Broadband Enhancement of Anti-reflectivity for a High Angle of Incidence Using Nanocone Geometry

Seungmuk Ji, Young Shik Yun, Jihye Lee, Deok Jin Jeon, Namsu Kim, Hyuneui Lim, Jong Souk Yeo

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The broadband antireflective (AR) effect for wide incident angles has a significant effect on the photoconversion efficiency of photovoltaics and visibility of large-format display panels. The fabrication of surface nanostructures has continued to attract research interest as an effective way to provide such optical performance. However, the effects of different nanostructure geometries are not fully understood, especially for wide-angle AR effects. In this work, we conduct a systematic analysis of the effect of periodic nanostructures such as nanocones (NCs) and inverted nanocones (INCs) on anti-reflectivity at high angles of incidence (AOIs) in terms of light scattering, guided-mode resonance (GMR), and internal reflections. NCs provide good coupling of light scattering and GMR because of their protruding geometry; hence, reduced reflectance can be obtained in the short wavelength region. Further, NCs exhibit relatively weaker GMR intensities and internal reflections, resulting in low reflectance in the long wavelength region. Therefore, NCs offer a superior broadband AR effect for high AOIs compared with INCs. Based on this analysis, we demonstrate an extremely low average reflectance (5.4%) compared to that of the bare substrate (34.7%) for the entire visible range at an AOI of 75° by fabricating NCs on both sides of the substrate.

Original languageEnglish
Pages (from-to)18825-18834
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number16
Publication statusPublished - 2022 Apr 27

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All Science Journal Classification (ASJC) codes

  • General Materials Science


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