Content of TOPICAL REVIEW—Organic and hybrid thermoelectrics in our journal

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    Thermoelectric transport in conductive poly(3,4-ethylenedioxythiophene)
    Meng Li(李萌), Zuzhi Bai(柏祖志), Xiao Chen(陈晓), Cong-Cong Liu(刘聪聪), Jing-Kun Xu(徐景坤), Xiao-Qi Lan(蓝小琪), and Feng-Xing Jiang(蒋丰兴)
    Chin. Phys. B, 2022, 31 (2): 027201.   DOI: 10.1088/1674-1056/ac4230
    Abstract419)   HTML7)    PDF (3804KB)(213)      
    Poly(3,4-ethylenedioxythiophene) (PEDOT) has proved its quite competitive thermoelectric properties in flexible electronics with its excellent electrical and mechanical properties. Since the early discovery of PEDOT, considerable experimental progress has been achieved in optimizing and improving the thermoelectric properties as a promising organic thermoelectric material (OTE). Among them, theoretical research has made significant contributions to its development. Here the basic physics of conductive PEDOT are reviewed based on the combination of theory and experiment. The purpose is to provide a new insight into the development of PEDOT, so as to effectively design and preparation of advanced thermoelectric PEDOT material in the future.
    Recent advances in organic, inorganic, and hybrid thermoelectric aerogels
    Lirong Liang(梁丽荣), Xiaodong Wang(王晓东), Zhuoxin Liu(刘卓鑫), Guoxing Sun(孙国星), and Guangming Chen(陈光明)
    Chin. Phys. B, 2022, 31 (2): 027903.   DOI: 10.1088/1674-1056/ac2802
    Abstract447)   HTML7)    PDF (2370KB)(219)      
    The thermoelectric (TE) materials and corresponding TE devices can achieve direct heat-to-electricity conversion, thus have wide applications in heat energy harvesting (power generator), wearable electronics and local cooling. In recent years, aerogel-based TE materials have received considerable attention and have made remarkable progress because of their unique structural, electrical and thermal properties. In this review, the recent progress in both organic, inorganic, and composite/hybrid TE aerogels is systematically summarized, including the main constituents, preparation method, TE performance, as well as factors affecting the TE performance and the corresponding mechanism. Moreover, two typical aerogel-based TE devices/generators are compared and analyzed in terms of assembly modes and output performance. Finally, the present challenges and some tentative suggestions for future research prospects are provided in conclusion.
    Recent progress in design of conductive polymers to improve the thermoelectric performance
    Zhen Xu (徐真), Hui Li (李慧), and Lidong Chen(陈立东)
    Chin. Phys. B, 2022, 31 (2): 028203.   DOI: 10.1088/1674-1056/ac22a4
    Abstract371)   HTML6)    PDF (4924KB)(244)      
    Organic semiconductors, especially polymer semiconductors, have attracted extensive attention as organic thermoelectric materials due to their capabilities for flexibility, low-cost fabrication, solution processability and low thermal conductivity. However, it is challenging to obtain high-performance organic thermoelectric materials because of the low intrinsic carrier concentration of organic semiconductors. The main method to control the carrier concentration of polymers is the chemical doping process by charge transfer between polymer and dopant. Therefore, the deep understanding of doping mechanisms from the point view of chemical structure has been highly desired to overcome the bottlenecks in polymeric thermoelectrics. In this contribution, we will briefly review the recently emerging progress for discovering the structure-property relationship of organic thermoelectric materials with high performance. Highlights include some achievements about doping strategies to effectively modulate the carrier concentration, the design rules of building blocks and side chains to enhance charge transport and improve the doping efficiency. Finally, we will give our viewpoints on the challenges and opportunities in the field of polymer thermoelectric materials.
    Structure design for high performance n-type polymer thermoelectric materials
    Qi Zhang(张奇), Hengda Sun(孙恒达), and Meifang Zhu(朱美芳)
    Chin. Phys. B, 2022, 31 (2): 028506.   DOI: 10.1088/1674-1056/ac3a64
    Abstract351)   HTML2)    PDF (3007KB)(177)      
    Organic thermoelectric (OTE) materials have been regarded as a potential candidate to harvest waste heat from complex, low temperature surfaces of objects and convert it into electricity. Recently, n-type conjugated polymers as organic thermoelectric materials have aroused intensive research in order to improve their performance to match up with their p-type counterpart. In this review, we discuss aspects that affect the performance of n-type OTEs, and further focus on the effect of planarity of backbone on the doping efficiency and eventually the TE performance. We then summarize strategies such as implementing rigid n-type polymer backbone or modifying conventional polymer building blocks for more planar conformation. In the outlook part, we conclude forementioned devotions and point out new possibility that may promote the future development of this field.
ISSN 1674-1056   CN 11-5639/O4

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