Development of new experimental techniques for studying transport and recombination in organic and inorganic thin film solar cells

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Development of new experimental techniques for studying transport and recombination in organic and inorganic thin film solar cells

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dc.contributor.advisor Dodabalapur, Ananth, 1963-
dc.creator Lombardo, Christopher Joseph
dc.date.accessioned 2011-07-06T18:47:36Z
dc.date.available 2011-07-06T18:47:36Z
dc.date.created 2011-05
dc.date.issued 2011-07-06
dc.date.submitted May 2011
dc.identifier.uri http://hdl.handle.net/2152/ETD-UT-2011-05-2927
dc.description.abstract For 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.mimetype application/pdf
dc.language.iso eng
dc.subject Solid state electronics
dc.subject Thin films
dc.subject Solar cells
dc.subject Charge transport
dc.subject P3HT:PCBM
dc.subject Organic semiconductor
dc.subject Bulk heterojunction
dc.title Development of new experimental techniques for studying transport and recombination in organic and inorganic thin film solar cells
dc.date.updated 2011-07-06T18:48:03Z
dc.identifier.slug 2152/ETD-UT-2011-05-2927
dc.contributor.committeeMember Banerjee, Sanjay
dc.contributor.committeeMember Bank, Seth
dc.contributor.committeeMember Korgel, Brian
dc.contributor.committeeMember Tutuc, Emanuel
dc.contributor.committeeMember Yu, Edward
dc.description.department Electrical and Computer Engineering
dc.type.genre thesis
dc.type.material text
thesis.degree.department Electrical and Computer Engineering
thesis.degree.discipline Electrical and Computer Engineering
thesis.degree.grantor University of Texas at Austin
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy

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