Scanning probe analysis of polydiacetylene nanowires and poly(3-hexylthiophene) thin films

Simple item page
dc.contributor.advisorKelly, Kevin F.
dc.creatorGiridharagopal, Rajiv
dc.date.accessioned2011-07-25T02:06:53Z
dc.date.available2011-07-25T02:06:53Z
dc.date.issued2010
dc.description.abstractIn molecular and organic electronic systems, the electrode material has considerable influence on the performance of the resulting device. The advent of scanning tunneling microscopy (STM) and its various spectroscopic extensions has allowed for exploration of the polymer-electrode interface with atomic-scale resolution. Here I present the use of STM to analyze such systems. Specifically, STM and microwave-frequency alternating current STM (ACSTM) of conducting polymers on different substrates can shed new light on how the electrode material electronically affects the adhered polymer structure. The polymers used in this work are polydiacetylene nanowires and poly(3-hexylthiophene) (P3HT) monolayer, bilayer, and thin films. For both polymers, we can use the convolution of electronic and topographic information inherent in STM topography images to extrapolate information about the electronic structure. It is also possible to acquire information about the work function, the density of states (DOS), relative energy level positions, and the differential capacitance via spectroscopic measurements. In particular, capacitance imaging requires a novel technique known as ACSTM that can be used to probe relative carrier concentration. This thesis presents analyses of PDA and P3HT on graphite and molybdenum disulfide. For P3HT thin films, gold and platinum substrates are also studied. The results indicate a strong substrate-dependent charge transfer that is further illuminated through ACSTM and other spectroscopic investigations. In this work, preliminary investigations of photovoltaic P3HT:fullerene films are also discussed.
dc.format.mimetypeapplication/pdf
dc.identifier.callnoTHESIS E.E. 2010 GIRIDHARAGOPAL
dc.identifier.citationGiridharagopal, Rajiv. "Scanning probe analysis of polydiacetylene nanowires and poly(3-hexylthiophene) thin films." (2010) Diss., Rice University. <a href="https://hdl.handle.net/1911/62150">https://hdl.handle.net/1911/62150</a>.
dc.identifier.urihttps://hdl.handle.net/1911/62150
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectElectronics
dc.subjectElectrical engineering
dc.subjectCondensed matter physics
dc.subjectMaterials science
dc.titleScanning probe analysis of polydiacetylene nanowires and poly(3-hexylthiophene) thin films
dc.typeThesis
dc.type.materialText
thesis.degree.departmentElectrical Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
3421188.PDF
Size:
3.35 MB
Format:
Adobe Portable Document Format
Download
Collections
Rice University Electronic Theses and Dissertations
ECE Theses and Dissertations