Kinetically Controlled Crystallization in Conjugated Polymer Films for High-Performance Organic Field-Effect Transistors

被引:47
作者
Kim, Yeon-Ju [1 ]
Kim, Nam-Koo [2 ]
Park, Won-Tae [3 ]
Liu, Chuan [4 ,5 ]
Noh, Yong-Young [3 ]
Kim, Dong-Yu [1 ]
机构
[1] GIST, Sch Mat Sci & Engn MSE, HCAM, Res Inst Solar & Sustainable Energies RISE, 123 Cheomdan Gwagiro, Gwangju 61005, South Korea
[2] LG Elect, Mat & Devices Adv Res Inst, Seoul 06763, South Korea
[3] Pohang Univ Sci & Technol POSTECH, Dept Chem Engn, 77 Cheongam Ro, Pohang 37673, South Korea
[4] Sun Yat Sen Univ, Sch Elect & Informat Technol, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China
[5] Sun Yat Sen Univ, Sch Elect & Informat Technol, Guangdong Prov Key Lab Display Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China
基金
中国国家自然科学基金; 新加坡国家研究基金会;
关键词
charge carrier mobility; conjugated polymer; kinetic control; organic field-effect transistor; polymer domain; CARRIER TRANSPORT; CHARGE-TRANSPORT; HIGH-MOBILITY; SEMICONDUCTORS; MORPHOLOGY; SOLIDIFICATION; NUCLEATION; TEXTURE; SOLVENT; ORDER;
D O I
10.1002/adfm.201807786
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Ordering of semiconducting polymers in thin films from the nano to microscale is strongly correlated with charge transport properties as well as organic field-effect transistor performance. This paper reports a method to control nano to microscale ordering of poly{[N,N '-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5 '-(2,2 '-bithiophene)} (P(NDI2OD-T2)) thin films by precisely regulating the solidification rate from the metastable state just before crystallization. The proposed simple but effective approach, kinetically controlled crystallization, achieves optimized P(NDI2OD-T2) films with large polymer domains, long range ordered fibrillar structures, and molecular orientation preferable for electron transport leading to dramatic morphological changes in both polymer domain sizes at the micrometer scale and molecular packing structures at nanoscales. Structural changes significantly increase electron mobilities up to 3.43 +/- 0.39 cm(2) V-1 s(-1) with high reliability, almost two orders of enhancement compared with devices from naturally dried films. Small contact resistance is also obtained for electron injection (0.13 M omega cm), low activation energy (62.51 meV), and narrow density of states distribution for electron transport in optimized thin films. It is believed that this study offers important insight into the crystallization of conjugated polymers that can be broadly applied to optimize the morphology of semiconducting polymer films for solution processed organic electronic devices.
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页数:9
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