자료유형  

 학위논문

Control Number  

0017163411

International Standard Book Number  

9798384054801

Dewey Decimal Classification Number  

620.11

Main Entry-Personal Name  

McAndrews, Gabriel Ryan.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of Colorado at Boulder., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

246 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

General Note  

Advisor: McGehee, Michael.

Dissertation Note  

Thesis (Ph.D.)--University of Colorado at Boulder, 2024.

Summary, Etc.  

요약This dissertation begins in Chapter 1 with an overview of the need for advancements in renewable energy and energy saving technologies with an introduction of technologies that are focused on: perovskite photovoltaics and dynamic windows. Despite the demonstrated promise of these thin film technologies to revolutionize their respective fields, several fundamental challenges remain. This thesis concerns itself with the challenges related to the mechanical reliability and stability of perovskite photovoltaics and dynamic windows. Chapter 2 provides background information on thin film mechanics and associated measurement methods to quantify stress and strain. The following three chapters highlights the work that I have done in my graduate school career on the development of thin film stress and strain in perovskite thin films. Chapter 3 details the complexity in which thermal stress develops in solution processed perovskite films which complicates the straightforward application of predictive equations. Chapter 4 aims to address a common misconception that had been present in the perovskite mechanics community: that thin contact layers with high coefficients of thermal expansion influence the underlying perovskite strain. Contrary to previously reported results, I show that a hot-casted, high coefficient of thermal expansion hole transport layer has minimal impact on the perovskite strain which aligns with predictions based on thin film mechanics theory. In Chapter 5, I unveil a new phenomenon for perovskite photovoltaics: stress relaxation driven by moisture uptake. I show that tension that is originally present within perovskites exhibits transient effects and that these films will alleviate their tension at the expense of degradation inducing uptake of foreign species such as moisture. In Chapter 6 details my efforts to understand and improve the durability of electrodeposited metal films for dynamic windows resting in a tinted state with transmission 0.1%. I show that windows based on Cu-Bi and Cu films mechanically fail due to stress corrosion cracking in less than 24 hours. With careful material selection I demonstrate that metal films based on Bi deposit under compression and are not susceptible to this failure mode and survive more than 9 weeks. Finally, Chapter 7 reflects on lingering hypotheses and provides perspective on potential future directions to extend the main ideas of this dissertation.

Subject Added Entry-Topical Term  

Materials science.

Subject Added Entry-Topical Term  

Engineering.

Subject Added Entry-Topical Term  

Mechanics.

Index Term-Uncontrolled  

Dynamic windows

Index Term-Uncontrolled  

Perovskite photovoltaics

Index Term-Uncontrolled  

Strain

Index Term-Uncontrolled  

Stress

Index Term-Uncontrolled  

Thin film mechanics

Added Entry-Corporate Name  

University of Colorado at Boulder Materials Science and Engineering

Host Item Entry  

Dissertations Abstracts International. 86-03B.

Electronic Location and Access  

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Control Number  

joongbu:653840