Modal analysis of resonant and non-resonant optical response in semiconductor nanowire arrays

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Dagytė, VilgailėLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH (author)

Modal analysis of resonant and non-resonant optical response in semiconductor nanowire arrays

Article/chapterEnglish2019

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2018-11-09
IOP Publishing,2019

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LIBRIS-ID:oai:lup.lub.lu.se:b2cc987c-6bbe-42bd-bce5-5a20b0b2e562
https://lup.lub.lu.se/record/b2cc987c-6bbe-42bd-bce5-5a20b0b2e562URI
https://doi.org/10.1088/1361-6528/aaea26DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype
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Nanowire array solar cells have reached efficiencies where it becomes feasible to talk about creating tandem solar cells in order to achieve even higher efficiencies. An example of such a tandem solar cell could be a nanowire array embedded in a membrane and integrated on top of a Si bottom cell. Such a system, however, requires understanding and control of its interaction with light, especially to make sure that the low energy photons are transmitted to the bottom cell. The dependence of the optical response of a nanowire array on the nanowire length, diameter, array pitch, materials surrounding the nanowires, and absorption coefficient of the nanowire material is very strong and possibly resonant, indicating the complexity of the optical response. In this work, we use an eigenmode-based analysis to reveal underlying physics that gives rise to observed resonant and non-resonant behavior. First, we show that an effective refractive index can be defined at long wavelengths, where only a single mode propagates. Second, we analyze the origin of the resonant reflection when the next optical mode becomes propagating and can be 'trapped' in the array and interact with the fundamental mode. Additionally, we define two simple boundaries for the wavelength range of the resonant response: the resonances can only occur if there is more than 1 propagating mode in the array, and they disappear if the 1st diffracted order is propagating in the top or bottom material. Such resonance effects could be detrimental for tandem solar cells. We thus provide recommendations for tuning the geometry of the array and the nanowire materials in order to push the resonant regime to the absorbing regime of the nanowire, where absorption in the nanowires dampens the resonances. Finally, this work demonstrates the strength of an eigenmode-based analysis of the optical response of periodic nanostructures in terms of simplifying the analysis of a complex system.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Nanoteknik Nanoteknik hsv//swe
ENGINEERING AND TECHNOLOGY Nano-technology Nano-technology hsv//eng
NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng

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Anttu, NicklasAalto University(Swepub:lu)ftf-naa (author)
NanoLund: Centre for NanoscienceAnnan verksamhet, LTH (creator_code:org_t)

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In:Nanotechnology: IOP Publishing30:20957-44841361-6528

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By the author/editor: Dagytė, Vilgailė; Anttu, Nicklas

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Energy Engineeri ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Nano technology; and Nano technology

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

Articles in the publication: Nanotechnology

By the university: Lund University

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