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Development of Solution Processed Thin Film Barriers for Encapsulating Thin Film Electronics ; Entwicklung von lösungsprozessierten Dünnschichtbarrieren für die Verpackung von Dünnschichtelektronik
Recently, organic solar cells (OSCs) with efficiencies of 17% have been demonstrated, which brings organic photovoltaics in the same league as inorganic thin film technologies. OSCs require encapsulation by transparent and high quality barrier materials to achieve decent lifetimes without compromising performance. The most common practice for encapsulation of the OSCs is the lamination between barrier sheets using adhesives. This lamination process adds extra processing steps and thus increases overall processing cost and limits the throughput. Many attempts have thus been made to create coated barriers with quality comparable to those processed from vacuum assisted techniques. Direct application of coated barriers on top of OSCs will not only minimize cost but also maximize throughput as direct coating processes can be performed with roll-to-roll methods. Therefore, the goal of this work is the development of materials and processes for the encapsulation of organic thin films electronics by direct coating. The thesis is subdivided into six chapters. The main objective of Chapter 1 is to express the motivation towards the research direction. In this chapter, also the challenges and hurdles faced by coated barriers are discussed. Chapter 2 describes the theoretical background of diffusion and permeability and introduces industrial units for measuring the barrier quality. Various factors are also defined briefly which influence the barrier quality. This chapter gives theoretical details of the barriers based on filler platelets and describes various theoretical models for predicting the barrier quality from the platelet properties such as size, shape, concentration and orientation. Finally basics about organic solar cells and the working principle along with degradation mechanism are described in this chapter. Chapter 3 describes the state of the art of coated barriers. Silica layers processed from the polymer class of polysilazanes are also described in detail, along with the methods of processing. Finally, ...
Development of Solution Processed Thin Film Barriers for Encapsulating Thin Film Electronics ; Entwicklung von lösungsprozessierten Dünnschichtbarrieren für die Verpackung von Dünnschichtelektronik
Recently, organic solar cells (OSCs) with efficiencies of 17% have been demonstrated, which brings organic photovoltaics in the same league as inorganic thin film technologies. OSCs require encapsulation by transparent and high quality barrier materials to achieve decent lifetimes without compromising performance. The most common practice for encapsulation of the OSCs is the lamination between barrier sheets using adhesives. This lamination process adds extra processing steps and thus increases overall processing cost and limits the throughput. Many attempts have thus been made to create coated barriers with quality comparable to those processed from vacuum assisted techniques. Direct application of coated barriers on top of OSCs will not only minimize cost but also maximize throughput as direct coating processes can be performed with roll-to-roll methods. Therefore, the goal of this work is the development of materials and processes for the encapsulation of organic thin films electronics by direct coating. The thesis is subdivided into six chapters. The main objective of Chapter 1 is to express the motivation towards the research direction. In this chapter, also the challenges and hurdles faced by coated barriers are discussed. Chapter 2 describes the theoretical background of diffusion and permeability and introduces industrial units for measuring the barrier quality. Various factors are also defined briefly which influence the barrier quality. This chapter gives theoretical details of the barriers based on filler platelets and describes various theoretical models for predicting the barrier quality from the platelet properties such as size, shape, concentration and orientation. Finally basics about organic solar cells and the working principle along with degradation mechanism are described in this chapter. Chapter 3 describes the state of the art of coated barriers. Silica layers processed from the polymer class of polysilazanes are also described in detail, along with the methods of processing. Finally, ...
Development of Solution Processed Thin Film Barriers for Encapsulating Thin Film Electronics ; Entwicklung von lösungsprozessierten Dünnschichtbarrieren für die Verpackung von Dünnschichtelektronik
Channa, Iftikhar Ahmed (author)
2019-01-01
Theses
Electronic Resource
English
DDC:
624
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