Thin-Film Thermal-Conductivity Measurement on Semi-Conducting Polymer Material Using the 3ω Technique

Rausch, Stefan; Rauh, Daniel; Deibel, Carsten; Vidi, S.; Ebert, Hans-Peter

doi:10.1007/s10765-012-1174-4

Cited by 18 publications

(17 citation statements)

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“…[6][7][8][9][10] In addition, organic polymers have very recently received attention as plausible thermoelectric materials, [11][12][13] stemming from the fact that they are both semiconducting and that they should exhibit relatively low thermal conductivities, i.e., disordered polymeric chains often exhibit thermal conductivities an order of magnitude smaller than that of silica glass. [13][14][15][16][17][18][19] Regardless of application, adequate thermal characterization of these materials is critical, whether it be to properly account for the I 2 R losses in photovoltaic configurations 6,9 or maximize the figure of merit in thermoelectric applications. 20,21 Thermal characterization of polymeric thin films is often a non-trivial task due to the fact the polymer thermal properties are very sensitive to the arrangement of the molecules within.…”

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confidence: 99%

Thermal transport in organic semiconducting polymers

et al. 2013

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We report on the thermal conductivities of poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate), [6,6]-phenyl C 61-butyric acid methyl ester (PCBM), poly(3-hexylthiophene-2,5-diyl) (P3HT), and P3HT:PCBM blend thin films as measured by time domain thermoreflectance. Thermal conductivities vary from 0:031 6 0:005 to 0:227 6 0:014 W m À1 K À1 near room temperature and exhibit minimal temperature dependence across the range from 319 to 396 K. Thermal conductivities of blend films follow a rule of mixtures, and no percolation threshold is found. Thermal annealing of blend films has a variable effect on thermal conductivity. Finally, the thermal conductivities of P3HT films do not vary with changes in film thickness from 77 to 200 nm. V

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confidence: 99%

Thermal transport in organic semiconducting polymers

et al. 2013

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“…The 3u-SThM has been used to determine the thermal conductivity of organic and inorganic nanostructures, such as lms 29,30 or nanowires. 28,31 This technique uses a thermoresistive probe that is heated by Joule effect when passing an electrical current through it.…”

Section: Physical Properties Characterizationmentioning

confidence: 99%

Enhancement of thermoelectric efficiency of doped PCDTBT polymer films

et al. 2015

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Conjugated polymers may be used as thermoelectric materials due to their low thermal conductivity and have the advantageous characteristics of conventional polymers, such as low weight, non-toxicity and low cost. Here, a detailed investigation into the thermoelectric properties of PCDTBT films is reported.Moreover, in order to improve the thermoelectric properties of this polymer, FeCl 3 is used as a doping agent. For the most optimally doped film reported in this work, a power factor value of 24 mW m À1 K À2 is obtained at 150 C. The different films were characterized by wide-angle X-ray scattering (WAXS) experiments at different temperatures. In order to see the temperature effect, the thermoelectric power factor is measured as a function of temperature from (from RT to 150 C). Thermal conductivity at room temperature is calculated with two independent methods which give values in agreement within the margin of uncertainty. The results obtained show promise and give insight to motivate future investigation into these types of carbazole derivates.

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“…[74,89]). Also in Figure 4.1, we report data on PCBM films with different thicknesses and processing conditions than those reported in Ref.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal characteristics of polymeric thin films are very sensitive to the arrangement of the molecular chains. For example, well-aligned polymeric chains can exhibit exceptionally high thermal conductivities [75], in stark contrast with the disordered polymeric chains described above [69][70][71][72][73][74]. In disordered polymeric films, thermal conductivities exhibit temperature-dependence that are typical of amorphous solids, and heat transfer is limited by a random walk of localized energy on the time and length scales of atomic vibrations and interatomic spacing, respectively [76][77][78].…”

Section: Introductionmentioning

confidence: 98%

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Investigation of Electrical Properties of P3HT:PCPBM Organic Solar Cells

Shen

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The electrical properties of organic solar cells (OSC) have been investigated to understand the charge loss mechanisms impacting the over all efficiency. The power conversion efficiency of a solar cell is dependent upon the short-circuit current density (J SC ), open circuit voltage (V OC ) and the fill factor (FF). This thesis is mainly about the investigation of these properties in two aspects: the current conducting mechanism is studied via electrical resistance measurements of the OSC devices and the origin of V OC is investigated through the fundamental studies using ultraviolet photoelectron spectroscopy (UPS).In the current conducting mechanism study, the series resistance of poly (3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCB-M) bulk heterojunction (BHJ) organic solar cells (OSC) has been investigated. The bulk resistance of the active layer and the specific contact resistance between the active layer and the electrode are extracted from the measured series resistance using the vertical transmission line model (TLM) method. Results have shown that for an annealed P3HT:PCBM device which has an active layer thickness of 85 nm (optimum thickness for high efficiency), 17% of the total series resistance is attributed to contact resistance and bulk resistance contributed the rest 83%. Thermal annealing helps to reduce the contact resistance by a factor of 2 and the bulk resistance by a factor of 8. The resistances of pure PCBM devices increase linearly with thickness, while the increasing trend of the pure P3HT devices can be described as two different increasing regions, mainly due to the recombination effect.The origin of V OC is investigated through UPS study. V OC of P3HT and PCBM organic solar cell devices is measured at temperatures ranging from 15• C to 145

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Thin-Film Thermal-Conductivity Measurement on Semi-Conducting Polymer Material Using the 3ω Technique

Cited by 18 publications

References 10 publications

Thermal transport in organic semiconducting polymers

Thermal transport in organic semiconducting polymers

Enhancement of thermoelectric efficiency of doped PCDTBT polymer films

Investigation of Electrical Properties of P3HT:PCPBM Organic Solar Cells

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