Određivanje ultrabrze dinamike fotopobuđenih nosilaca naboja poluvodičkih tankih slojeva dihalkogenida i oksinitrida prijelaznih metala

master's thesis

• Title (english): Unraveling ultrafast dynamics of photoexcited charge carriers in semiconducting thin films of dichalcogenides and transition metal oxynitrides
• Author: Nikola Gredičak
• Mentor: Silvije Vdović (mentor)
• Mentor: Ivan Kokanović (komentor)
• Committee member: Ivan Kokanović (predsjednik povjerenstva)
• Committee member: Silvije Vdović (član povjerenstva)
• Committee member: Danko Radić (član povjerenstva)
• Committee member: Damir Pajić (član povjerenstva)
• Committee member: Damjan Pelc (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2024-08-26, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

Glavni cilj rada bio je istražiti fotofizička svojstva različitih poluvodičkih tankih slojeva dihalogenida i oksinitrita prijelaznih metala te na temelju tih svojstava razviti model dinamike nosioca naboja i procijeniti potencijal njihove primjene u industriji. Poluvodiči prijelaznih metala oksida i oksinitrita su bili sintetizirani uz pomoću tehnike magnetronskog rasprašenja dok su 2D materijali sintetizirani tehnikom rasta depozicijom kemijskih para. Uzorci su se pobudivali ultrakratkim laserskim pulsevima generiranim pomoću nekolinearnog optičkog parametarskog pojačala. Mjerenja promjene transmisivnosti i refleksivnosti su se provodila na različitim snagama pumpnog pulsa s srednjom valnom duljinom od 450 nm kako bi se dobio utjecaj parametara sinteze na dinamiku pobudenih nosioca naboja. Za ispitni puls, kojim se istražuju tranzijentna stanja, korišten je superkontinuum bijele svjetlosti generiran u pločici kalcijevog fluorida.

Abstract (english)

The main objective of the study was to investigate the photophysical properties of various semiconductor thin films of transition metal dihalides and oxynitrides, and based on these properties, develop a model of charge carrier dynamics and assess their potential application in the industry. The transition metal oxide and oxynitride semiconductors were grown using the magnetron sputtering technique, while 2D materials were synthesized by means of chemical vapor deposition. The samples were excited with ultrashort laser pulses generated by a non-collinear optical parametric amplifier. Measurements were conducted at different pump pulse powers with a fixed central wavelength of 450 nm to determine the impact of synthesis parameters on the dynamics of the excited charge carriers. For the probe pulse, which investigates transient states, a supercontinuum of white light generated in a calcium fluoride plate was used.

• Keywords: tranzijentna apsorpcija; tanki filmovi; 2D materijali; fotokataliza
• Keywords (english): transient absorption; thin films; 2D materials; photocatalysis
• Language: croatian
• URN:NBN: urn:nbn:hr:217:904127
• Study programme: Title: The University Integrated Undergraduate and Graduate Programme in Physics; Research Physics; specializations in: Research Physics; Course: Research Physics; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: sveučilišni magistar fizike (sveučilišni magistar fizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-09-09 10:12:16