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Title:Uporaba inverzne geometrijske konfiguracije za razvoj senzorskih in elektrokromnih trakov : doktorska disertacija
Authors:Rozman, Martin (Author)
Bren, Urban (Mentor) More about this mentor... New window
Fuchs-Godec, Regina (Co-mentor)
Files:.pdf DOK_Rozman_Martin_2020.pdf (49,32 MB)
MD5: 9564236CAD20150D568DB223E4855AFF
 
Language:Slovenian
Work type:Doctoral dissertation (mb31)
Typology:2.08 - Doctoral Dissertation
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Optoelektronika je del naravoslovnih ved, ki se ukvarja s pretvorbo svetlobnega odziva v električni signal ali obratno. Primera takšnih sistemov sta elektronski papir (električni signal se pretvori v svetlobni) in sončne celice (svetlobni signal se pretvori v električni). Pri elektronskem papirju govorimo o pojavu elektrokromizma, medtem ko pri sončnih celicah govorimo o fotoefektu. Oba sistema sta po principu izgradnje precej podobna, saj po navadi uporabljata vsaj eno optično transparentno elektrodo (OTE), protielektrodo ter elektrolit, ki interagira z aktivno komponento, nanešeno na OTE. Optično transparentne elektrode tako predstavljajo ozko grlo razvoja novih aplikacij, saj imajo omejeno specifično električno prevodnost, prav tako pa je izdelava teh elektrod dražja in zahtevnejša od navadnih kovinskih elektrod. Glavno omejitev optoelektronskih naprav je doslej predstavljal izbor materialov za OTE, saj so ti omejeni na steklene ali plastične nosilce z naprašeno kovino ali kovinskim oksidom ter na prevodne prosojne polimere. Za razliko od prosojnih nosilcev s prevodno snovjo in prevodnih polimerov je tehnologija izdelave kovinskih folij precej starejša. Le-te niso prosojne, zaradi česar v industriji izdelave zaslonov niso zaželene, vendar jih odlikujejo odlične mehanske in kemijske lastnosti ter izjemna temperaturna vzdržljivost. Kovinske folije imajo tudi v praktično vseh primerih višjo specifično prevodnost od OTE, zaradi česar bolje prevajajo električni tok. Iz znanstvene literature je razvidno, da vse praktične elektrokromne naprave in fotosenzorji potrebujejo vsaj eno optično prosojno elektrodo. Namen doktorske disertacije je omogočiti nove načine izgradnje optoelektronskih naprav, ki bodo uporabljali novo geometrijsko konfiguracijo. Le-ta bo uporabna tako za sestavo elektrokromnih naprav, kot tudi fotosenzorjev. Ker je praktično nemogoče narediti elektrokromno napravo ali fotosenzor v konfiguraciji, kjer sta neprosojni elektrodi ena na drugi z vmesno plastjo elektrolita, je treba uvesti nekaj rešitev, da lahko naredimo polprosojne optične elektrode ali pa moramo napravo sestaviti na takšen način, da neprepustnost kovinskih elektrod za svetlobo ne bo predstavljala problema. Na osnovi geometrijskih modifikacij je mogoče omenjene elektrokemijske sisteme prilagoditi tako, da za svoje delovanje ne potrebujejo OTE. Na tak način je mogoče sestaviti elektronski papir ali sončne celice v obliki traku, upogljivih plošč ali tankih vrvi. Težava, ki nastopa hkrati z geometrijo sistema, pa je optimizacija elektrokemijskega sistema. Ta zahteva ustrezno kombinacijo kovinskih elektrod, elektrolita in elektrokromne ali fotovoltaične reakcije ter optimizacijo časovnega odziva, ki je v večini primerov odvisen od difuzije ionov v sistemu. V doktorski disertaciji je tako prikazanih nekaj primerov, ki se ukvarjajo z razvojem optoelektronskih naprav v novi geometrijski konfiguraciji »inverznega sendviča«, del disertacije pa se ukvarja s primernimi mehanizmi, ki lahko delujejo v tej inovativni konfiguraciji. Z novimi geometrijskimi pristopi bi bilo mogoče v prihodnosti izdelati nove robustne elektrokemijsko aktivne tkanine in trakove tako za namen spreminjanja barve (elektrokromizem) kot za potrebe pridobivanja cenejše električne energije ali za detekcijo svetlobnega odziva (fotovoltaika).
Keywords:geometrijska konfiguracija, inverzni sendvič, elektrokromizem, fotovoltaika, nerjavno jeklo, difuzija
Year of publishing:2020
Place of performance:Maribor
Publisher:[M. Rozman]
Number of pages:VIII, 100 str.
Source:Maribor
UDC:544.164.032.52:669.14.018.8(043.3)
COBISS_ID:39437571 New window
NUK URN:URN:SI:UM:DK:ZZNUIKCN
Views:266
Downloads:59
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Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:06.10.2020

Secondary language

Language:English
Title:Use of an inverted geometrical configuration in the development of sensor tapes and tapes with electronic ink
Abstract:Optoelectronics forms a branch of natural sciences, which studies conversion of light into electrical response and vice versa. Examples include electronic paper (electrical signal converted to light) and solar cells (light conversion into electricity). When discussing electronic paper, we usually focus on electrochromism, while with solar cells are functioning on the principle of photoeffect. Both systems use similar architectures, since they usually both apply at least one optically transparent electrode (OTE), counter electrode and electrolyte, which interacts with the active component applied on the OTE. Optically transparent electrodes represent a bottleneck in the research of new optoelectronic applications, since they have limited specific electrical conductivity, while the manufacturing of this type of electrodes is more expensive than that of metal sheet electrodes. The main limitation of optoelectronic devices so far has been the choice of materials for OTE, as these are limited to glass or plastic carriers with powdered metal or metal oxide coatings and to conductive transparent polymers. Unlike transparent carriers with a conductive substance and conductive polymers, the technology of making metal foils is much older. These metal foils are not transparent, which makes them undesirable in the screen manufacturing industry, but they are distinguished by excellent mechanical and chemical properties as well as exceptional temperature resistance. Metal foils also possess a higher specific conductivity than OTE in almost all cases, which makes them better electrical conductors. It is clear from the scientific literature that all practical electrochromic devices and photosensors need at least one optically transparent electrode. The purpose of the doctoral dissertation is to discover new possibilities on how to build optoelectronic devices, which will use novel geometric configuration. This configuration should be practically applicable to both electrochromic devices as well as to photosensors. Electrochromic device or photosensor, where the non-transparent electrodes are positioned on top of each other with a layer of electrolyte in between, for the purpose of making a device with qualities of semi-transparent optical electrodes is literally impossible to build on existing systems without extensive modifications. It is however possible, to construct such a device, if we build it in a way, where the transparency of the electrode does not form a requirement. Electrochemical systems can be adapted so that they do not require OTE for their operation. In this way, it is possible to assemble electronic paper or solar cells in the form of a tape, flexible plates or thin ropes. The problem with the geometry of the device is the optimization of the electrochemical system itself. This includes finding an appropriate combination of metal electrodes, electrolyte and electrochromic or photovoltaic reactions as well as optimization of the time response, which in most cases depends on the diffusion of ions in the system. The doctoral thesis introduces the use of a new geometric configuration of the "inverse sandwich" in optoelectronic applications and deals with appropriate mechanisms that can operate in the presented configuration. With new geometric approaches, it would be in the future possible to develop new robust electrochemically active fabrics and strips both for the purpose of changing color (electrochromism) and for the purpose of obtaining cheaper electricity or light response detection (photovoltaics).
Keywords:geometry configuration, inverted sandwich, electrochromism, photovoltaics, stainless steel, diffusion


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