A leaf-inspired photon management scheme using optically tuned bilayer nanoparticles for ultra-thin and highly efficient photovoltaic devices

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

25 Scopus Citations
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Author(s)

  • Sonali Das
  • Mohammad Jobayer Hossain
  • Siu-Fung Leung
  • Anya Lenox
  • Yeonwoong Jung
  • Kristopher Davis
  • Tania Roy

Detail(s)

Original languageEnglish
Pages (from-to)47-56
Journal / PublicationNano Energy
Volume58
Early online date24 Dec 2018
Publication statusPublished - Apr 2019
Externally publishedYes

Abstract

We present a leaf-inspired biomimetic omnidirectional photon management scheme for ultrathin flexible graphene silicon Schottky junction solar cell. An all-dielectric approach comprising lossless spheroidal silica and titania nanoparticle bilayers is used for mimicking the two essential light trapping mechanisms of a leaf - focusing and waveguiding, and scattering. The ratio of the nanoparticle diameters of the two optically tuned layers plays a crucial role in confining the incident light through whispering gallery modes and subsequent forward scattering into the substrate via strong leaky channels. The scheme does not employ any nanostructuring of the silicon substrate, thereby preventing the optical gain from being offset by recombination losses, completely decoupling the optical and electrical performances of the device. The light-trapping scheme shows ultralow broadband reflection of only 10.3% and causes a 30% increase in efficiency compared to a bare graphene/silicon solar cell. An efficiency of ~9% is obtained for solar cell with 20 µm thick n-silicon absorber and doped bilayer graphene, resulting in highest (1.89) watt/gram utilization of silicon among all graphene/silicon solar cells. The light-trapping nanoparticle-embellished solar cell retains its characteristics for >103 bending cycles for a bend radius as low as 3 mm, demonstrating its flexibility, durability and reliability.

Research Area(s)

  • All dielectric, Graphene Si Schottky junction solar cell, Hierarchical, Leaf inspired, Whispering gallery resonator

Citation Format(s)

A leaf-inspired photon management scheme using optically tuned bilayer nanoparticles for ultra-thin and highly efficient photovoltaic devices. / Das, Sonali; Hossain, Mohammad Jobayer; Leung, Siu-Fung; Lenox, Anya; Jung, Yeonwoong; Davis, Kristopher; He, Jr-Hau; Roy, Tania.

In: Nano Energy, Vol. 58, 04.2019, p. 47-56.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review