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Improving the long-term stability of new-generation perovskite-based TCOs using binary and ternary oxides capping
Moussa Mezhoud1, Martando Rath1, Stéphanie Gascoin1
1Université de Caen Normandie, ENSICAEN, CNRS UMR 6508, CRISMAT, Normandie Univ., 14000 Caen, France. moussa.mezhoud@ensicaen.fr.
Nanoscale
|June 10, 2025
Summary
Amorphous lanthanum aluminum oxide (LaAlO3) capping layers significantly enhance the thermal stability of strontium vanadate (SrVO3) transparent conductive oxides. This method preserves electrical conductivity and optical properties, crucial for advanced oxide electronics.
Area of Science:
- Materials Science
- Solid State Physics
- Thin Film Technology
Background:
- Transparent conductive oxides (TCOs) are essential for electronic devices.
- Vanadate-based TCOs, like strontium vanadate (SVO), offer unique properties but suffer from poor thermal stability.
- Improving the longevity of TCOs under thermal stress is critical for practical applications.
Purpose of the Study:
- To investigate the effectiveness of various capping layers in enhancing the thermal stability of SrVO3 TCOs.
- To minimize the loss of electrical conductivity and preserve optical properties during heat treatment.
- To identify the optimal capping material for long-term stability of correlated TCOs.
Main Methods:
- In situ deposition of amorphous Al2O3, amorphous LaAlO3 (LAO), and TiO2 capping layers on SrVO3 thin films.
- Utilizing Pulsed Laser Deposition (PLD) for thin film growth.
- Evaluating the impact of capping layers on electrical conductivity and optical properties after heat treatment in an ambient environment.
Main Results:
- Amorphous LaAlO3 demonstrated superior performance as a capping layer compared to Al2O3 and TiO2.
- LaAlO3 effectively preserved both the electrical and optical characteristics of SrVO3 films against natural and artificial aging.
- The capping layer approach successfully mitigated degradation during thermal treatment.
Conclusions:
- Amorphous LaAlO3 is a highly promising capping material for stabilizing vanadate-based TCOs.
- This strategy addresses the long-term stability challenges of correlated TCOs.
- The findings open new avenues for the application of stable oxide electronics.
