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Solid-liquid interface synthesis of selective (111)-oriented Cs2AgBiBr6 perovskite crystals
Enliu Hong1, Ziqing Li2, Ming Deng1
1College of Smart Materials and Future Energy, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, PR China.
Nature Communications
|February 23, 2026
Summary
Controlling crystal facet orientation is key for optoelectronic devices. This study uses microdroplet synthesis to achieve (111)-preferred Cs2AgBiBr6 crystals, enhancing device performance and stability.
Area of Science:
- Materials Science
- Crystallography
- Semiconductor Physics
Background:
- Controlling crystal facet orientation is vital for anisotropic material properties and optoelectronic device performance.
- Challenges exist in managing crystal growth kinetics and defect suppression during spontaneous crystallization.
Purpose of the Study:
- To report the microdroplet interface synthesis of Cs2AgBiBr6 single crystals with controlled crystallographic orientations.
- To investigate methods for achieving preferred facet orientation and improving crystal quality.
Main Methods:
- Microdroplet interface synthesis to control solid-liquid interface energy.
- Selective reduction of nucleation barriers for specific facets.
- Thermal annealing to enhance crystal quality.
- Theoretical calculations and experimental validation.
Main Results:
- Achieved selective (111)-preferred orientation of Cs2AgBiBr6 crystals by modulating interface energy.
- Demonstrated improved crystal quality via thermal annealing, reducing lattice strain and defects.
- (111)-oriented facets showed enhanced stability against moisture and light, with higher ionic migration energy and lower defect density compared to (100) and (110) facets.
- Photodetectors fabricated with (111) facets exhibited superior performance.
Conclusions:
- Interface energy modulation is crucial for directing crystallographic orientation.
- The (111)-preferred orientation strategy offers a pathway for designing high-performance optoelectronic materials.
- This work provides theoretical and practical strategies for precise crystal facet manipulation.
