Enhanced thermopower in flexible tellurium nanowire films doped using single-walled carbon nanotubes with a rationally designed work function

Choi, Jinkyung; Lee, Kunsil; Park, Chong Rae; Kim, Heesuk

doi:10.1016/j.carbon.2015.07.043

Cited by 37 publications

(25 citation statements)

References 43 publications

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“…He et al demonstrated increase of the PF by 3 times for Bi 2 Te 3 –P3HT nanocomposite . Similar improvement was recorded by Choi et al for tellurium nanowire‐single wall carbon nanotube composite . Recently, Liang et al have attempted to validate this trend, and found that small (0.08 eV) and large (0.88 eV) energy barriers between the P3HT and tellurium play a significant role in charge carrier transport .…”

Section: Applications Of the Energy Filtering Effect To Different Clasupporting

confidence: 58%

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Gayner

Amouyal

2019

Adv Funct Materials

362

231

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Exhaustive attempts are made in recent decades to improve the performance of thermoelectric materials that are utilized for waste heat-to-electricity conversion. Energy filtering of charge carriers is directed toward enhancing the material thermopower. This paper focuses on the theoretical concepts, experimental evidence, and the authors' view of energy filtering in the context of thermoelectric materials. Recent studies suggest that not all materials experience this effect with the same intensity. Although this effect theoretically demonstrates improvement of the thermopower, applying it poses certain constraints, which demands further research. Predicated on data documented in literature, the unusual dependence of the thermopower and conductivity upon charge carrier concentrations can be altered through the energy filtering approach. Upon surmounting the physical constraints discussed in this article, thermoelectric materials research may gain a new direction to enhance the power factor and thermoelectric figure of merit.

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Section: Applications Of the Energy Filtering Effect To Different Clasupporting

confidence: 58%

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Gayner

Amouyal

2019

Adv Funct Materials

362

231

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“…In fact, the thermal conductivity of pristine SWCNT in this study was 0.93 W/mK, possibly because of the highly porous entangled structures . It can be concluded that the introduction of SWCNTs to the composites had no significant effect on their thermal conductivities . For the composites, the low thermal conductivity was beneficial for the thermoelectric performance of the materials.…”

Section: Resultsmentioning

confidence: 66%

Enhanced figure of merit of poly(9,9‐di‐n‐octylfluorene‐alt‐benzothiadiazole) and SWCNT thermoelectric composites by doping with FeCl₃

Zhou

Pan

Liang

et al. 2018

J of Applied Polymer Sci

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Poly(9, generally has a large Seebeck coefficient, and single-walled carbon nanotubes (SWCNTs) have high electrical conductivity. In this work, we prepared F8BT/SWCNT composites to combine the good Seebeck coefficient of the polymer and the excellent electrical conductivity of SWCNTs to achieve enhanced thermoelectric properties. For the composite materials, the maximum power factor of 1 μW mK −2 was achieved when the SWCNT content was 60%, with the maximum ZT value of 4.6 × 10 −4 . After ferric chloride was employed as the oxidative dopant for the composites, the electrical conductivity of the composites improved significantly. The maximum value of power factor (1.7 μW mK −2 ) was achieved when the SWCNT content was 60%, and the ZT value of 7.1 × 10 −4 was about 1.5 times as high as that of the composites with undoped F8BT.

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“…A similar result has been obtained in refs. for metallic single‐walled nanotubes. In our films, S > 0 (Figure ).…”

Section: Discussionmentioning

confidence: 99%

“…This fact indicates a positive sign of the carriers ( S > 0 – the hole type of carriers). An estimate of n from the thermoelectric power data at room temperature using the Drude model formula S = 8 · π 2 · k B 2 /(3 eh 2 ) · m * · T ( π /3 n ) 2/3 gives the value n ≈10 20 cm −3 , where m * ≈0.3 · m e is the effective mass of the carrier, and m e is the mass of the electron.…”

Section: Discussionmentioning

confidence: 99%

Temperature Dependence of Electrical Conductivity and Thermoelectric Power of Transparent SWCNT Films Obtained by Aerosol CVD Synthesis

Романенко

Bryantsev

Yakovleva

et al. 2018

Physica Status Solidi (b)

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The effect of pressing on temperature dependences of electrical conductivity σ(T) and thermoelectric power (Seebeck effect) S of single-walled carbon nanotubes (SWCNTs) transparent films on polyester substrate has been studied. σ(T) has been described by the fluctuation-induced tunneling model (FIT) conductance in the temperature range 20-298 K. At a temperature T < 20 K, three-dimensional variable range hopping conductivity (VRHC) has been observed. Based on the estimation of current concentration n %10 20 cm À3 from VRHC dependence, it has been found that metallic SWCNTs have made the main contribution to conductivity at T < 20 K. The value n obtained from S has been similar to the value obtained from VRHC estimation. The energy barrier between SWCNTs has been changed by pressing of films. Such pressing has led to increase in the electrical conductivity of the film by two orders of magnitude at room temperature. The measurement of conductivity in the process of synthesis has allowed us to control the repeatability of results and select samples with the necessary resistance values. Raman and optical spectroscopy, SEM and TEM have been used to determine the structural and geometric characteristics of the SWCNTs.

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Enhanced thermopower in flexible tellurium nanowire films doped using single-walled carbon nanotubes with a rationally designed work function

Cited by 37 publications

References 43 publications

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Enhanced figure of merit of poly(9,9‐di‐n‐octylfluorene‐alt‐benzothiadiazole) and SWCNT thermoelectric composites by doping with FeCl₃

Temperature Dependence of Electrical Conductivity and Thermoelectric Power of Transparent SWCNT Films Obtained by Aerosol CVD Synthesis

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Enhanced thermopower in flexible tellurium nanowire films doped using single-walled carbon nanotubes with a rationally designed work function

Cited by 37 publications

References 43 publications

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Energy Filtering of Charge Carriers: Current Trends, Challenges, and Prospects for Thermoelectric Materials

Enhanced figure of merit of poly(9,9‐di‐n‐octylfluorene‐alt‐benzothiadiazole) and SWCNT thermoelectric composites by doping with FeCl3

Temperature Dependence of Electrical Conductivity and Thermoelectric Power of Transparent SWCNT Films Obtained by Aerosol CVD Synthesis

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Enhanced figure of merit of poly(9,9‐di‐n‐octylfluorene‐alt‐benzothiadiazole) and SWCNT thermoelectric composites by doping with FeCl₃