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Suppressing Phase Segregation and Improving Stability in Mixed-Halide Perovskites through Spinel Oxide-Directed
Diana K LaFollette1, Martin Gomez-Dominguez1, Kunal Datta1
1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
Journal of the American Chemical Society
|June 15, 2026
Summary
Spinel oxide substrates enable stable, phase-pure perovskite films for photovoltaics by reducing defects and preventing degradation. This lattice-matching strategy enhances perovskite stability and opens new avenues for optoelectronic devices.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Photovoltaics
Background:
- Mixed-cation mixed-halide perovskites are crucial for high-efficiency multijunction solar cells.
- Their application is limited by instability due to defects, phase segregation, and degradation.
Purpose of the Study:
- To introduce spinel oxides as novel lattice-matched substrates for perovskite film growth.
- To investigate the mechanisms by which spinel oxides improve perovskite film quality and stability.
Main Methods:
- Solution-processed perovskite film growth on spinel oxide substrates.
- Characterization using grazing incidence X-ray diffraction (GIXRD), X-ray fluorescence (XRF), cathodoluminescence-scanning electron microscopy (CL-SEM), cryogenic photoluminescence (cPL), and density functional theory (DFT).
- In situ grazing incidence wide-angle X-ray scattering (GIWAXS) for monitoring stability under humidity.
Main Results:
- Spinel oxides facilitate the growth of crystalline, phase-pure, and compositionally uniform bromide-rich perovskite films.
- Lattice mismatch-dependent compressive strain from Mg-halide bonds at the interface suppresses halide segregation and reduces defects.
- Perovskite films on spinel oxides retained >87% phase integrity after 12h under 100% relative humidity, compared to <70% for controls.
Conclusions:
- Spinel oxides offer a broadly applicable strategy for defect suppression, phase homogenization, and enhanced long-term stability in solution-processed halide perovskites.
- This work extends lattice matching principles to perovskite materials, paving the way for improved perovskite solar cells and optoelectronic devices.
