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Enhanced Broadband Absorption in Nanowire Arrays with Integrated Bragg Reflectors
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab. (Nanovetenskap)
Lund University, Lund, Sweden.
2017 (English)In: Nanophotonics, ISSN 2192-8614Article in journal (Refereed) Accepted
Abstract [en]

A near-unity unselective absorption spectrum is desirable for high-performance photovoltaics. Nanowire arrays are promising candidates for efficient solar cells due to nanophotonic absorption resonances in the solar spectrum. The absorption spectra, however, display undesired dips between the resonance peaks. To achieve improved unselective broadband absorption, we propose to enclose distributed Bragg reflectors (DBRs) in the bottom and top parts of indium phosphide (InP) nanowires, respectively. We theoretically show that by enclosing only two periods of In0.56Ga0.44As/InPDBRs, an unselective 78% absorption efficiency (72% for nanowires without DBRs)is obtained at normal incidence in the spectral range from 300 nm to 920 nm. Under oblique light incidence, the absorption efficiency is enhanced up to about 85% at an incidence angle of 50º. By increasing the number of DBR periods from two to five, the absorption efficiency is further enhanced up to 95% at normal incidence. In this work we calculated optical spectra for InP nanowires, but the results are expected to be valid for other direct band gap III-V semiconductor materials. We believe that our proposed idea of integrating DBRs in nanowires offers great potential for high-performance photovoltaic applications.

Place, publisher, year, edition, pages
Berlin: De Gruyter Open, 2017.
Keyword [en]
light trapping, distributed Bragg reflectors (DBRs), nanowires, photovoltaics
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:hh:diva-35885OAI: oai:DiVA.org:hh-35885DiVA: diva2:1166437
Available from: 2017-12-14 Created: 2017-12-14 Last updated: 2017-12-18

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Pettersson, Håkan

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