Efficient light trapping structures for organic photovoltaics fabricated by nanoimprint lithography

Shigeru Kubota, Kenta Hiraga, Kensaku Kanomata, Bashir Ahmmad, Jun Mizuno, Fumihiko Hirose

Research output: Contribution to journalArticle

Abstract

To improve the efficiency of organic photovoltaics (OPVs), the trapping of incident light with surface nanostructures, such as moth eye structures, is a highly useful strategy for enhancing absorption in the photoactive layer. Nanoimprint lithography is a widely used technique to produce large-area nanostructures cost effectively. However, the moth eye texture fabricated by the nanoimprint process necessarily contains a spatial clearance between adjacent cones, which could degrade the antireflective property of the textured surface. In this study, we perform optical simulations for the OPVs with moth eye coating to explore the effects of the spatial clearance in the moth eye array as well as its geometric pattern on the photocurrent generation. We show that the photocurrent level decreases significantly and superlinearly with increases in the size of the spatial clearance in moth eye, suggesting the importance of sufficiently narrowing the clearance size. Furthermore, we experimentally measure the performance of the OPV cell incorporated with the moth eye structure having a near-optimal geometric pattern with reduced clearance size to verify the simulation results.

Original languageEnglish
Pages (from-to)103-109
Number of pages7
JournalJournal of Photopolymer Science and Technology
Volume33
Issue number1
DOIs
Publication statusPublished - 2020

Keywords

  • FDTD
  • Light trapping
  • Nanoimprint lithography
  • Organic solar cell

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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