Search results for "Kite"
showing 10 items of 1123 documents
Correlating Cathodoluminescence and Kelvin Probe Force Microscopy Measurements of Methylammonium-Free 2D Ruddlesden Popper Passivated Perovskite Abso…
2021
The Interplay of Contact Layers: How the Electron Transport Layer Influences Interfacial Recombination and Hole Extraction in Perovskite Solar Cells.
2018
Charge-selective contact layers in perovskite solar cells influence the current density–voltage hysteresis, an effect related to ion migration in the perovskite. As such, fullerene-based electron transport layers (ETLs) suppress hysteresis by reducing the mobile ion concentration. However, the impact of different ETLs on the electronic properties of other constituent device layers remains unclear. In this Kelvin probe force microscopy study, we compared potential distributions of methylammonium lead iodide-based solar cells with two ETLs (planar TiO2 and C60-functionalized self-assembled monolayer) with different hysteretic behavior. We found significant changes in the potential distributio…
Astana's architecture as a representation of the new Kazakhstan : political reading of Astana's built environment
2015
In my Master’s thesis I explore the political reasons behind Kazakhstan’s Almaty Astana capital relocation and the creation of the new capital Astana with new and futuristic architecture. The strategy is to analyse Kazakhstan’s capital relocation and Astana’s creation and beautification by applying Kenneth Burke’s concepts of the Dramatistic Pentad and the Idea of the Negative. Through Astana’s three most prominent new pieces of architecture, the Baiterek Tower, the Palace of Peace and Reconciliation and Khan Shatyr shopping and entertainment centre, I analyse Kazakhstan’s political aspirations and new representational practises. Through Astana’s architecture and Burke’s Dramatistic Pentad …
Building a Conceptual Skeleton for Enterprise Architecture Specifications
2006
Metal Halide Perovskites for Light-Emitting Applications
2019
Los dispositivos electrónicos modernos tales como televisores inteligentes, ordenadores portátiles, tabletas y teléfonos móviles requieren del uso de pantallas planas. Esto se logró en la última década usando pantallas de cristal líquido. Sin embargo, las proyecciones futuras llevan a usar pantallas flexibles y ligeras, un desafío importante para la tecnología convencional. Esto ha impulsado el desarrollo de materiales electroluminiscentes que son eficientes y tienen un contraste excelente. Como resultado de ello, nacieron los diodos orgánicos de emisión de luz (OLEDs), que han conseguido instalarse en el mercado. Sin embargo, esta tecnología es aún cara debido a la baja rentabilidad del pr…
In-depth structural analysis of lanthanoid coordination networks based on a flexible tripodal zwitterionic isonicotinate ligand
2019
Crystallizing metal–organic frameworks (MOFs) has been studied using a tripodal pyridinecarboxylic acid derivative ligand and selected lanthanoid salts. The zwitterionic ligand, 1,1′,1′′-((2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene))tris(pyridin-1-ium-4-carboxylate) (TTTPC) introduced as a bromide salt, forms coordination networks in aqueous environments and under ambient conditions with neodymium bromide, trifluoromethanesulfonate (OTf) or acetate (OAc). Seven structures are elucidated in detail using single crystal X-ray crystallography. TTTPC NdBr3, TTTPC NdBr2OTf, TTTPC NdBr(OTf)2 and TTTPC Nd(OTf)3 are porous 3D networks with similar ligand–metal and ligand–anion interactions, b…
Toward a new hybrid proton conductor: lanthanum niobate layered perovskites as a source of tailorable surfaces
2014
The modification of metal oxide surfaces with organic moieties has been widely studied as a method of preparing organic-inorganic hybrid materials for various applications. Among inorganic oxides, the ion-exchangeable layered perovskites [1], materials composed by perovskite-like slabs and intercalated cations, stimulated authors’ interest in reason of some encouraging electronic and reactive properties. In particular it is well known that the interlayer surface of such materials in their protonated form can be easily functionalized with organic groups (such as alcohols [2-3] or organophosphonic acids [4]) thus allowing the production of stable hybrid materials with new electronic and react…
Applications in nanophotonics of lead halide perovskite nanocrystals
2021
Tila, asuminen ja arkkitehtuuri : Henri Lefebvren teoria tilasta ja tilan tuottamisesta
2015
Tämän tutkielman aiheena on tilan (l ́espace) käsite ranskalaisen filosofin ja marxilaisena yhteiskuntateoreetikkona tunnetun Henri Lefebvren (1901–1991) ajattelussa. Lefebvre, jonka pääteos La Production de l'espace (”Tilan tuottaminen”) ilmestyi vuonna 1974, on yksi keskeisin 1900-luvun loppupuoliskolla yhteiskuntatieteissä tapahtuneen niin sanotun tilallisen käänteen taustateoreetikoista sekä yksi kaikista perusteellisimmin tilan käsitteen parissa työskennellyt filosofi. Tutkielmani pääkysymyksen muodostaa tilan ja tuotannon väliseen suhteen ongelma Lefebvrellä. Selvitän tutkielmassani miten Lefebvren tilan tuottamisen teoria rakentuu, ja miten se kehittyy teoreettiselta …
Zircon ages and Nd–Hf isotopes in UHT granulites of the Ider Complex: A cratonic terrane within the Central Asian Orogenic Belt in NW Mongolia
2015
Abstract The Ider Complex of the Tarbagatai Block in northwestern Mongolia is part of a Precambrian microcontinental terrane in the Central Asian Orogen Belt and has experienced a polymetamorphic tectono-metamorphic evolution. We have investigated an enderbitic gneiss, derived from a quartz diorite and a charnockite, derived from a leucogranite, and zircon SHRIMP data reveal late Archaean protolith ages of 2520–2546 Ma for these rocks. Metamorphic overgrowth on these zircons as well as newly-formed metamorphic zircons document a high-temperature metamorphic event (T = 930–950 °C) at about 1855–1860 Ma. Nd whole-rock isotopic systematics show these and other gneisses of the Ider Complex stra…