Kristalizacija tankih manganitnih prevlaka izlaganjem intenzivnoj pulsirajućoj svjetlosti

master's thesis

• Title (english): Crystallization of thin manganite coatings using intense pulsed light
• Author: Tea Vlašić
• Mentor: Jelena Macan (mentor)
• Committee member: Jelena Macan (predsjednik povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Committee member: Katarina Mužina (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Cilj ovog rada bio je sintetizirati tanke filmove lantanovog manganita (LaMnO3) i proučiti njihova svojstva za primjenu u perovskitnim solarnim ćelijama koje se sve više proučavaju kao alternativa silicijevim solarnim ćelijama. Solarne ćelije predstavljaju zeleni izvor energije te su građene od više slojeva, a upravo su slojevita struktura i sastavi slojeva na bazi perovskita glavni predmeti istraživanja zbog velike učinkovitosti i potencijala za raznovrsnu primjenu. Karakteristični LaMnO3 tanki filmovi pripremljeni su iz viskozne otopine metalnih nitrata kompleksiranih dodatkom limunske kiseline. Sinteza je provedena prema postupku samozapaljenja, ali je prekidana u trenutku geliranja. Viskozna otopina prekursora je na staklene podloge nanošena postupkom prevlačenja rotacijom, a kristalizacija otopine prekursora u manganitnu fazu provedena je koristeći novoproučavanu tehniku intenzivne pulsirajuće svjetlosti (IPL). IPL fototretman pokazao se kao prikladan, ekonomičan i djelotvoran postupak za stvaranje potrebnih tankih filmova. Kao rezultat pripreme dobiveni su tanki filmovi hrapave površine s kristaliziranom LaMnO3 strukturnom fazom te popratnim nusproduktima. Mjerenjem optičkih svojstava pripremljenih materijala otkriveno je kako uzorci posjeduju optički procjep između 1,3 i 1,5 eV. Dobivene vrijednosti slažu se s ostalim proučavanim materijalima koji svoju uporabu pronalaze u strukturi solarnih ćelija. Tanke filmove LaMnO3 koji su dobiveni izlaganjem intenzivnoj pulsirajućoj svjetlosti potrebno je detaljnije proučavati i optimirati njihova svojstva kako bi imali mogućnost uporabe kao aktivni sloj u anorganskim perovskitnim solarnim ćelijama.

Abstract (english)

The aim of this work was to synthesize lanthanum manganite (LaMnO3) thin films and study their properties for application in perovskite solar cells, which are increasingly being studied as an alternative to silicon solar cells. Solar cells represent a green source of energy and have a structure of several layers, and precisely the layered structure and composition of layers based on perovskite are the main subjects of research due to their high efficiency and potential for various applications. Characteristic LaMnO3 thin films were prepared from a viscous solution of metal nitrates complexed with the addition of citric acid. The synthesis was carried out using autocombustion process, but it was interrupted at the moment of gelation. The viscous precursor solution was applied to the glass substrates by spin coating method, and the crystallization of the precursor solution into the manganite phase was carried out using the newly studied technique of intense pulsed light (IPL). IPL phototreatment has proven to be a suitable, economical and effective procedure for creating the necessary thin films. As a result of the preparation, thin films with a rough surface and with a crystallized LaMnO3 structural phase and accompanying byproducts were obtained. By measuring the optical properties of the prepared materials, it was revealed that the samples had an optical gap between 1.3 and 1.5 eV. The obtained values agreed with other studied materials that found their use in the structure of solar cells. LaMnO3 thin films obtained by exposure to intense pulsed light need to be studied in more detail and their properties need to be optimized in order to have the possibility of being used as an active layer in inorganic perovskite solar cells.

• Keywords: intenzivna pulsirajuća svjetlost; lantanov manganit; optička svojstva; perovskitne solarne ćelije; tanki filmovi
• Keywords (english): intense pulsed light; lanthanum manganite; optical properties; perovskite solar cells; thin films
• Language: croatian
• URN:NBN: urn:nbn:hr:149:159704
• Project: Number: UIP-2020-02-9139; Title: Fotonsko sinteriranje inkjet ispisanih elektrokemijskih senzora i biosenzora na plastičnim podlogama; Title: Photonic sintering for inkjet printed electrochemical sensors and biosensors on plastic substrates; Acronym: PrintEChemSens; Leader: Petar Kassal; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: UIP
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-11-20 13:39:28