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题名: Seebeck Effects in N-Type and P-Type Polymers Driven Simultaneously by Surface Polarization and Entropy Differences Based on Conductor/Polymer/Conductor Thin-Film Devices
作者: Hu, Dehua2;  Liu, Qing2;  Tisdale, Jeremy2;  Lei, Ting3;  Pei, Jian3;  Wang, Hsin4;  Urbas, Augustine5;  Hu, Bin1, 2
关键词: Seebeck effects ;  charge-transfer states ;  surface polarization ;  entropy difference ;  n-type organic polymer ;  p-type organic polymer
刊名: ACS NANO
发表日期: 2015-05-01
DOI: 10.1021/acsnano.5b00589
卷: 9, 期:5, 页:5208-5213
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: This paper reports Seebeck effects driven by both surface polarization difference and entropy difference by using photoinduced intramolecular charge-transfer states in n-type and p-type conjugated polymers, namely IIDT and IIDDT, respectively, based on vertical conductor/polymer/conductor thin-film devices. We obtain large Seebeck coefficients of 898 mu V/K from n-type IIDT and 1300 mu V/K from p-type IIDDT when the charge-transfer states are generated by a white light illumination of 100 mW/cm(2), compared with the values of 380 and 4700 mu V/K in dark condition, respectively. Simultaneously, the electrical conductivities are increased from almost insulating state in dark condition to conducting state under photoexcitation in both n-type IIDT and p-type IIDDT based devices. The large Seebeck effects can be attributed to the following two mechanisms. First, the intramolecular charge-transfer states exhibit strong electron phonon coupling, which leads to a polarization difference between high and low temperature surfaces. This polarization difference essentially forms a temperature-dependent electric field, functioning as a new driving force additional to entropy difference, to drive the energetic carriers for the development of Seebeck effects under a temperature difference. Second, the intramolecular charge-transfer states generate negative or positive majority carriers (electrons or holes) in the n-type IIDT or p-type IIDDT, ready to be driven between high and low temperature surfaces for developing Seebeck effects. On the basis of coexisted polarization difference and entropy difference, the intramolecular charge-transfer states can largely enhance the Seebeck effects in both n-type IIDT and p-type IIDDT devices. Furthermore, we find that changing electrical conductivity can switch the Seebeck effects between polarization and entropy regimes when the charge-transfer states are generated upon applying photoexcitation. Therefore, using intramolecular charge-transfer states presents an approach to develop thermoelectric effects in organic materials-based vertical conductor/polymer/conductor thin-film devices.
关键词[WOS]: ENHANCEMENT ;  DENSITY ;  VOLTAGE ;  STATES
语种: 英语
WOS记录号: WOS:000355383000056
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146291
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Beijing Jiaotong Univ, Coll Sci, Beijing 100044, Peoples R China
2.Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
3.Peking Univ, Beijing Natl Lab Mol Sci, Key Lab Bioorgan Chem & Mol Engn, Minist Educ,Coll Chem & Mol Engn, Beijing 100871, Peoples R China
4.Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
5.Air Force Res Lab, Wright Patterson AFB, OH 45433 USA

Recommended Citation:
Hu, Dehua,Liu, Qing,Tisdale, Jeremy,et al. Seebeck Effects in N-Type and P-Type Polymers Driven Simultaneously by Surface Polarization and Entropy Differences Based on Conductor/Polymer/Conductor Thin-Film Devices[J]. ACS NANO,2015,9(5):5208-5213.
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