자료유형  

 학위논문

Control Number  

0016934549

International Standard Book Number  

9798380482257

Dewey Decimal Classification Number  

600

Main Entry-Personal Name  

Pan, Ziyi.

Publication, Distribution, etc. (Imprint  

[S.l.] : Stanford University., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(143 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-04, Section: B.

General Note  

Advisor: Dauskardt, Reinhold H.

Dissertation Note  

Thesis (Ph.D.)--Stanford University, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약Emerging optoelectronic devices often require moisture barriers to prevent water ingress. While a variety of methods exist to limit moisture ingress including glass/glass encapsulation and multilayer films produced in vacuum environments, they present disadvantages in terms of rigidity, weight, cost and method of application. A rapid, conformal, and low-cost barrier coating method that can be applied in open-air for moisture barrier protection presents an attractive opportunity. A compounding aspect of barrier evaluation is the need for a both accurate and high throughput methodology. Existing calcium film testing and permeation testing methods for evaluating the water vapor transmission rate through moisture barriers while accurate surfer from low-throughput and the need for complex fabrication process or vacuum chambers. In this dissertation, we show the development of different types of moisture barriers via plasma deposition in open-air and demonstrate a rapid testing methodology using infrared imaging to evaluate the moisture barrier efficacy.Firstly, I will demonstrate a spatially resolved imaging methodology for water vapor transmission rate (WVTR) testing that relies on quantified infrared characterization at water absorption bands. This technique is validated using a moisture barrier on a polymer substrate via calibration of the infrared image intensity with moisture content in the polymer substrate from images taken at different times. This method is compared to existing state of the art techniques such as membrane permeation measurement and optical calcium film testing. This fast, nondestructive and in-situ method enables defect visualization and shows the WVTR with a sensitivity limit of 5·10-5 g/m2/day, on par with commercial permeation instrumentation.Secondly, I will describe an open-air spray plasma deposition processing as a highly tunable method to rapidly deposit thin film moisture barriers. A low-cost and commercially available organo-silane precursor with a carbon-bridge, 1,2-bis(triethoxysilyl)-ethane (BTESE), is used here in the open-air spray plasma processing. The whole deposition process is environmentally benign with green solvents and common monomer, and easily applied to large scale deposition. The films are highly transparent, tunable in thickness and mechanical properties, and exhibiting a water vapor transmission rate at about 1.5 g/m2/day under an accelerated aging condition of 38 °C and 90% relative humidity (R.H.), a tenfold increase in moisture barrier efficacy compared to bare polymer substrates. The barrier films are directly applied to perovskite solar devices, which are especially moisture-sensitive, and enable the devices to retain 80% of their initial performance for over 600 hours in ambient conditions, while the control devices decreased to 20% of their performance after 200 hours. Additionally, the barrier films are mechanically robust, exhibiting a threefold increase in adhesion energy and fourfold increase in Young's modulus compared to commercial polysiloxane coatings.Finally, I will present a multilayer moisture barrier design with alternating layers of inorganic SiO2 thin film and conformal organosilicate film to prevent moisture ingress deposited via a scalable, open-air plasma processing. The inorganic layer effectively blocks moisture ingress and the organsilicate layer decouples any pinhole defects in the inorganic layer.

Subject Added Entry-Topical Term  

Mechanical properties.

Subject Added Entry-Topical Term  

Plasma.

Subject Added Entry-Topical Term  

Humidity.

Subject Added Entry-Topical Term  

Electrodes.

Subject Added Entry-Topical Term  

Glass.

Subject Added Entry-Topical Term  

Infrared imaging systems.

Subject Added Entry-Topical Term  

Energy.

Subject Added Entry-Topical Term  

Gas flow.

Subject Added Entry-Topical Term  

Thin films.

Subject Added Entry-Topical Term  

Food packaging.

Subject Added Entry-Topical Term  

Nitrogen.

Subject Added Entry-Topical Term  

Polymers.

Subject Added Entry-Topical Term  

Silicon nitride.

Subject Added Entry-Topical Term  

Carbon.

Subject Added Entry-Topical Term  

Chemical vapor deposition.

Subject Added Entry-Topical Term  

Emission standards.

Subject Added Entry-Topical Term  

Condensed matter physics.

Subject Added Entry-Topical Term  

Materials science.

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Mechanics.

Subject Added Entry-Topical Term  

Packaging.

Subject Added Entry-Topical Term  

Physics.

Subject Added Entry-Topical Term  

Polymer chemistry.

Added Entry-Corporate Name  

Stanford University.

Host Item Entry  

Dissertations Abstracts International. 85-04B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:643575