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Ge quantum dot lattices in alumina prepared by nitrogen assisted deposition: structure and photoelectric conversion efficiency

Tkalčević, Marija; Basioli, Lovro; Salamon, Krešimir; Šaric, Iva; Sancho-Parramon, Jordi; Bubaš, Matej; Bogdanović-Radović, Ivančica; Bernstorff, Sigrid; Fogarassy, Zsolt; Balazsi, Katalin; Petravić, Mladen; Mičetić, Maja (2020) Ge quantum dot lattices in alumina prepared by nitrogen assisted deposition: structure and photoelectric conversion efficiency. Solar energy materials and solar cells, 218 . ISSN 0927-0248

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Thin films comprising three-dimensional germanium (Ge) quantum dot lattices formed by nitrogen (N) assisted magnetron sputtering deposition in alumina (Al2O3) matrix have been studied for light-harvesting purposes. In order to expand the application of this material it is necessary to reduce germanium oxidation and to achieve stabilization of the germanium/alumina interface. Effects of tuning the N concentration, substrate temperature, and Ge sputtering power during the film preparation are monitored. It is shown that the N presence not only reduces Ge oxidation during annealing but also affects the internal structure, size and arrangement of Ge quantum dots. Additionally, the deposition temperature and Ge sputtering power are used to tune the Ge quantum dot size, separation and the regularity of their positions. It is shown that the optical and electrical properties of the films, especially their photo-induced current, and quantum efficiency are strongly tunable by the deposition conditions. Moreover, a significant photo-response and effect of multiple exciton generation effects is observed. The materials presented could be used as a sensitive layer for photodetectors or photovoltaic light-harvesting devices. The presented tools can be used for future fine-tuning of the material to achieve the optimal quantum efficiency.

Item Type: Article
Uncontrolled Keywords: Ge QDs ; quantum efficiency ; QD lattices ; N-assisted deposition ; spectral response ; multiple exciton generation
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Condensed Matter Physics
NATURAL SCIENCES > Chemistry > Physical Chemistry
Divisions: Division of Materials Physics
Project titleProject leaderProject codeProject type
Improvement of solar cells and modules through research and developmentKrunoslav JuraićKK. projekti Ministarstva znanosti, obrazovanja i športa
Depositing User: Marija Tkalčević
Date Deposited: 15 Nov 2021 14:03
DOI: 10.1016/j.solmat.2020.110722

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