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DOI: 10.1021/acsphotonics.7b01153
Zitationen: 1
Web of Science
Zitationen: 1

Texture of the Viola Flower for Light Harvesting in Photovoltaics

Schmager, Raphael; Fritz, Benjamin; Hünig, Ruben; Ding, Kaining; Lemmer, Uli; Richards, Bryce Sydney; Gomard, Guillaume; Paetzold, Ulrich Wilhelm

Nature’s evolution provides a multitude of answers to scientific and key technological challenges such as the light harvesting. In this work, we investigate the optical properties of the unique texture of viola petals for the purpose of improved light harvesting in photovoltaics. We find that crystalline silicon solar cells encapsulated with a transparent coating show a 6% improvement in power conversion efficiency if the viola petal texture is replicated onto the front surface. This gain is based on a broadband enhancement in current generation which originates from the exceptional optical properties of the viola surface texture, combining micro/ and nano/texture. The micro/cones of this hierarchical texture demonstrate strong and broadband light in coupling effects as well as retro/reflection capabilities, and the nano/wrinkles further decrease the reflection losses. Using rigorous optical simulation, we analyze and explain the working principle ruling the light harvesting properties of this dual/scale texture.

Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 2330-4022
KITopen ID: 1000075733
HGF-Programm 43.23.04; LK 01
Erschienen in ACS photonics
Seiten 2687-2692
Schlagworte photovoltaics, solar cells, light management, biomimetics, retro-reflection
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