Inhaltspezifische Aktionen

Oktober

Bild des Monats Oktober 2018

Hier finden Sie wechselnde Einblicke in die Arbeiten der am LaMa beteiligten Arbeitsgruppen. Eine Sammlung aller bisher erschienenen Bilder finden sie in der Galerie der Bilder des Monats.

Microstructuring of VO2 for improved transmittance properties

Vanadiumdioxide (VO2) is a material which changes its transmittance properties due to a temperature induced phase metal-insulator transition (MIT). The transmittance for infrared light in the monoclinic low temperature phase is much higher then in the tetragonal high temperature phase, thus VO2 is predestined for use as a smart window coating for an improved climate control in buildings.
To gain a better optical impression and a higher transmittance in the visible range, one attempts to reduce the VO2 covered area (AC) by microstructuring but on the other hand to maintain the switching effect.
Firstly, the VO2 thin films were deposited by radio frequency sputtering (RF sputtering), then photolithography was carried out in the MiNaLab. As last step ion beam etching (IBE) was used for structuring the samples to obtain different patterns in the VO2 thin film.
Producing different types of structures and using various etching parameters will be the next steps to gain the best relation between enhancing the transmittance in visible light and still a good switching efficiency for the MIT in the infrared range.

Dieses Bild wurde eingereicht von Hannes Giese, Arbeitsgruppe PD Dr. Angelika Polity.