Interface Studies of Small-Molecule Organic Photovoltaics; Surface Modifications, Electron Donor Texturing, and Co-Facial Variations at the Donor/Acceptor Heterojunctions

Persistent Link:
http://hdl.handle.net/10150/202936
Title:
Interface Studies of Small-Molecule Organic Photovoltaics; Surface Modifications, Electron Donor Texturing, and Co-Facial Variations at the Donor/Acceptor Heterojunctions
Author:
Placencia, Diogenes
Issue Date:
2011
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The role of the oxide/organic and organic/organic interfaces in small-molecule planar-Heterojunction (PHJ) photovoltaics was investigated with three interrelated projects: i) indium-tin oxide (ITO) bottom contact electrodes were modified with gold nanoparticles (Au-NPs) to improve rates of charge-transfer at the donor/oxide interface, ii) donor layers in OPVs were textured to increase charge generation at the organic/organic' interface, and iii) the effect of co-facial overlap on device performance via tuning of the electron acceptor orientation at the organic/organic interface. The modification of ITO with Au-NPs showed increased performance in small-molecule OPVs when compared to non-processed ITO devices due to the interactions between the Au-NPs and the donor material. Textured TiOPc increased overall device performance by a factor of 2X via the increased surface area, near-IR absorption, and increased mobilities. Modified and un-modified PTCDA acceptors showed that co-facial overlap at the organic/organic' interface is a large determinant in device performance, while the performance in small-molecule planar-heterojunction photovoltaics were severely affected by the pre-treatment process, most likely due to the particular interactions between the oxide and the donor material.
Type:
text; Electronic Dissertation
Keywords:
phthalocyanine; titanyl phthalocyanine; Chemistry; gold nanoparticles; photovoltaics
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Chemistry
Degree Grantor:
University of Arizona
Advisor:
Armstrong, Neal R.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleInterface Studies of Small-Molecule Organic Photovoltaics; Surface Modifications, Electron Donor Texturing, and Co-Facial Variations at the Donor/Acceptor Heterojunctionsen_US
dc.creatorPlacencia, Diogenesen_US
dc.contributor.authorPlacencia, Diogenesen_US
dc.date.issued2011-
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe role of the oxide/organic and organic/organic interfaces in small-molecule planar-Heterojunction (PHJ) photovoltaics was investigated with three interrelated projects: i) indium-tin oxide (ITO) bottom contact electrodes were modified with gold nanoparticles (Au-NPs) to improve rates of charge-transfer at the donor/oxide interface, ii) donor layers in OPVs were textured to increase charge generation at the organic/organic' interface, and iii) the effect of co-facial overlap on device performance via tuning of the electron acceptor orientation at the organic/organic interface. The modification of ITO with Au-NPs showed increased performance in small-molecule OPVs when compared to non-processed ITO devices due to the interactions between the Au-NPs and the donor material. Textured TiOPc increased overall device performance by a factor of 2X via the increased surface area, near-IR absorption, and increased mobilities. Modified and un-modified PTCDA acceptors showed that co-facial overlap at the organic/organic' interface is a large determinant in device performance, while the performance in small-molecule planar-heterojunction photovoltaics were severely affected by the pre-treatment process, most likely due to the particular interactions between the oxide and the donor material.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectphthalocyanineen_US
dc.subjecttitanyl phthalocyanineen_US
dc.subjectChemistryen_US
dc.subjectgold nanoparticlesen_US
dc.subjectphotovoltaicsen_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineChemistryen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorArmstrong, Neal R.en_US
dc.contributor.committeememberPemberton, Jeanneen_US
dc.contributor.committeememberMonti, Oliver L.en_US
dc.contributor.committeememberLoy, Douglas A.en_US
dc.contributor.committeememberSaavedra, S. Scotten_US
dc.contributor.committeememberArmstrong, Neal R.en_US
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