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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Effect Of Interfacial Top Electrode Layer On The Performance Of Niobium Oxide Based Resistive Random Access Memory

Manjunath, Vishal Jain 11 July 2019 (has links)
No description available.
2

Cellules photovoltaïques organiques sur substrat flexible avec électrode supérieure transparente / Organic photovoltaic cells on flexible substrate with top transparent electrode

Richet, Marina 13 March 2019 (has links)
Une cellule photovoltaïque organique est constituée d’une couche photoabsorbante comprise entre deux électrodes dont l’une au moins est transparente. Généralement, les cellules sont illuminées au travers de l’électrode inférieure transparente d’oxyde d’indium dopé à l’étain (ITO). Néanmoins, de nombreuses applications comme l’automobile nécessitant un éclairage par le dessus du module, nous nous sommes intéressés à l'élaboration de cellules photovoltaïques sur substrat flexible, avec l'électrode inférieure opaque et l'électrode transparente déposée sur le dessus de la cellule. Deux types d'architectures ont été développés. Dans le premier cas, la cellule solaire organique finale a été entièrement déposée par des techniques de dépôt en voie liquide avec les deux électrodes en PEDOT:PSS imprimées par jet d’encre. Dans le second cas, les cellules ont été élaborées sur électrode d'argent avec une électrode supérieure transparente tricouche oxyde/métal/oxyde (MoO3/Ag/MoO3) évaporée thermiquement. Les cellules solaires organiques réalisées selon la seconde architecture ont été connectées en série afin de créer un module photovoltaïque organique. Ce dernier a permis d’alimenter et de faire briller une LED. / An organic solar cell is made of a photoactive layer sandwiched between two electrodes among which one at least is transparent. Usually, solar cells are illuminated through the tin-doped indium oxide (ITO) bottom transparent electrode. Nevertheless, many applications like automobile requiring illumination from above the module, we designed photovoltaic cells on a flexible substrate, with an opaque bottom electrode and a top transparent one. Two types of architectures were developed. At first, the final organic solar cell was fully deposited by solution-process with both electrodes made of ink-jet printed PEDOT:PSS. Then the cells were elaborated on a silver bottom electrode with a transparent evaporated oxide/metal/oxide (MoO3/Ag/MoO3) top electrode. The organic solar cells made according to the second structure were connected in series to create an organic photovoltaic module. It allowed to power and shine a white LED.
3

A spray-coating process for highly conductive silver nanowire networks as the transparent top-electrode for small molecule organic photovoltaics

Selzer, Franz, Weiß, Nelli, Kneppe, David, Bormann, Ludwig, Sachse, Christoph, Gaponik, Nikolai, Eychmüller, Alexander, Leo, Karl, Müller-Meskamp, Lars 16 December 2019 (has links)
We present a novel top-electrode spray-coating process for the solution-based deposition of silver nanowires (AgNWs) onto vacuum-processed small molecule organic electronic solar cells. The process is compatible with organic light emitting diodes (OLEDs) and organic light emitting thin film transistors (OLETs) as well. By modifying commonly synthesized AgNWs with a perfluorinated methacrylate, we are able to disperse these wires in a highly fluorinated solvent. This solvent does not dissolve most organic materials, enabling a top spray-coating process for sensitive small molecule and polymer-based devices. The optimized preparation of the novel AgNW dispersion and spray-coating at only 30 °C leads to high performance electrodes directly after the deposition, exhibiting a sheet resistance of 10.0 Ω □−1 at 87.4% transparency (80.0% with substrate). By spraying our novel AgNW dispersion in air onto the vacuum-processed organic p-i-n type solar cells, we obtain working solar cells with a power conversion efficiency (PCE) of 1.23%, compared to the air exposed reference devices employing thermally evaporated thin metal layers as the top-electrode.

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