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Date Permissions Signed

3-12-2020

Date of Award

Winter 2020

Document Type

Masters Thesis

Department or Program Affiliation

Chemistry

Degree Name

Master of Science (MS)

Department

Chemistry

First Advisor

Patrick, David L.

Second Advisor

Leger, Janelle

Third Advisor

Emory, Steven R.

Abstract

Control over the size, shape, topology, orientation, and crystallographic phase of organic molecular materials is critical for a wide array of applications ranging from optoelectronics to pharmaceutical development. Herein, we demonstrate a relatively low-cost approach for fabricating single crystals with controlled sizes, shapes, microscale periodic features, preferred orientations and specific molecular packing modes. These features allow for the fabrication of intricate arrangements of single crystals for incorporation into complex device architectures, and potentially the endowment of tailored optical, electronic, thermal, and mechanical properties onto these materials. Patterning is achieved by utilizing an organic-vapor-liquid-solid (OVLS) deposition scheme paired with traditional photolithography methods. The OVLS approach involves spin coating a layer of a low vapor pressure solvent onto a substrate in order to drive up the critical nucleus size required for crystal nucleation, resulting in large grain sizes. This substrate is placed above a hot plate with the organic material to be sublimed. Our results show that millimeter-scale, ultrathin, planar organic molecular crystals can be grown on patterned substrates with rudimentary equipment (hot plate, spin coater, photoresist, photomask, UV source). We show that this technique is not only compatible with organic semiconductors, but also other organic molecular crystals such as pharmaceuticals.

Type

Text

Keywords

Organic molecular crystals, crystal engineering, organic semiconductor, topology, photonic crystals, polymorphism

Publisher

Western Washington University

OCLC Number

1145028582

Subject – LCSH

Molecular crystals--Research; Crystal growth; Semiconductor films; Organic solid state chemistry

Format

application/pdf

Genre/Form

masters theses

Language

English

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

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