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Crystal Growth and Surface Modification of Pyrite for Use as a Photovoltaic Material

Author: Eric Rustad Young
Publisher: [Portland, Or.] : Portland State University, 2018 ©2018
Dissertation: Ph. D. Portland State University 2018
Edition/Format:   Thesis/dissertation : Document : Thesis/dissertation : State or province government publication : eBook   Computer File : English
Summary:
Pyrite (FeS₂) has recently attracted significant interest as a photovoltaic material due to its promising optical properties, high photon to electron conversion yield, and low-cost raw materials. However, hopes have been tempered by recent discoveries that suggest the presence of hard to remove bulk sulfur defects. This research was focused on engineering and implementing the crystallization of pyrite from a sulfur  Read more...
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Details

Genre/Form: Academic theses
Material Type: Document, Thesis/dissertation, Government publication, State or province government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Eric Rustad Young
OCLC Number: 1056252300
Notes: Title from pdf title page viewed on October 4, 2018.
Description: 1 online resource (xvi, 124 pages) : illustrations (some color)
Responsibility: by Eric Rustad Young.

Abstract:

Pyrite (FeS₂) has recently attracted significant interest as a photovoltaic material due to its promising optical properties, high photon to electron conversion yield, and low-cost raw materials. However, hopes have been tempered by recent discoveries that suggest the presence of hard to remove bulk sulfur defects. This research was focused on engineering and implementing the crystallization of pyrite from a sulfur rich solution to counteract the material's natural tendency to form bulk sulfur defects. Homoeptiaxial layers and single-crystal samples have been grown from tellurium sulfur melts with an Fe:S ratio of 1:4 using both natural and synthetic substrates. The homoepitaxial layer has been characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM), confirming the epitaxial nature of the synthetic FeS₂ layer, and X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS) to better understand the energetics of the grown materials. Furthermore, epitaxial growth onto natural pyrite, in contrast to substrate etching, was established using sulfur-34 substitution and secondary ion mass spectrometry (SIMS). Growth onto synthetic pyrite was also described. Finally, the photovoltaic properties of homoepitaxial layers of high temperature solution growth pyrite onto a synthetic templating crystal was characterized using electrochemical methods.

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