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Untersuchungen zur Dehnbarkeit von transparenten Elektroden und Permeationsbarriereschichten auf Ethylentetrafluorethylen Kunststofffolie

Investigations of the stretchiness of transparent electrodes and permeation barrier layers on ethylene tetrafluoroethylene plastic film

  • Diese Arbeit beschäftigt sich mit der Dehnbarkeit von gesputterten transparenten Dünnschicht-Elektroden wie Indium-Zinn-Oxid (ITO) und Wasserdampf-Permeationsbarrieren wie Zink-Zinn-Oxid (ZTO) auf Ethylentetrafluorethylen (ETFE) Kunststofffolie. Dabei wird der Einfluss der Rissbildung auf den Widerstand der Elektrodenschichten ermittelt. Diese sollen für die ausreichende Leitfähigkeit für Elektrochrome Zellen und organische Solarzellen sorgen. Aufgrund der Verwendung dieser Zellen im architektonischen Bereich treten hohe mechanische Belastungen auf. Umwelteinflüsse und Anwendung verursachen Dehnungen und Spannungen in den Systemen und können zum Reißen der Schichten führen. Daher wird das Verhalten von Einzelschichten und Schichtsystemen unter Dehnung in dieser Arbeit untersucht. Allgemein wurde festgestellt, dass die kritischen Dehnungen von ZTO Einzelschichten mit 0,5
  • Within this thesis, a systematic study of the stretchiness of sputtered transparent thin film electrodes such as indium tin oxide (ITO) and water vapor permeation barriers such as zinc-tin oxide (ZTO) on ethylene tetrafluoroethylene (ETFE) plastic film is presented. The influence of crack formation on the resistance of the electrode layers is determined. These are intended to ensure enough conductivity for both electrochromic cells and organic solar cells. Due to the usage of these cells in the architectural background, one key feature consists of their ability to take high mechanical loads. Environmental influences and application cause strains and stresses to the systems and may cause cracking of the layers. To get insights into the structure-effect-relationships between cells and the applied mechanical stress, this work is focused on related characteristics of both single and multiple layers. Generally, it has been found that the critical strains of ZTO single layers with 0.5-1 % elongation are lower than those of ITO. Consequently, layers in ZTO tend to crack at lower elongations compared to ITO, causing complete degradation of the whole layer stack. These immediately lead to the destruction of the layer. Additionally, thicker layers crack sooner than thin ones because they have higher intrinsic stresses. The sheet resistance of the ITO increased non-linearly with increasing elongation. This is due to the spread of cracks in the layer. In the ZTO-ITO multilayer system, the ZTO determines the critical strain; the indium tin oxide has no influence. Also multilayer systems of ZTO silver ITO and ITO silver ITO were deposited. Those systems revealed enhanced conductivity, caused by the added metal layer. These samples had significantly higher critical strains than the ZTO-ITO systems, the critical strain was above 0.9 % at any time. The metal layer leads to a mechanical decoupling of the individual layers and at the same time to higher internal compressive stresses, which counteract the tensile stresses that occur. Simultaneously SEM images have shown that some cracks do not run through the entire system leaving a good residual conductivity.

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Metadaten
Author:Stefan Hinze
Advisor:Stefan Braun, John FahlteichGND
Document Type:Master's Thesis
Language:German
External Institution:Fraunhofer Institut FEP
Winterbergstraße 28, 01277 Dresden
Date of Publication (online):2018/12/21
Year of first Publication:2018
Publishing Institution:Westsächsische Hochschule Zwickau
Release Date:2019/10/30
Tag:Dehnbarkeit; ITO; Permeationsbarriere; Transparente Elektroden; ZTO
Pagenumber:62 Seiten, 27 Abb., 3 Tab., 25 Lit.
Faculty:Westsächsische Hochschule Zwickau / Physikalische Technik, Informatik