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Broadband EMI Shielding Performance in Optically Transparent Flexible In2O3/Ag/In2O3 Thin Film Structures
Anton S Voronin1,2,3, Sergey V Nedelin4,5, Nikita A Zolotovsky4,5
1Regional Educational and Scientific Center "Security", Bauman Moscow State Technical University, 105005 Moscow, Russia.
Materials (Basel, Switzerland)
|December 11, 2025
Summary
Flexible In2O3/Ag/In2O3 thin films offer transparent electromagnetic interference (EMI) shielding. These films provide high optical transparency and conductivity for advanced electronics and telecommunications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Electrical Engineering
Background:
- Flexible electronics and 5G/6G devices require materials with combined transparency, conductivity, and electromagnetic interference (EMI) shielding.
- Achieving high optical transparency, low sheet resistance, and effective broadband shielding simultaneously is challenging.
Purpose of the Study:
- To synthesize and characterize flexible Indium Oxide/Silver/Indium Oxide (IAI) structures for transparent EMI shielding applications.
- To optimize the IAI structure for enhanced optical, electrical, and shielding properties.
Main Methods:
- Synthesis of flexible IAI thin films on polyethylene terephthalate substrates.
- Comprehensive characterization of optical transmittance, sheet resistance, optical haze, and broadband EMI shielding (10 MHz to 1 THz).
- Evaluation of mechanical resilience under repeated bending.
Main Results:
- Optimized IAI structure (13.2 ± 1.1 nm Ag interlayer) achieved 82.59% optical transmittance at 500 nm and low sheet resistance of 6.4 ± 0.8 Ω/sq.
- Insignificant optical haze (1.04%) and uniform broadband EMI shielding of 25-30 dB from radiowave to terahertz frequencies.
- Demonstrated outstanding mechanical resilience, maintaining performance after repeated bending.
Conclusions:
- Flexible IAI thin films present a promising solution for transparent EMI shielding.
- The unique combination of optical, electrical, mechanical, and shielding properties makes IAI suitable for advanced telecommunications and flexible optoelectronics.
