Park, Yongkook Ahn, Hyoseong Lee, Kyu-Tae Kim, Ji-hyun Nam, Minwoo Cho, Junhee Han, Joon Soo Kim, Sun-Kyung Ko, Doo-Hyun 2024-01-19T19:02:37Z 2024-01-19T19:02:37Z 2021-09-04 2019-10-04 0957-4484 https://pubs.kist.re.kr/handle/201004/119469 Silicon photonic structures have attracted a great deal of attention due to their potential benefits of efficient light management in optoelectronic applications. In this paper, we demonstrate broadband optical absorption enhancement in solution-processed amorphous silicon (a-Si) by leveraging the advantages of silicon photonic structures. Graded refractive index silicon multilayer structures are employed by modulating optical constants with simple process optimization, resulting in significantly improved reflectance over a broad range of visible wavelengths. In addition, nanopatterning flexibility of solution-processed silicon provides benefits for tailoring silicon optical properties. With the incorporation of the two-dimensional submicron pattern into silicon films, the absorptivity of silicon films improves considerably below the wavelength of the bandgap (lambda similar to 800 nm), and the limited bandwidth of absorptivity in silicon films can be extended to near-infrared wavelengths by coating with a thin gold layer. The methodology is generally applicable to a platform for improving the broadband optical absorption of photonic and optoelectronic devices. English IOP PUBLISHING LTD NANOIMPRINT LITHOGRAPHY LOW-TEMPERATURE SILICON All-solution-processed Si films with broadband and omnidirectional light absorption Article 10.1088/1361-6528/ab2d05 1 NANOTECHNOLOGY, v.30, no.40 NANOTECHNOLOGY 30 40 scie scopus 000476531600002 2-s2.0-85071689926 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article NANOIMPRINT LITHOGRAPHY LOW-TEMPERATURE SILICON solution processing amorphous silicon graded refractive index antireflection layers nanoimprint lithography nanopatterned photonic structures