Advancements in metal-dielectric multilayer structures: tailoring for enhanced optoelectronic performance

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Chinese explanation / 中文解读

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Original abstract

Dielectric/metal/dielectric (D/M/D) multilayer transparent conductive structures have emerged as promising alternatives to conventional transparent conducting oxides (TCOs) for next-generation optoelectronic applications owing to their ability to simultaneously achieve high optical transparency and low electrical resistance through rational multilayer engineering. Unlike single-component transparent electrodes, D/M/D architectures exploit the synergistic interplay between ultrathin metallic interlayers and dielectric coatings to optimize the charge transport, optical interference, and interfacial stability of the electrode. Recent advances in thickness optimization, interface engineering, defect modulation, and plasmonic design have significantly expanded their applicability in photovoltaics, flexible electronics, photodetectors, transparent heaters, optical coatings, and wearable optoelectronic systems. This review presents a critical and comprehensive assessment of representative multilayer systems, including ZnO/Ag/ZnO, AZO/Ag/AZO, ITO/Ag/ITO, TiO 2 /Ag/TiO 2 , Nb 2 O 5 /Ag/Nb 2 O 5 , Ta 2 O 5 /Ag/Ta 2 O 5 , and emerging oxide/metal hybrid architectures. Comparative analysis reveals that Ag-based multilayers currently offer the most favourable balance between optical transmittance (>90%) and sheet resistance (<5 Ω/sq), although long-term stability, oxidation resistance, and material cost remain significant limitations of this technology. This review systematically examines fabrication approaches, including magnetron sputtering, sol–gel processing, PECVD, and ion-beam-assisted modification, emphasizing their influence on interfacial quality, scalability, and performance reproducibility. Advanced characterization methodologies, such as X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscopy, Hall measurements, Raman spectroscopy, and UV–visible analysis, are critically discussed to establish structure–property–performance correlations in the multilayer systems. Defect engineering, interfacial electronic modification, and optical bandgap tuning are effective methods for enhancing the performance of these Advanced Materials. Beyond laboratory-scale demonstrations, this review evaluates the industrial translation challenges, including the manufacturing cost, production yield, thickness uniformity, and roll-to-roll compatibility of these devices. Emerging opportunities involving flexible transparent electrodes, tandem photovoltaic architectures, plasmonic photonics, and multifunctional smart coatings are also discussed. Overall, this study provides a critical perspective on the current maturity of D/M/D multilayer technologies and identifies key research priorities, including alternative low-cost metallic interlayers, scalable deposition strategies, and interface stabilization approaches, which are necessary for the practical commercialization of high-performance transparent optoelectronic devices.

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