Publication date: 15th December 2025
We report on the formation of metal nanoislands (Au, Ag, Al, Ti) and their plasmonic influence on subsequently deposited perovskite absorber layers. Initially, ultrathin metal films were deposited on quartz substrates and thermally annealed at temperatures between 500 °C and 700 °C to induce controlled dewetting and generate size-tunable nanoislands. These plasmonic nanostructures served as the underlying metallic template onto which the perovskite layer was later deposited. Post-annealing at 100 °C for 1 hour enabled further evolution of the metal nanoisland morphology, with higher temperatures (>500 °C) producing a Gaussian particle size distribution centered around ~25 nm. Optical characterization revealed a pronounced localized surface plasmon resonance (LSPR) near 500 nm with a broad spectral shoulder and tail, indicative of the wide nanoparticle size spread. When integrated beneath a perovskite absorber in a planar device configuration, these metal nanoislands significantly enhanced optical absorption and photocurrent generation, yielding improvements of up to 35.51%, strongly dependent on nanoisland size and surface density. This study highlights the strong potential of metal–perovskite plasmonic coupling for boosting light harvesting in next-generation solar cells.
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