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Ming Liu - One of the best experts on this subject based on the ideXlab platform.
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CHAPTER 2:Thermoelectric Transport Theory in Organic Semiconductors
Energy and Environment Series, 2019Co-Authors: Ming LiuAbstract:The thermoelectric effect is hopefully a technique that can convert heat from the sun, industrial sectors and automobile exhausts to power energy. Due to current issues on energy production and the environment, the thermoelectric effect has recently become the subject of growing interest. Organic Semiconductors are one kind of excellent material which exhibit the various thermoelectric characteristics based on the complexity of molecule structures with the relatively low thermal conductivities demanded for high thermoelectric performance. In this chapter, we will systemically describe the thermoelectric transport theory of Organic Semiconductors in detail. In Section 2.1, we will introduce the development of Organic Semiconductors, the transport mechanism of Organic Semiconductors, and the concept of the thermoelectric transport effect. In Section 2.2, the basic thermoelectric transport equations will be discussed, including the Boltzmann transport equation, Mott's expression and the general expression of the Seebeck effect. In Section 2.3, based on first-principles theory, the hopping transport theory, the percolation theory, the hybrid theory, the thermoelectric transport characteristics will be discussed in detail, respectively. In Section 2.4, based on Monte Carlo simulation, comparisons between the numeric and the analytical results of the Seebeck effect will be discussed. Finally, the future outlook of thermoelectric transport theory is briefly discussed in Section 2.5.
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understanding electrical thermal transport characteristics of Organic Semiconductors violation of wiedemann franz law
Journal of Applied Physics, 2016Co-Authors: Ming Liu, Nan GaoAbstract:Organic Semiconductors exhibit plenty of attractive properties for use as thermoelectric elements. A comprehensive understanding for the electrical-thermal transport characteristics is crucial to design and fabricate the thermoelectric device. We proposed a theoretical model to investigate the electrical conductivity and the electronic thermal conductivity of Organic Semiconductors based on the hopping transport mechanism. The electrical-thermal transport characteristics of Organic Semiconductors have been analyzed in detail and compared with the experimental results and Monte Carlo simulation. The Wiedemann-Franz law, connecting the electronic thermal conductivity to the electrical conductivity of Organic Semiconductors, is generally found to be strongly violated under the effect of temperature, carrier concentration, energetic disorder and electric field.
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A review of carrier thermoelectric-transport theory in Organic Semiconductors
Physical chemistry chemical physics : PCCP, 2016Co-Authors: Ming LiuAbstract:Carrier thermoelectric-transport theory has recently become of growing interest and numerous thermoelectric-transport models have been proposed for Organic Semiconductors, due to pressing current issues involving energy production and the environment. The purpose of this review is to provide a theoretical description of the thermoelectric Seebeck effect in Organic Semiconductors. Special attention is devoted to the carrier concentration, temperature, polaron effect and dipole effect dependence of the Seebeck effect and its relationship to hopping transport theory. Furthermore, various theoretical methods are used to discuss carrier thermoelectric transport. Finally, an outlook of the remaining challenges ahead for future theoretical research is provided.
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Polaron effect dependence of thermopower in Organic Semiconductors
Physics Letters A, 2014Co-Authors: Jiebin Niu, Ming LiuAbstract:Abstract A unified physical model for thermopower was presented in Organic Semiconductors, based on the Marcus theory and variable-range hopping theory. According to the proposed model, the characteristic of charge carrier thermoelectric transport in Organic Semiconductors has been investigated. In particular, polaron effects, energetic disorder, and carrier density dependence of the thermopower have been discussed in detailed. The calculation also shows a good agreement with the experimental data in Organic Semiconductors.
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Universal Einstein Relation Model in Disordered Organic Semiconductors under Quasi-equilibrium
arXiv: Disordered Systems and Neural Networks, 2013Co-Authors: Ming LiuAbstract:It is still under debate whether the classical Einstein relation in disordered Organic Semiconductors is valid. We investigated Einstein relation in disordered Organic Semiconductors theoretically. The results show that, the classic Einstein relation deviate dramatically with disorder and electric field, even in the case of thermal equilibrium.
Turan Ozturk - One of the best experts on this subject based on the ideXlab platform.
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Thiophene-Based Organic Semiconductors
Topics in Current Chemistry, 2017Co-Authors: Gulsen Turkoglu, M. Emin Cinar, Turan OzturkAbstract:Thiophene-based π-conjugated Organic small molecules and polymers are the research subject of significant current interest owing to their potential use as Organic Semiconductors in material chemistry. Despite simple and similar molecular structures, the hitherto reported properties of thiophene-based Organic Semiconductors are rather diverse. Design of high performance Organic semiconducting materials requires a thorough understanding of inter- and intra-molecular interactions, solid-state packing, and the influence of both factors on the charge carrier transport. In this chapter, thiophene-based Organic Semiconductors, which are classified in terms of their chemical structures and their structure–property relationships, are addressed for the potential applications as Organic photovoltaics (OPVs), Organic field-effect transistors (OFETs) and Organic light emitting diodes (OLEDs).
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Thiophene-Based Organic Semiconductors
Topics in Current Chemistry, 2017Co-Authors: Gulsen Turkoglu, M. Emin Cinar, Turan OzturkAbstract:Thiophene-based π-conjugated Organic small molecules and polymers are the research subject of significant current interest owing to their potential use as Organic Semiconductors in material chemistry. Despite simple and similar molecular structures, the hitherto reported properties of thiophene-based Organic Semiconductors are rather diverse. Design of high performance Organic semiconducting materials requires a thorough understanding of inter- and intra-molecular interactions, solid-state packing, and the influence of both factors on the charge carrier transport. In this chapter, thiophene-based Organic Semiconductors, which are classified in terms of their chemical structures and their structure–property relationships, are addressed for the potential applications as Organic photovoltaics (OPVs), Organic field-effect transistors (OFETs) and Organic light emitting diodes (OLEDs).
Gulsen Turkoglu - One of the best experts on this subject based on the ideXlab platform.
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Thiophene-Based Organic Semiconductors
Topics in Current Chemistry, 2017Co-Authors: Gulsen Turkoglu, M. Emin Cinar, Turan OzturkAbstract:Thiophene-based π-conjugated Organic small molecules and polymers are the research subject of significant current interest owing to their potential use as Organic Semiconductors in material chemistry. Despite simple and similar molecular structures, the hitherto reported properties of thiophene-based Organic Semiconductors are rather diverse. Design of high performance Organic semiconducting materials requires a thorough understanding of inter- and intra-molecular interactions, solid-state packing, and the influence of both factors on the charge carrier transport. In this chapter, thiophene-based Organic Semiconductors, which are classified in terms of their chemical structures and their structure–property relationships, are addressed for the potential applications as Organic photovoltaics (OPVs), Organic field-effect transistors (OFETs) and Organic light emitting diodes (OLEDs).
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Thiophene-Based Organic Semiconductors
Topics in Current Chemistry, 2017Co-Authors: Gulsen Turkoglu, M. Emin Cinar, Turan OzturkAbstract:Thiophene-based π-conjugated Organic small molecules and polymers are the research subject of significant current interest owing to their potential use as Organic Semiconductors in material chemistry. Despite simple and similar molecular structures, the hitherto reported properties of thiophene-based Organic Semiconductors are rather diverse. Design of high performance Organic semiconducting materials requires a thorough understanding of inter- and intra-molecular interactions, solid-state packing, and the influence of both factors on the charge carrier transport. In this chapter, thiophene-based Organic Semiconductors, which are classified in terms of their chemical structures and their structure–property relationships, are addressed for the potential applications as Organic photovoltaics (OPVs), Organic field-effect transistors (OFETs) and Organic light emitting diodes (OLEDs).
Eigo Miyazaki - One of the best experts on this subject based on the ideXlab platform.
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thienoacene based Organic Semiconductors
Advanced Materials, 2011Co-Authors: Kazuo Takimiya, Shoji Shinamura, Itaru Osaka, Eigo MiyazakiAbstract:Thienoacenes consist of fused thiophene rings in a ladder-type molecular structure and have been intensively studied as potential Organic Semiconductors for Organic field-effect transistors (OFETs) in the last decade. They are reviewed here. Despite their simple and similar molecular structures, the hitherto reported properties of thienoacene-based OFETs are rather diverse. This Review focuses on four classes of thienoacenes, which are classified in terms of their chemical structures, and elucidates the molecular electronic structure of each class. The packing structures of thienoacenes and the thus-estimated solid-state electronic structures are correlated to their carrier transport properties in OFET devices. With this perspective of the molecular structures of thienoacenes and their carrier transport properties in OFET devices, the structure-property relationships in thienoacene-based Organic Semiconductors are discussed. The discussion provides insight into new molecular design strategies for the development of superior Organic Semiconductors.
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Thienoacene‐Based Organic Semiconductors
Advanced materials (Deerfield Beach Fla.), 2011Co-Authors: Kazuo Takimiya, Shoji Shinamura, Itaru Osaka, Eigo MiyazakiAbstract:Thienoacenes consist of fused thiophene rings in a ladder-type molecular structure and have been intensively studied as potential Organic Semiconductors for Organic field-effect transistors (OFETs) in the last decade. They are reviewed here. Despite their simple and similar molecular structures, the hitherto reported properties of thienoacene-based OFETs are rather diverse. This Review focuses on four classes of thienoacenes, which are classified in terms of their chemical structures, and elucidates the molecular electronic structure of each class. The packing structures of thienoacenes and the thus-estimated solid-state electronic structures are correlated to their carrier transport properties in OFET devices. With this perspective of the molecular structures of thienoacenes and their carrier transport properties in OFET devices, the structure–property relationships in thienoacene-based Organic Semiconductors are discussed. The discussion provides insight into new molecular design strategies for the development of superior Organic Semiconductors.
Jinliang Wang - One of the best experts on this subject based on the ideXlab platform.
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recent progress in the development of n type Organic Semiconductors for Organic field effect transistors
Journal of Materials Chemistry C, 2017Co-Authors: Jesse Quinn, Xu Li, Jinliang Wang, Yuning LiAbstract:This review highlights recent major progress in the development of Organic Semiconductors as electron transport n-channel materials in Organic field effect transistors (OFETs). Three types of materials are discussed: (1) small molecules, (2) polymers, and (3) n-doped small molecules and polymers. Much effort has been made in the modification of known building blocks, development of novel building blocks, and optimization of materials processing and device structures. These efforts have resulted in the achievement of record high electron mobilities for both small molecules (12.6 cm2 V−1 s−1) and polymers (14.9 cm2 V−1 s−1), which are approaching the highest hole mobilities achieved by p-type small molecules and polymers so far. In addition, n-doping of ambipolar and p-type Organic Semiconductors has proven to be an efficient approach to obtaining a greater number of n-type Organic Semiconductors. However, it is found that n-type Organic Semiconductors, in general, still lag behind p-type Organic Semiconductors in terms of carrier mobility and air stability. Further exploration of new building blocks for making novel materials and optimization of processing conditions and device structures are needed to improve the performance, particularly air stability.
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recent progress in the development of n type Organic Semiconductors for Organic field effect transistors
Journal of Materials Chemistry C, 2017Co-Authors: Jesse Quinn, Jiaxin Zhu, Jinliang WangAbstract:This review highlights recent major progress in the development of Organic Semiconductors as electron transport n-channel materials in Organic field effect transistors (OFETs). Three types of materials are discussed: (1) small molecules, (2) polymers, and (3) n-doped small molecules and polymers. Much effort has been made in the modification of known building blocks, development of novel building blocks, and optimization of materials processing and device structures. These efforts have resulted in the achievement of record high electron mobilities for both small molecules (12.6 cm2 V−1 s−1) and polymers (14.9 cm2 V−1 s−1), which are approaching the highest hole mobilities achieved by p-type small molecules and polymers so far. In addition, n-doping of ambipolar and p-type Organic Semiconductors has proven to be an efficient approach to obtaining a greater number of n-type Organic Semiconductors. However, it is found that n-type Organic Semiconductors, in general, still lag behind p-type Organic Semiconductors in terms of carrier mobility and air stability. Further exploration of new building blocks for making novel materials and optimization of processing conditions and device structures are needed to improve the performance, particularly air stability.