Tuning the thermal conductivity of solar cell polymers through side chain engineering

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	Tuning the thermal conductivity of solar cell polymers through side chain engineering
	Guo, Zhi 1; Lee, Doyun 2; Liu, Yi 2,3; Sun, Fangyuan 1,4; Sliwinski, Anna 2; Gao, Haifeng 2; Burns, Peter C.2,3; Huang, Libai 5; Luo, Tengfei 1
刊名	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
	2014
卷号	16 期号:17 页码:7764-7771
英文摘要	Thermal transport is critical to the performance and reliability of polymer-based energy devices, ranging from solar cells to thermoelectrics. This work shows that the thermal conductivity of a low band gap conjugated polymer, poly(4,8-bis-alkyloxybenzo[1,2-b: 4,5-b'] dithiophene-2,6-diyl-alt-(alkylthieno[3,4-b]-thiophene-2-carboxylate)-2,6-diyl) (PBDTTT), for photovoltaic applications can be actively tuned through side chain engineering. Compared to the original polymer modified with short branched side chains, the engineered polymer using all linear and long side chains shows a 160% increase in thermal conductivity. The thermal conductivity of the polymer exhibits a good correlation with the side chain lengths as well as the crystallinity of the polymer characterized using small-angle X-ray scattering (SAXS) experiments. Molecular dynamics simulations and atomic force microscopy are used to further probe the molecular level local order of different polymers. It is found that the linear side chain modified polymer can facilitate the formation of more ordered structures, as compared to the branched side chain modified ones. The effective medium theory modelling also reveals that the long linear side chain enables a larger heat carrier propagation length and the crystalline phase in the bulk polymer increases the overall thermal conductivity. It is concluded that both the length of the side chains and the induced polymer crystallization are important for thermal transport. These results offer important guidance for actively tuning the thermal conductivity of conjugated polymers through molecular level design.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Physical ; Physics, Atomic, Molecular & Chemical
研究领域[WOS]	Chemistry ; Physics
关键词[WOS]	POWER CONVERSION EFFICIENCY ; BAND-GAP POLYMERS ; HIGH-PERFORMANCE ; THERMOELECTRIC PROPERTIES ; SEMICONDUCTING POLYMERS ; PHOTOVOLTAIC PROPERTIES ; CHARGE-TRANSPORT ; POLY(2,7-CARBAZOLE) ; MORPHOLOGY ; ENHANCEMENT
收录类别	SCI
语种	英语
WOS记录号	WOS:000334200400016
公开日期	2015-12-22
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/106057]
专题	工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI）
作者单位	1.Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 USA 2.Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA 3.Univ Notre Dame, Dept Civil & Environm Engn & Earth Sci, Notre Dame, IN 46556 USA 4.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China 5.Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA
推荐引用方式 GB/T 7714	Guo, Zhi,Lee, Doyun,Liu, Yi,et al. Tuning the thermal conductivity of solar cell polymers through side chain engineering[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2014,16(17):7764-7771.
APA	Guo, Zhi.,Lee, Doyun.,Liu, Yi.,Sun, Fangyuan.,Sliwinski, Anna.,...&Luo, Tengfei.(2014).Tuning the thermal conductivity of solar cell polymers through side chain engineering.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,16(17),7764-7771.
MLA	Guo, Zhi,et al."Tuning the thermal conductivity of solar cell polymers through side chain engineering".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 16.17(2014):7764-7771.