Show simple item record

dc.creatorLombardo, Christopher Joseph
dc.date.accessioned2011-07-06T18:47:36Z
dc.date.available2011-07-06T18:47:36Z
dc.date.created2011-05
dc.date.issued2011-07-06
dc.date.submittedMay 2011
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2011-05-2927
dc.descriptiontext
dc.description.abstractFor more than 20 years, scientists have studied solar cells made from organic semiconductors. Throughout this time, device structures have evolved from bilayer devices to bulk heterojunction (BHJ) devices and even though efficiencies are approaching 10%, scientists still know relatively little about the transport of charge carriers and recombination mechanisms in these materials. Novel structures, based on lateral BHJ solar cells, have proven to be versatile tools to study transport and recombination mechanisms. In addition, these structures can easily be employed by researchers and solar cell manufacturers to determine the quality and measure the improvement of their materials. For these studies, poly(3-hexylthiophene) (P3HT):[6,6]-phenyl C61-butyric acid methyl ester (PCBM) has been employed due to its wide use among researchers as well as potential for commercialization. DC photocurrent measurements as a function of device length have yielded the mobility-lifetime product and the generation rate of free carriers within these BHJ devices. In addition to these parameters, the recombination rate as a function of light intensity provides information about the mechanisms of recombination. For example, by measuring the recombination rate as a function of applied electric field and light intensity we have found that recombination is unimolecular in nature and shifts to bimolecular at increased electric field strengths. Additionally, the mobility-lifetime product, generation rate, and recombination mechanism have been studied as a function of applied electric field, illumination spectrum, illumination intensity, etc. This information has provided much insight on physics of the P3HT:PCBM material system which did not exist before these studies.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.subjectSolid state electronics
dc.subjectThin films
dc.subjectSolar cells
dc.subjectCharge transport
dc.subjectP3HT:PCBM
dc.subjectOrganic semiconductor
dc.subjectBulk heterojunction
dc.titleDevelopment of new experimental techniques for studying transport and recombination in organic and inorganic thin film solar cells
dc.date.updated2011-07-06T18:48:03Z
dc.identifier.slug2152/ETD-UT-2011-05-2927
dc.description.departmentElectrical and Computer Engineering
dc.type.genrethesis*
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.disciplineElectrical and Computer Engineering
thesis.degree.grantorUniversity of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy


Files in this item

Icon

This item appears in the following Collection(s)

Show simple item record