Doctoral Dissertations

Qingzhi Chen

Abstract

"This research focuses on epitaxial electrodeposition of two coinage metals: Au and Ag thin films on the silicon surface and their applications in flexible electronics and energy conversion and storage. The first paper: Photoelectrochemistry of ultrathin, semi-transparent, and catalytic gold films electrodeposited epitaxially onto n-silicon (111) describes the epitaxial electrodeposition of Au thin films on n-type Si using a simple HAuCl4 bath and the photoelectrochemical properties of the Au-Si junction barrier. The effect of the Au layer on the interfacial energetics as well as the stability of the photoelectrode as a function of the Au coverage/thickness is determined in a regenerative cell. The second paper: Epitaxial lift-off of electrodeposited single-crystal gold foils for flexible electronics shows a technique for epitaxial lift-off of Au foils as semi-transparent, flexible and single crystal-like substrates for flexible electronics. A Au thin film is first deposited on Si and then photooxidation is performed followed by a lift-off process. The Au foils exhibit a low sheet resistance down to 7 ohms per square and show only a 4% increase in resistance after 4000 bending cycles. A flexible organic light-emitting diode that was spin-coated on a Au foil exploited the transmittance and flexibility of the foil. The third paper: Electrodeposition of nanometer-thick epitaxial films of silver onto single-crystal silicon wafers introduces the electrodeposition of epitaxial Ag thin films on n-type Si of three different low-index orientations from an acetate bath. A comparison of silver acetate electrolyte and cyanide electrolyte was also performed, showing advantages of the acetate bath over the cyanide bath for growth of epitaxial films of Ag on Si surfaces"--Abstract, page iv.

Advisor(s)

Switzer, Jay A., 1950-

Committee Member(s)

Leventis, Nicholas
Winiarz, Jeffrey G.
Nath, Manashi
Miller, F. Scott, 1956-

Department(s)

Chemistry

Degree Name

Ph. D. in Chemistry

Sponsor(s)

United States. Department of Energy. Office of Basic Energy Sciences

Comments

The work was supported by the U.S. Department Of Energy, Office of Basic Sciences under Grant No. DE-FG02-08ER46518.

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2019

Journal article titles appearing in thesis/dissertation

  • Photoelectrochemistry of ultrathin, semitransparent, and catalytic gold films electrodeposited epitaxially onto n-silicon (111)
  • Epitaxial lift-off of electrodeposited single-crystal gold foils for flexible electronics
  • Electrodeposition of nanometer-thick epitaxial films of silver onto single-crystal silicon wafers

Pagination

x, 115 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2019 Qingzhi Chen, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11586

Electronic OCLC #

1119723802

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