Abstract
Recently, solution-processed hybrid halide perovskite has emerged as promising materials for advanced optoelectronic devices such as photovoltaics, photodetectors, light emitting diodes and lasers. In the mean time, all-dielectric metasurfaces with high-index materials have attracted attention due to their low-loss and high-efficient optical resonances. Because of its tunable by composition band gap in the visible frequencies, organolead halide perovskite could serve as a powerful platform for realizing high-index, low-loss metasurfaces. However, direct patterning of perovskite by lithography-based technique is not feasible due to material instability under moisture. Here we report novel organolead halide perovskite metasurfaces created by the cost-effective thermal nanoimprint technology. The nanoimprinted perovskite metasurface showed improved surface morphology and enhanced optical absorption properties. Significantly enhanced optical emission with an eight-fold enhancement in photoluminescence (PL) intensity was observed under room temperature. Temperature-dependent PL of perovskite nanograting metasurface was also investigated. Based on our results, we believe that thermal nanoimprint is a simple and cost-effective technique to fabricate perovskite-based metasurfaces, which could have broad impact on optoelectronic and photonic applications.
Highlights
Metasurfaces allow modulation of electromagnetic properties of natural materials to achieve special optical functionalities by sub-wavelength structure engineering [1]
The computer modeling based pre-designed silicon (Si) nanograting mold was fabricated by electron-beam lithography (EBL) with hydrogen silsesquioxane (HSQ) resist, followed by plasma etching for pattern transfer
Summary and conclusions In summary, hybrid organohalide perovskite metasurfaces have been formed by thermal nanoimprint
Summary
Metasurfaces allow modulation of electromagnetic properties of natural materials to achieve special optical functionalities by sub-wavelength structure engineering [1] Realization of such artificial planar surfaces are based on noble plasmonic metals, which suffer from high energy dissipation due to ohmic losses, and, as a consequence, compromised device efficiency [2]. Perovskite-based solar cells technology demonstrated remarkable advancement, with power conversion efficiency increased rapidly from 3.8% in 2009 [9] to 23.6% in early 2017 [10] Such materials offer advantages of strong optical absorption [17], long carrier diffusion length [18], high carrier mobility [19], and broad wavelength tenability [15]. We demonstrate strong modification of perovskite optical absorption and emission properties, which is useful for studying perovskite-based metadevices such as high-efficient lightemitting diodes and lasers
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