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Dimova-Malinovska D.,Central Laboratory Of Solar Energy And New Energy Sourcesbulgarian Academy Of Sciencesbulv Tzarigradsko Chaussee | Lovchinov K.,Central Laboratory Of Solar Energy And New Energy Sourcesbulgarian Academy Of Sciencesbulv Tzarigradsko Chaussee | Petrov M.,Central Laboratory Of Solar Energy And New Energy Sourcesbulgarian Academy Of Sciencesbulv Tzarigradsko Chaussee | Karashanova D.,Institute Of Optical Materials And Technologiesbulgarian Academy Of Science Academy G Bonchev Str | Angelov O.,Central Laboratory Of Solar Energy And New Energy Sourcesbulgarian Academy Of Sciencesbulv Tzarigradsko Chaussee
Physica Status Solidi (A) Applications and Materials Science | Year: 2014

Structural, optical, and electrical properties of multilayer stacks ZnO:Al/Ag/ZnO:Al and ZrO2/Ag/ZrO2 are studied. The stacks are deposited on glass substrates without heating by consecutive r.f. magnetron sputtering of ZnO:Al and Ag or ZrO2 and Ag targets, respectively. The properties of samples as-deposited and annealed in forming gas atmosphere, at 180°C for 1h are compared. The structural properties of the stacks are studied by TEM and SEM images and demonstrate semicontinuous granular structure of the Ag films. The Ag nanograins in ZrO2-based stacks have a larger size than in the ZnO-based stacks. The spectra of transmittance and reflectance have bands resulting from interband transitions of d-shell electrons of Ag atoms and plasma resonance oscillations of free electrons. The sheet resistance of the as-deposited and annealed stacks is in the range 3.1-8.9Ω/□ and change slightly after annealing. The deposited stacks have potential for application as a back reflector in thin-film solar cells for improvement of light harvesting and their efficiency. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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