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Highly Reflective Dielectric Back Reflector for Improved Efficiency of Tandem Thin-Film Solar Cells

Barugkin, Chog; Paetzold, Ulrich W. ORCID iD icon 1; Catchpole, Kylie R.; Basch, Angelika; Carius, Reinhard
1 Karlsruher Institut für Technologie (KIT)


We report on the prototyping and development of a highly reflective dielectric back reflector for application in thin-film solar cells. The back reflector is fabricated by Snow Globe Coating (SGC), an innovative, simple, and cheap process to deposit a uniform layer of TiO$_{2}$ particles which shows remarkably high reflectance over a broad spectrum (average reflectance of 99% from 500 nm to 1100 nm). We apply the highly reflective back reflector to tandem thin-film silicon solar cells and compare its performance with conventional ZnO:Al/Ag reflector. By using SGC back reflector, an enhancement of 0.5 mA/cm$^{2}$ in external quantum efficiency of the bottom solar cell and an absolute value of 0.2% enhancement in overall power conversion efficiency are achieved. We also show that the increase in power conversion efficiency is due to the reduction of parasitic absorption at the back contact; that is, the use of the dielectric reflector avoids plasmonic losses at the reference ZnO:Al/Ag back reflector. The Snow Globe Coating process is compatible with other types of solar cells such as crystalline silicon, III–V, and organic photovoltaics. ... mehr

Volltext §
DOI: 10.5445/IR/1000061633
DOI: 10.1155/2016/7390974
Zitationen: 8
Web of Science
Zitationen: 8
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1110-662X, 1687-529X
KITopen-ID: 1000061633
HGF-Programm 43.23.04 (POF III, LK 01) Nanophotonics for Energy Conversion
Erschienen in International journal of photoenergy
Verlag Hindawi
Band 2016
Seiten Art. Nr.: 7390974
Nachgewiesen in Dimensions
Web of Science
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