers.
Main Results:
- The CsPbBr3 seed layer significantly accelerates the phase transition from the photoinactive δ-phase to the photoactive α-phase.
- Crystallization rate constant increased over six times in seeded films compared to unseeded films.
- Seeding governed crystallographic orientation, enhancing optical absorption and reducing defect density.
Conclusions:
- A CsPbBr3 nanocrystal seed layer effectively controls perovskite film crystallization and suppresses defects.
- This seeding strategy enhances the optoelectronic properties and device performance of lead halide perovskites.
- The findings offer a promising approach for scalable manufacturing of high-quality perovskite films.
