scholarly journals The effect of aromatic ring size in electron deficient semiconducting polymers for n-type organic thermoelectrics

2020 ◽  
Vol 8 (43) ◽  
pp. 15150-15157
Author(s):  
Maryam Alsufyani ◽  
Rawad K. Hallani ◽  
Suhao Wang ◽  
Mingfei Xiao ◽  
Xudong Ji ◽  
...  
Keyword(s):  
Aromatic Ring ◽  
Semiconducting Polymers ◽  
Ring Size ◽  
Thermoelectric Devices ◽  
Device Stability ◽  
Electrical Conductivities ◽  
P Type

N-type semiconducting polymers have been recently utilized in thermoelectric devices, however they have typically exhibited low electrical conductivities and poor device stability, in contrast to p-type semiconductors, which have been much higher performing.

scholarly journals Mechanosynthesis and Thermoelectric Properties of Fe, Zn, and Cd-Doped P-Type Tetrahedrite: Cu12-xMxSb4S13

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3448
Author(s):  
Francisco Arturo López Cota ◽  
José Alonso Díaz-Guillén ◽  
Oscar Juan Dura ◽  
Marco Antonio López de la Torre ◽  
Joelis Rodríguez-Hernández ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Powder Processing ◽  
High Energy ◽  
Secondary Phases ◽  
Ambient Conditions ◽  
Cadmium Sulfate ◽  
Electrical Conductivities ◽  
Compositional Changes ◽  
P Type

This contribution deals with the mechanochemical synthesis, characterization, and thermoelectric properties of tetrahedrite-based materials, Cu12-xMxSb4S13 (M = Fe2+, Zn2+, Cd2+; x = 0, 1.5, 2). High-energy mechanical milling allows obtaining pristine and substituted tetrahedrites, after short milling under ambient conditions, of stoichiometric mixtures of the corresponding commercially available binary sulfides, i.e., Cu2S, CuS, Sb2S3, and MS (M = Fe2+, Zn2+, Cd2+). All the target materials but those containing Cd were obtained as single-phase products; some admixture of a hydrated cadmium sulfate was also identified by XRD as a by-product when synthesizing Cu10Cd2Sb4S13. The as-obtained products were thermally stable when firing in argon up to a temperature of 350–400 °C. Overall, the substitution of Cu(II) by Fe(II), Zn(II), or Cd(II) reduces tetrahedrites’ thermal and electrical conductivities but increases the Seebeck coefficient. Unfortunately, the values of the thermoelectric figure of merit obtained in this study are in general lower than those found in the literature for similar samples obtained by other powder processing methods; slight compositional changes, undetected secondary phases, and/or deficient sintering might account for some of these discrepancies.

Polarity switching from p- to n-type in a single thermoelectric donor-acceptor copolymer by p-type doping

2021 ◽  
Author(s):  
Jing Wang ◽  
Yizhuo Wang ◽  
Qing Li ◽  
Zhanchao Li ◽  
Liqing Xu ◽  
...  
Keyword(s):  
Conducting Polymer ◽  
High Performance ◽  
High Current Density ◽  
Organic Polymer ◽  
Novel Approach ◽  
Polarity Switching ◽  
Electrical Conductivities ◽  
Planar Film ◽  
Donor Acceptor ◽  
P Type

Abstract The transport mechanism of organic materials is still far away from being well understood and controlled although conducting polymers have been discovered since 1977. It is rare to see conducting polyers possessing high bipolar (p- and n-type) electrical conductivities within a single bulk doped organic polymer without the assistant of gate voltage. Here, we report a novel approach to provide high performance n-type materials by p-type doping. More importantly, the bipolar electrical conductivities of the donor-acceptor conducting polymer are high, resulting high bipolar power factors among the solution-processable ambipolar D-A copolymers. A fully organic p-n junction is created in a planar film, exhibiting a high rectification ratio of 2 x 102 at +5 V with a high current density of 3 A/cm2. Structural and spectroscopic tests have been performed to provide a fundamental understanding of the polarity switching mechanism. The results open the opportunity of making p- and n-type modules with a single conducting polymer for future modern organic electronics.

Band Structures and Transport Properties of Half-Heusler Compounds NbMSb (M = Fe, Ru)

2016 ◽  
Vol 847 ◽  
pp. 171-176
Author(s):  
Teng Fang ◽  
Shu Qi Zheng ◽  
Hong Chen ◽  
Peng Zhang
Keyword(s):  
Transport Properties ◽  
Valence Band Maximum ◽  
Thermoelectric Generators ◽  
Heusler Compounds ◽  
Boltzmann Transport ◽  
Band Structures ◽  
Seebeck Coefficients ◽  
Electrical Conductivities ◽  
Scattering Time ◽  
P Type

The band structures and transport properties of Half-Heusler compounds NbFeSb and NbRuSb were studied using ab initio calculations and the Boltzmann transport equation with constant scattering time approximation (CSTA). Both compounds were identified as good p-type thermoelectric materials because of the combination of heavy and light bands in the valence band maximum (VBM). The Seebeck coefficients for NbRuSb were lower than that for NbFeSb; while the electrical conductivities for NbRuSb were little higher than that for NbFeSb. Consequently, the power factors in the p-type regimes for both compounds were similar at a given temperature. NbFeSb and NbRuSb could be efficient materials for thermoelectric generators based on the results in the present investigation.

Thermoelectric Properties of Semiconducting Polymers

2020 ◽  
Vol 50 (1) ◽  
pp. 551-574 ◽  
Author(s):  
Kelly A. Peterson ◽  
Elayne M. Thomas ◽  
Michael L. Chabinyc
Keyword(s):  
Power Generation ◽  
Electrical Conductivity ◽  
Thermoelectric Properties ◽  
Semiconducting Polymers ◽  
Solution Processing ◽  
Thermoelectric Devices ◽  
Materials Properties ◽  
Cooling Devices ◽  
Energetic Disorder ◽  
The Relationship

Semiconducting polymers have the potential to be used in thermoelectric devices that are lightweight, flexible, and fabricated using solution processing. Because of the structural and energetic disorder of these polymers, the relationship between their structure and thermoelectric properties is complex. We review how interrelated processing routes and doping methods affect the thermoelectric properties of polymers. The studies highlighted here have led to correlations between thermopower and electrical conductivity that can be described by theories under investigation. With greater understanding of the materials properties behind their performance, semiconducting polymers can be used in future power generation or cooling devices.

The Nonlinear Optical Properties of Polyacetylene within the Intermediate Exciton Formalism

1992 ◽  
Vol 247 ◽  
Author(s):  
David Yaron ◽  
Robert Silbey
Keyword(s):  
Ground State ◽  
Nonlinear Optical ◽  
Characteristic Length ◽  
Infinite Chain ◽  
Ring Size ◽  
Third Order ◽  
Nonlinear Optical Susceptibility ◽  
Optical Susceptibility ◽  
P Type ◽  
Ci Approximation

ABSTRACTWithin the Singles-CI approximation, the perturbation theory expression for γ (the non-resonant third-order nonlinear optical susceptibility) contains a class of terms which correspond to (i) the creation of an s-type exciton (ii) a transition to a p-type exciton, and (iii) a return to the ground state through an s-type exciton. The contribution of these terms to γ is considered in the limit of an infinite chain of polyacetylene. The infinite chain limit is obtained by considering a ring of polyacetylene and allowing the ring size to go to infinity. The limit is approached using three methods, each of which reveals a different characteristic length of the system. The form of the excitons is found to be independent of ring size for rings which are larger than the size of the exciton.

Highly Soluble Heteroheptacene: A New Building Block for p-Type Semiconducting Polymers

2011 ◽  
Vol 13 (2) ◽  
pp. 324-327 ◽  
Author(s):  
Qingdong Zheng ◽  
Shanci Chen ◽  
Bo Zhang ◽  
Lixin Wang ◽  
Changquan Tang ◽  
...  
Keyword(s):  
Building Block ◽  
Semiconducting Polymers ◽  
P Type

Development of aromatic ring size in bituminous coals during heat treatment in the plastic temperature range

2004 ◽  
Vol 85 (8-10) ◽  
pp. 827-835 ◽  
Author(s):  
Koh Kidena ◽  
Koji Matsumoto ◽  
Misa Katsuyama ◽  
Satoru Murata ◽  
Masakatsu Nomura
Keyword(s):  
Heat Treatment ◽  
Aromatic Ring ◽  
Ring Size ◽  
Temperature Range ◽  
Bituminous Coals
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