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Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.58: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

Template-Assisted Fabrication of Spectrum-Programmable Superlattice Photonic Crystals for Efficient Solar Energy Harvesting — •Zhiqiang Zeng, Rui Xu, and Yong Lei — Institut für Physik & IMN MacroNano* (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany

Superlattice photonic crystals (SPhCs) possess tremendous potentials as building blocks for high-performance solar thermal conversion systems because of their great flexibility in optical manipulation. To be as solar absorbers, the key points are to fabricate highly-ordered SPhCs in large scale and to realize spectrally-programmable selective light absorption spectra for different operational temperatures. In this work, wafer-scale nickel (Ni) SPhCs with excellent structural uniformity are fabricated by structurally replicating nanoporous alumina templates comprising two sets of nanopores (NPs) and nanoconcaves (NCs). Both self-aligned sets of NPs and NCs are simultaneously formed during the anodization of surface-patterned aluminum foils. The Ni SPhCs demonstrate omnidirectional polarization-independent selective light absorption spectra whose cutoff wavelength can be precisely programmed in the spectral range of 600 to 1500 nm. Below the cutoff wavelength all absorption efficiencies are enhanced to over 90% due to surface plasmon resonance and cavity resonance stemming from both NCs and NPs. All these advantages in optics and fabrication qualify Ni SPhCs as excellent candidates of solar absorbers for practical utilization.

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