An Experimental Determination of the Quasi-Rest Potential of Copper Indium Disulfide Utilizing the Novel Open-Circuit Voltage Transient

<p> Environmental sustainability requires resource management that takes future generations into account. The present generation has witnessed changes across the planet, unprecedented in human history and disrupting communities and cities around the world, due to shifting global climate. This...

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Main Author: Newell, Michael Jason
Language:EN
Published: Arkansas State University 2017
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Online Access:http://pqdtopen.proquest.com/#viewpdf?dispub=10638267
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spelling ndltd-PROQUEST-oai-pqdtoai.proquest.com-106382672017-12-07T16:10:54Z An Experimental Determination of the Quasi-Rest Potential of Copper Indium Disulfide Utilizing the Novel Open-Circuit Voltage Transient Newell, Michael Jason Electrical engineering|Environmental science|Materials science <p> Environmental sustainability requires resource management that takes future generations into account. The present generation has witnessed changes across the planet, unprecedented in human history and disrupting communities and cities around the world, due to shifting global climate. This is primarily the result of fossil fuels, which powered modern civilization but dramatically increased levels of CO<sub>2</sub> and other greenhouse gases, and may be the least sustainable aspect of human civilization. Chapter 1 justifies the research from an environmental perspective and provides initial research parameters. Thin film photovoltaic (PV) modules are reported the most sustainable among energy production technologies currently available. Electrodeposited PV layers offer significant improvement to sustainability metrics over current thin film production methods, at reduced cost, but have rarely been demonstrated on an industrial scale. </p><p> Quasi-rest potential (QRP) ultimately led to large-scale, electrodeposited thin film CdTe modules. An in-situ material characterization technique that allows adjustment of the deposition voltage (V<sub>dep</sub>) to match the exact experimental conditions, QRP enabled precise control of deposit stoichiometry and crystallinity. Chapter 2 discusses theory and literature regarding QRP, and introduces the open-circuit voltage transient (V<sub>oc </sub>T), developed by the present research for analyzing QRP as a function of both V<sub>dep</sub> and time. V<sub>oc</sub>T data from a CdTe ethylene glycol bath matches details and speculations from the literature. </p><p> Although predicted to have wide applicability, experimental QRP data have never been published for compounds unrelated to CdTe. Chapter 3 discusses V<sub>oc</sub>Ts performed in pursuit of electrodeposited CuInS<sub>2</sub>, demonstrating functionality as a QRP scan in a variety of ethylene glycol solutions. Stoichiometries of deposited films were improved by using the V<sub> oc</sub>T to determine appropriate plating voltages. V<sub>oc</sub>Ts enabled QRP, in-situ rest potential (E<sub>M2</sub>), and current simultaneously vs V<sub>dep</sub> and correlated with cyclic voltammetry experiments. Films approaching stoichiometric CuInS<sub>2</sub> were generally obtained around -1 V vs Ag/AgCl, just noble of onset of metallic indium deposition, with a QRP around -0.8 V and E<sub>M2</sub> between -0.55 V and -0.6 V. Sulfur content of deposited films could also be significantly increased during deposition using open-circuit techniques based on V<sub>oc</sub>T data. Serendipitous production of large copper sulfide nanowires is briefly discussed.</p><p> Arkansas State University 2017-12-05 00:00:00.0 thesis http://pqdtopen.proquest.com/#viewpdf?dispub=10638267 EN
collection NDLTD
language EN
sources NDLTD
topic Electrical engineering|Environmental science|Materials science
spellingShingle Electrical engineering|Environmental science|Materials science
Newell, Michael Jason
An Experimental Determination of the Quasi-Rest Potential of Copper Indium Disulfide Utilizing the Novel Open-Circuit Voltage Transient
description <p> Environmental sustainability requires resource management that takes future generations into account. The present generation has witnessed changes across the planet, unprecedented in human history and disrupting communities and cities around the world, due to shifting global climate. This is primarily the result of fossil fuels, which powered modern civilization but dramatically increased levels of CO<sub>2</sub> and other greenhouse gases, and may be the least sustainable aspect of human civilization. Chapter 1 justifies the research from an environmental perspective and provides initial research parameters. Thin film photovoltaic (PV) modules are reported the most sustainable among energy production technologies currently available. Electrodeposited PV layers offer significant improvement to sustainability metrics over current thin film production methods, at reduced cost, but have rarely been demonstrated on an industrial scale. </p><p> Quasi-rest potential (QRP) ultimately led to large-scale, electrodeposited thin film CdTe modules. An in-situ material characterization technique that allows adjustment of the deposition voltage (V<sub>dep</sub>) to match the exact experimental conditions, QRP enabled precise control of deposit stoichiometry and crystallinity. Chapter 2 discusses theory and literature regarding QRP, and introduces the open-circuit voltage transient (V<sub>oc </sub>T), developed by the present research for analyzing QRP as a function of both V<sub>dep</sub> and time. V<sub>oc</sub>T data from a CdTe ethylene glycol bath matches details and speculations from the literature. </p><p> Although predicted to have wide applicability, experimental QRP data have never been published for compounds unrelated to CdTe. Chapter 3 discusses V<sub>oc</sub>Ts performed in pursuit of electrodeposited CuInS<sub>2</sub>, demonstrating functionality as a QRP scan in a variety of ethylene glycol solutions. Stoichiometries of deposited films were improved by using the V<sub> oc</sub>T to determine appropriate plating voltages. V<sub>oc</sub>Ts enabled QRP, in-situ rest potential (E<sub>M2</sub>), and current simultaneously vs V<sub>dep</sub> and correlated with cyclic voltammetry experiments. Films approaching stoichiometric CuInS<sub>2</sub> were generally obtained around -1 V vs Ag/AgCl, just noble of onset of metallic indium deposition, with a QRP around -0.8 V and E<sub>M2</sub> between -0.55 V and -0.6 V. Sulfur content of deposited films could also be significantly increased during deposition using open-circuit techniques based on V<sub>oc</sub>T data. Serendipitous production of large copper sulfide nanowires is briefly discussed.</p><p>
author Newell, Michael Jason
author_facet Newell, Michael Jason
author_sort Newell, Michael Jason
title An Experimental Determination of the Quasi-Rest Potential of Copper Indium Disulfide Utilizing the Novel Open-Circuit Voltage Transient
title_short An Experimental Determination of the Quasi-Rest Potential of Copper Indium Disulfide Utilizing the Novel Open-Circuit Voltage Transient
title_full An Experimental Determination of the Quasi-Rest Potential of Copper Indium Disulfide Utilizing the Novel Open-Circuit Voltage Transient
title_fullStr An Experimental Determination of the Quasi-Rest Potential of Copper Indium Disulfide Utilizing the Novel Open-Circuit Voltage Transient
title_full_unstemmed An Experimental Determination of the Quasi-Rest Potential of Copper Indium Disulfide Utilizing the Novel Open-Circuit Voltage Transient
title_sort experimental determination of the quasi-rest potential of copper indium disulfide utilizing the novel open-circuit voltage transient
publisher Arkansas State University
publishDate 2017
url http://pqdtopen.proquest.com/#viewpdf?dispub=10638267
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