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Theses/Dissertations

Nanocrystal

Mechanics of Materials

Publication Year

Articles 1 - 3 of 3

Full-Text Articles in Nanoscience and Nanotechnology

Flexible, Photopatterned, Colloidal Cdse Semiconductor Nanocrystal Integrated Circuits, Franklin Scott Stinner Jan 2017

Flexible, Photopatterned, Colloidal Cdse Semiconductor Nanocrystal Integrated Circuits, Franklin Scott Stinner

Publicly Accessible Penn Dissertations

As semiconductor manufacturing pushes towards smaller and faster transistors, a parallel goal exists to create transistors which are not nearly as small. These transistors are not intended to match the performance of traditional crystalline semiconductors; they are designed to be significantly lower in cost and manufactured using methods that can make them physically flexible for applications where form is more important than speed. One of the developing technologies for this application is semiconductor nanocrystals.

We first explore methods to develop CdSe nanocrystal semiconducting “inks” into large-scale, high-speed integrated circuits. We demonstrate photopatterned transistors with mobilities of 10 cm2/Vs on ...


Shape-Control And Doping Of Lanthanides And Transition Metal Oxide Nanocrystals With Tailored Properties And Their Shape-Directed Self-Assembly, Taejong Paik Jan 2014

Shape-Control And Doping Of Lanthanides And Transition Metal Oxide Nanocrystals With Tailored Properties And Their Shape-Directed Self-Assembly, Taejong Paik

Publicly Accessible Penn Dissertations

Lanthanide and transition metal oxides are widely used in various applications such phosphors, lasers, magnets, and catalysts, and have formed an important platform for biomedical research and clinical medicine. The synthesis of highly uniform nanomaterials with controlled size, shape, and compositions is paramount to precisely understanding their physical properties and to arrange them into highly ordered arrays to design functional metamaterials. Herein, I describe novel chemistry to synthesize highly uniform lanthanide and transition metal oxide nanocrystals. The size, shape, and compositions of lanthanide-based nanocrystals are systematically controlled with the addition of alkali metal salts. The reaction mechanism is investigated to ...


Semiconductor Nanocrystal Building Blocks For Solar Applications: Synthesis, Self-Assembly, And Film Characterization, Danielle Christina Reifsnyder Jan 2013

Semiconductor Nanocrystal Building Blocks For Solar Applications: Synthesis, Self-Assembly, And Film Characterization, Danielle Christina Reifsnyder

Publicly Accessible Penn Dissertations

Semiconductor nanocrystals have emerged as promising materials for light harvesting and production of electrical energy. Their unique optical properties and solution processibility suggest that they can be utilized in new ways to build on the knowledge base existing from the study of bulk semiconductors. Here, CuInSe2, CdTe, and CdSe are discussed. Synthetic control of size, shape, crystal structure, and elemental composition are crucial to realizing the potential of these nanoscale building blocks. In this work, new methods for colloidal synthesis of semiconducting nanocrystals are presented. As a consequence, the improved control over structure makes it possible to self-assemble them into ...