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

doi:10.1021/acsnano.5b00589

CORC > 北京大学 > 化学与分子工程学院

	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
	Hu, Dehua ; Liu, Qing ; Tisdale, Jeremy ; Lei, Ting ; Pei, Jian ; Wang, Hsin ; Urbas, Augustine ; Hu, Bin
刊名	ACS NANO
	2015
关键词	Seebeck effects charge-transfer states surface polarization entropy difference n-type organic polymer p-type organic polymer ENHANCEMENT DENSITY VOLTAGE STATES
DOI	10.1021/acsnano.5b00589
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.; NSF [ECCS-0644945]; Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy [CNMS2012-106, CNMS2012-107]; UT-Battelle LLC [DE-AC05000OR22725]; National Significant Program [2014CB643506, 2013CB922104]; National Science Foundation [61077020, 61205034, 61475051]; SCI(E); EI; ARTICLE; bhu@utk.edu; 5; 5208-5213; 9
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/420316]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	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.
APA	Hu, Dehua.,Liu, Qing.,Tisdale, Jeremy.,Lei, Ting.,Pei, Jian.,...&Hu, Bin.(2015).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.ACS NANO.
MLA	Hu, Dehua,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".ACS NANO (2015).