Electronic properties of metal nano-contacts to perovskite surfaces and interfaces / Ramsey A. Kraya.

Format:

Book

Manuscript

Thesis/Dissertation

Author/Creator:

Kraya, Ramsey A.

Contributor:

Bonnell, Dawn, advisor.

University of Pennsylvania.

Language:

English

Subjects (All):

Penn dissertations--Materials science and engineering.

Materials science and engineering--Penn dissertations.

Local Subjects:

Penn dissertations--Materials science and engineering.

Materials science and engineering--Penn dissertations.

Physical Description:

vii, 106 pages : illustrations (some color) ; 29 cm

Production:

2011.

Summary:

Metal-semiconductor interfaces will play an increasingly larger role in electronic and opto-electronic device performance. There has been much theoretical and experimental research devoted to studying the effects of downscaling on electronic behavior, and a number of different nanoscale techniques have been utilized to probe these interfaces including scanning tunneling microscopy (STM), atomic force microscopy (AFM), and ballistic electron emission microscopy (BEEM). This work lays the foundation for scanning probe analysis of metal nanoparticle contacts to perovskite surfaces and interfaces. Scanning probe methods, scanning tunneling microscopy (STM) and intermittent-contact atomic force microscopy (IC-AFM) along with scanning capacitance microscopy (SCM) were used in this study.

Metal nanoparticles on Nb-doped SrTiO3 were characterized by intermittent contact atomic force microscopy and contact spectroscopy. Size dependent transport characteristics were discovered and consistent with theoretical calculations. Furthermore, interface structure was shown to have a significant contribution to transport characteristics. Analysis of contact size near the Debye length showed that classical theory with an adjustment to account for edge effects as the most applicable method for explaining transport characteristics.

An extensive study of the electronic properties of reduced and oxidized Nb doped SrTiO3 show that oxygen defects contribute considerably to measured transport characteristics, indicating a large resistance for oxygen annealed surfaces, and scanning microwave microscopy revealed interesting behavior at high frequencies.

Notes:

Adviser: Dawn Bonnell.

Thesis (Ph.D. in Materials Science and Engineering) -- University of Pennsylvania, 2011.

Includes bibliographical references.