Measuring Seebeck coefficients on high resistivity polymers

Ranicar, J. H.; Fleming, R.J.

doi:10.1088/0022-3727/3/12/431

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…The thermoelectric voltages of both samples coincide. The Seebeck coefficient S and the energy barrier height W 0 can be specified for an absolute temperature of T 1 = 303 K with equations ( 12) and ( 13): S = 2.99 mV K −1 | 303 K W 0 = 0.9 eV| 303 K Chien et al [8] found S = 1.45±0.15 mV K −1 in polyacetylene and Ranicar et al [3] measured S = 1.5 ± 0.2 mV K −1 in 10 15 20 25 polyvinylchloride. These values are significantly lower than our thermovoltage.…”

Section: Resultsmentioning

confidence: 99%

“…Further, the thermoelectric power coefficient or Seebeck coefficient S can be calculated [3][4][5][6][7][8][9]:…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Charges move from the warmer to the colder side of the sample causing a thermoelectric voltage. The direction of the voltage is determined by the positive or negative charge of the moving ions [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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A thermoelectric voltage effect in polyethylene oxide

Martin¹,

Wagner²,

Kliem³

2003

J. Phys. D: Appl. Phys.

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The conductivity of polyethylene oxide (PEO) is described with a three-dimensional hopping model considering electrostatic interactions between the ions. Ions fluctuate over energy-barriers in a multi-well potential. To decide whether positive or negative charges are responsible for this conductivity, the thermoelectric voltage is measured. The samples are embedded between two aluminium-electrodes. The oxide on the interface between the electrodes and the PEO serves as a blocking layer. The temperature of each electrode is controlled by a Peltier element. A temperature step is applied to one electrode by changing the temperature of one of the Peltier elements. Due to this temperature gradient, the mobile charges fluctuate thermally activated from the warmer side to the colder side of the sample. The direction of the measured thermoelectric voltage indicates the type of mobile charges. It is found that positive charges are mobile. Further, it is shown that the absolute value of the thermoelectric voltage depends on the energy-barrier heights in the multi-well potential.

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Section: Resultsmentioning

confidence: 99%

“…Further, the thermoelectric power coefficient or Seebeck coefficient S can be calculated [3][4][5][6][7][8][9]:…”

Section: Theoretical Modelmentioning

confidence: 99%

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A thermoelectric voltage effect in polyethylene oxide

Martin¹,

Wagner²,

Kliem³

2003

J. Phys. D: Appl. Phys.

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An automatic system for determining Seebeck coefficients of polymeric fibers and films

Grady

Hersh

1975

Review of Scientific Instruments

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An apparatus is described which greatly facilitates the measurement of Seebeck coefficients on materials with low electrical conductivity for use in charge transport studies. A temperature programmer is included in the system and data are recorded automatically, thereby eliminating the need for manual measurements. Special instruments and connections are used to reduce leakage of the thermally generated Seebeck voltage. The apparatus has been especially designed for polymeric films and fibers and a simple and inexpensive method for mounting and testing fiber specimens has been developed. The various types of Seebeck experiments that can be performed with this system and the problems encountered with low conductivity samples are described.

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