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undergraduate thesis
Određivanje optičkog procjepa tankog filma Taucovom metodom
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. urn:nbn:hr:149:665338
Miočić, Nikolina
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

Cite this document

Miočić, N. (2024). Određivanje optičkog procjepa tankog filma Taucovom metodom (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:665338

Miočić, Nikolina. "Određivanje optičkog procjepa tankog filma Taucovom metodom." Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. https://urn.nsk.hr/urn:nbn:hr:149:665338

Miočić, Nikolina. "Određivanje optičkog procjepa tankog filma Taucovom metodom." Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2024. https://urn.nsk.hr/urn:nbn:hr:149:665338

Miočić, N. (2024). 'Određivanje optičkog procjepa tankog filma Taucovom metodom', Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 26 December 2024, https://urn.nsk.hr/urn:nbn:hr:149:665338

Miočić N. Određivanje optičkog procjepa tankog filma Taucovom metodom [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2024 [cited 2024 December 26] Available at: https://urn.nsk.hr/urn:nbn:hr:149:665338

N. Miočić, "Određivanje optičkog procjepa tankog filma Taucovom metodom", Undergraduate thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:149:665338

Metadata
TitleOdređivanje optičkog procjepa tankog filma Taucovom metodom
Title (english)Determination of thin film bandgap by the use of Tauc's method
AuthorNikolina Miočić
MentorJelena Macan (mentor)
Committee memberJelena Macan (predsjednik povjerenstva)
Committee memberAnita Šalić (član povjerenstva)
Committee memberKatarina Mužina (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2024-09-16, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
Cilj ovog rada je određivanje optičkog procijepa za direktni i indirektni prijelaz elektrona tri uzorka tankih filmova lantanova manganita (LaMnO3) korištenjem Taucove, Codyjeve i Boltzmannove metode. Uzorci su pripremljeni različitim sintetskim postupcima što utječe na iznos optičkog procijepa. Morfološke karakteristike ispitane su pretražnom elektronskom mikroskopijom (SEM), te je vidljiva nehomogenost tankih filmova na sva tri uzorka što uvelike utječe na reflektanciju i transmitanciju. Optička svojstva analizirana su UV-Vis spektroskopijom u rasponu od 380 do 800 nm. Optički procijepi teško su odredivi za većinu uzoraka, te se nalaze u rasponu od 0,3 eV do 2,5 eV. Unatoč tome što se za određivanje optičkog procijepa najčešće koriste Taucova i Codyjeva metoda, pokazalo se da Boltzmannova metoda daje reprezentativnije rezultate jer uzima u obzir cijelu krivulju, a ne vizualno određeno linearno područje. Nijedna metoda nije uspjela sigurno odrediti dolazi li do direktnog ili indirektnog prijelaza elektrona, zbog čega je potrebno provesti dodatna istraživanja ili provesti matematička modeliranja. Odabir prikladne metode za karakterizaciju optičkih svojstava novih materijala u primjeni za fotonaponske ćelije od presudne je važnosti kako bi se dobili pouzdani rezultati.
Abstract (english)
The aim of this paper is to determine the band gap value for the direct and indirect electron transition of three samples of thin films of lanthanum manganite (LaMnO3) using Tauc, Cody and Boltzmann methods. The samples are prepared by different procedures which affects the band gap value. Morphological characteristics were examined by scanning electron microscopy (SEM), and the inhomogeneity of thin films on all three samples was visible, which greatly affects reflectance and transmittance. Optical properties were analyzed by UV-Vis spectroscopy ranging from 380 to 800 nm. Band gap values, ranging from 0.3 eV to 2.5 eV, were difficult to determine for most samples. Although Tauc's and Cody's methods are most commonly used to determine the optical slit, Boltzmann's method has been shown to yield more representative results because it takes into account the entire curve rather than a visually defined linear region. Neither method has been able to determine for sure whether there is a direct or indirect electron transition, which requires additional research or mathematical modeling. It is important to choose the appropriate method for characterizing the optical properties of new materials in application for photovoltaic cells in order to get the most accurate results possible.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:665338
Study programmeTitle: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry
Course: Advanced materials and technologies
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2024-11-15 13:15:43