Development of organic thermoelectric materials and devices for energy harvesting

dc.contributor.advisor Yee, Shannon
dc.contributor.author Krishnakumar Menon, Akanksha
dc.contributor.committeeMember Graham, Samuel
dc.contributor.committeeMember Henry, Asegun
dc.contributor.committeeMember Reynolds, John R.
dc.contributor.committeeMember Kippelen, Bernard
dc.contributor.department Mechanical Engineering
dc.date.accessioned 2018-05-31T18:15:40Z
dc.date.available 2018-05-31T18:15:40Z
dc.date.created 2018-05
dc.date.issued 2018-04-05
dc.date.submitted May 2018
dc.date.updated 2018-05-31T18:15:40Z
dc.description.abstract Organic thermoelectrics have been limited by the lack of high performance n-type polymers and by low power outputs in existing prototype devices. To address these challenges, an n-type metallo-organic polymer was investigated and two new device architectures were proposed. Specifically, the synthesis and thermoelectric property optimization is presented for Poly(nickel-ethenetetrathiolate) or NiETT. By modifying reaction conditions and performing post-treatment by annealing, thermoelectric properties were enhanced 25x compared to literature reports for NiETT/PVDF composite films. This resulted in an n-type polymer film with a power factor over 20 µW/m-K2 that is stable in ambient conditions. As a parallel effort to developing materials, new device designs were developed that leverage the benefits of polymers, namely their low thermal conductivity and solution processability. First, a radial design based on characteristic thermal lengths for polymers is described. Analytical and numerical thermal models indicated a 10x improvement in power density for the radial thermoelectric generator (TEG) compared to conventional flat-plate TEGs. By using heat spreading, the device could operate under natural convection, thereby eliminating the need for active cooling, which reduces system cost. In the second design, a close-packed layout is presented that enables thin film TEGs with a high fill factor. By using fractal space filling curves as interconnect patterns, the TEG was divided into sub-modules for load matching to different applications, thereby eliminating the need for power conditioning circuits. These developments enable low cost thermoelectric applications for polymers such as waste heat recovery from pipes, and wearable electronics powered by body heat.
dc.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/59903
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Organic thermoelectrics
dc.subject Metallo-organic polymers
dc.subject N-type polymer
dc.subject Hilbert curves
dc.subject Radial thermoelectric
dc.subject Wearable electronics
dc.subject Interconnect patterns
dc.subject Energy harvesting
dc.subject Waste heat recovery
dc.subject Thermoelectric generator
dc.subject Conjugated polymers
dc.title Development of organic thermoelectric materials and devices for energy harvesting
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Yee, Shannon
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication de7a98b3-f8ba-4c07-b6ec-01cbefea5693
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
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