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Diamine anchored molecular j unctions of oligo(phenylene ethynylene) cruciform

Chinese Chemical Letters 2018年第2期29卷 271-275页

作者： Yuqing Liua Marco Santella Zhiqiang Fan Xintai Wang Xiangwei Jiang mogens brondsted nielsen Kasper NФrgaard3 Bo W. Laursen Jingbo Li Zhongming Wei State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Belting 100083 China Sino-Danish College University of Chinese Academy of Science Beijing 100049 China Nano-Science Center and Department of Chemistry University of Copenhagen Copenhagen DK-2100 Denmark Sino-Danish Center for Education and Research Beijing 100049 China

Using diamine as anchoring group, the self-assembled monolayers（SAMs） based on oligo（phenyleneethynylene）s（OPEs） and cruciform OPEs with an extended tetrathiafulvalene（TTF）（OPE3 and OPE3-TTF）were successfully formed on the Au substrate. The Uniformity and stability of SAMs were confirmed through cyclic voltammetry（CV） and electrochemical reductive desorption. The investigation of transport properties of SAMs was achieved by conducting-probe atomic force microscopy（CP-AFM） with both Au and Pt tips. The results indicated that the conductance of OPE3-TTF was 17 and 46 times that of OPE3 for Au and Pt tips, respectively. Theoretical calculations are qualitatively consistent with the experimental results, suggesting that the diamine as anchoring group has a great potential in molecular electronics.

关键词： Oligo(phenylene-ethynylene) Tetrathiafulvalene Diamine Molecular electronics Cruciform

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Tuning crystal polymorphs of a π-extended tetrathiafulvalene-based cruciform molecule towards high-performance organic field-effect transistors

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Science China Materials 2017年第1期60卷 75-82页

作者： Linlin Feng1 Beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal University Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences Department of Chemistry University of Copenhagen State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of SciencesTianjin University&Collaborative Innovation Center of Chemical Science and Engineering

It is a common phenomenon for organic semi- conductors to crystallize in two or more polymorphs, leading to various molecular packings and different charge transport properties. Therefore, it is a crucial issue of tuning molec- ular crystal polymorphs （i.e., adjusting the same molecule with different packing arrangements in solid state） towards efficient charge transport and high performance devices. Here, the choice of solvent had a marked effect on con- trolling the growth of a-phase ribbon and β-phase platelet during crystallization for an indenofluorene （IF） π-extended tetrathiafulvalene （TTF）-based cruciform molecule, named as IF-TTF. The charge carrier mobility of the a-phase IF-TTF crystals was more than one order of magnitude higher than that of β-phase crystals, suggesting the importance of reasonably tuning molecular packing in solid state for the improvement of charge transport in organic semiconductors.

关键词： organic semiconductor crystal polymorphs tetrathiafulvalene-based cruciform molecule field-effect transistor charge carrier mobility

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