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thickness dependence of Doping Level in Conducting Polymer Films:the Optical Contrast Optimization in Electrochromism as a Case Study

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Chinese Journal of Chemistry 2022年第5期40卷 597-602页

作者： Jianqiao Wang Huanhuan Zhang Yuguang Ma State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyNo.381 Wushan RoadTianhe DistinctGuangzhouGuangdong510640 China

Doping plays an essential role in the properties of conducting polymers.Film thickness not only has a direct influence on their photoelectric properties,but also affects the doping ability,which may lead to the decline of capacitance and electrochromic properties caused by incomplete doping.Therefore,it is essential to study the quantitative relationship between doping level and film thickness in application.Herein,empirical formula between doping level and thickness was obtained by studying the spectroelectrochemistry behaviors of two different electrochromic materials,poly(N,N'-bis(3,5-(2-thienyl)-phenyl)-1,6,7,12-tetrachloroperylene-3,4,9,10-perylenetetracarboxylic diimide)(poly(Th-Cl-PBI))and poly(3,4-ethylenedioxythiophene)(PEDOT).The doping level is verified to be correlated to the reciprocal of the 3^(rd)power of film thickness.Experimental results fit these formulas very well,giving correlation coefficient R^(2)higher than 0.99.The optical contrast prediction of these two electrochromic materials is also used to verify this relationship formula.For the first time,we quantitatively connect these two important parameters of conducting polymers,doping level and thickness.

关键词： Doping Electrochemistry Polymers Electrochromism thickness dependence

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thickness dependence of surface morphology and charge carrier mobility in organic field-effect transistors

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Chinese Physics B 2010年第1期19卷 527-533页

作者：田雪雁徐征赵谡玲张福俊袁广才李婧孙钦军王赟徐叙瑢 Institute of Optoelectronic Technology Beijing Jiaotong University Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University) Ministry of Education

With the aim of understanding the relationships between organic small molecule field-effect transistors （FETs） and organic conjugated polymer FETs, we investigate the thickness dependence of surface morphology and charge carrier mobility in pentacene and regioregular poly （3-hexylthiophene）（RR-P3HT） field-effect transistors. On the basis of the results of surface morphologies and electrical properties, we presume that the charge carrier mobility is largely related to the morphology of the organic active layer. We observe that the change trends of the surface morphologies （average size and average roughness） of pentacene and RR-P3HT thin films are mutually opposite, as the thickness of the organic layer increases. Further, we demonstrate that the change trends of the field-effect mobilities of pentacene and RR-P3HT FETs are also opposite to each other, as the thickness of the organic layer increases within its limit.

关键词： organic field-effect transistors morphology thickness dependence field-effect mobility

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