Four A-D-A type small molecules using 4,4,9,9-tetrakis(4-hexylphenyl)- indaceno[1,2-b:5,6-b′]dithiophene as central building block, bithiophene or terthiophene as π-bridges, alkyl cyanoacetate or rhodanine as end acceptor groups were synthesized and investigated as electron donors in solution-processed organic solar cells (OSCs). These molecules showed excellent thermal stability with decomposition temperatures over 360 °C, relatively low HOMO levels of -5.18 to -5.22 eV, and strong optical absorption from 350 to 670 nm with high molar extinction coefficient of 1.1 × 10 to 1.6 × 10 M cm in chloroform solution. OSCs based on blends of these molecules and PCBM achieved average power conversion efficiencies of 2.32 to 5.09% (the best 5.32%) after thermal annealing. The effects of thiophene bridge length and end acceptor groups on absorption, energy level, charge transport, morphology, and photovoltaic properties of the molecules were investigated. © 2014 American Chemical Society.

Huitao Bai    Yifan Wang    Pei Cheng    李永舫    朱道本     占肖卫   

ACS Applied Materials and Interfaces

2014

A single crystal of a novel mixed-stack donor-acceptor complex formed by a tetracyanoquinodimethane derivative with an extended π-conjugated system and a sulfur-bridged annulene displays the highest ambipolar transport behavior among donor-acceptor complexes reported with electron and hole mobilities reaching up to 0.24 and 0.77 cm V s, respectively. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Qin Yunke    Zhang Jing    Zheng Xiaoyan    Geng Hua    Zhao Guangyao    Wei Xu    Wenping Hu    Zhigang Shuai    朱道本    

Advanced Materials

2014

The Schiff base ligand N1,N3-bis(3-methoxysalicylidene)diethylenetriamine (Hvaldien) and the co-ligand 6-chloro-2-hydroxypyridine (Hchp) were used to construct two 3d-4f heterometallic single-ion magnets [Co Dy(valdien)(OCH)(chp) ]â ClOâ 5 HO (1) and [Co Tb(valdien)(OCH)(chp) ]â ClOâ 2 HOâ CH OH (2). The two trinuclear [CoLn ] complexes behave as a mononuclear Ln magnetic system because of the presence of two diamagnetic cobalt(III) ions. Complex 1 has a molecular symmetry center, and it crystallizes in the C2/c space group, whereas complex 2 shows a lower molecular symmetry and crystallizes in the P2/c space group. Magnetic investigations indicated that both complexes are field-induced single-ion magnets, and the Co -Dy complex possesses a larger energy barrier [74.1(4.2) K] than the Co-Tb complex [32.3(2.6) K]. SIM-ply the best! A new type of 3d-4f single-ion magnet (SIM) with a diamagnetic cobalt(III) ion as the 3d metal is constructed. The large steric hindrance of the cobalt(III) segments in the SIM minimize the number of intermolecular magnetic interactions, and because of the presence of mononuclear Ln magnetic systems, the magnetic anisotropy can be easily modified, which results in remarkable anisotropic barriers. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Caiming Liu    Deqing Zhang    Xiang Hao    朱道本    

Chemistry - An Asian Journal

2014

Heterometallic yellow compound Ba[Fe(CO )](HO) (1) with mononuclear anion [Fe(CO) ] can be transformed to heterometallic red compound Ba [FeO(OH)(CO) ](HO) (2) with OH/O bridged tetranuclear anion [FeO(OH)(CO) ] in the mother liquor. Ba and Fe form three-dimensional networks thorough oxalate anion and HO molecules in 1 and 2. 1 is a paramagnet and a strong antiferromagnetic interaction as the ground state S = 0 exists in 2. © 2014 Elsevier B.V. All rights reserved.

Zhang Bin    Zhang Yan    Chang Guang-Cai    Zengqiang Gao    Wang Dongwei    朱道本    

Inorganica Chimica Acta

2014

New, neutral, slightly puckered aromatic meso-substituted tetrathia[22]porphyrin[2.1.2.1] (TTP) macrocyclic architectures display structure dependent p-type semiconductor behaviour and constitute molecular field effect transistors with a high on/off ratio (1 × 10) and high mobility (0.32 cm V s) in thin films deposited on octadecyltrichlorosilane (OTS) modified SiO. In order to study the influence of steric bulk, molecules with an increasing steric bulk at the meso-position have been synthesized and studied both experimentally and theoretically. The charge transport behavior was evaluated from their thin film organic field-effect transistor (OFET) devices. Single crystal analysis and thin film morphologies of the molecules showed that incorporating a branched hydrocarbon group at the meso-phenyl substituents of TTP not only alters face to face stacking patterns but also changes the morphology of the thin films from highly crystalline to amorphous, as well as lowering the solubility in organic solvents. Such features lead to deterioration of the performance of the organic semiconductor (OSC) devices. © the Partner Organisations 2014.

Virk Tarunpreet Singh    Kamajit Singh    Qin Yunke    Wei Xu    朱道本    

RSC Advances

2014

Two hexanuclear 3d-4f cluster complexes containing the pyridine-2-aldoximate ligand (pao), [NiLn (hfac)(pao)(CHCOO)(MeOH)]·HO·MeOH (Ln = Gd, 1; Ln = Dy, 2; hfac = hexafluoroacetylacetonate), have been synthesized, which show similar structures with an interesting 'trigonal bipyramid' metal topology. Magnetic determinations revealed that the Ni-Gd species has a spin ground state of 16 due to the dominant ferromagnetic exchange, exhibiting an enhanced magnetocaloric effect, which can be used as a cryogenic magnetic cooler; while the Ni-Dy analogue displays slow magnetic relaxation, a typical characteristic of a single-molecule magnet. This journal is

Caiming Liu    Deqing Zhang    朱道本    

RSC Advances

2014

The abundance of solar thermal energy and the widespread demands for waste heat recovery make thermoelectric generators (TEGs) very attractive in harvesting low-cost energy resources. Meanwhile, thermoelectric refrigeration is promising for local cooling and niche applications. In this context there is currently a growing interest in developing organic thermoelectric materials which are flexible, cost-effective, eco-friendly and potentially energy-efficient. In particular, the past several years have witnessed remarkable progress in organic thermoelectric materials and devices. In this review, thermoelectric properties of conducting polymers and small molecules are summarized, with recent progresses in materials, measurements and devices highlighted. Prospects and suggestions for future research efforts are also presented. The organic thermoelectric materials are emerging candidates for green energy conversion.

张黔    Yimeng Sun    Wei Xu    朱道本    

Advanced Materials

2014

The synthesis, crystal structure, Raman spectra, conductivity, and magnetism of the title charge-transfer salt (1) composed of BEDT-TTF [bis(ethylenedithio)tetrathiafulvalene], one-dimensional [Fe(CO)Cl], and the solvent CHCl, are described and interpreted. Electrochemical oxidation of neutral BEDT-TTF in the presence of [(CH)NH][Fe(CO)Cl] in a CHCl/CHOH solution yields crystals of 1, which crystallizes in triclinic form. In 1, two donor molecules stack in a face-to-face manner as a BEDT-TTF dimer. The BEDT-TTF dimers form a (4,4) grid in the ab plane. The cavity of the (4,4) grid is occupied by two CHCl molecules. The donor layers are separated by sheets of [Fe(CO)Cl] anions with a zigzag chain along the a axis. There are S⋯S interactions between the donors, and S⋯Cl interactions between the donor and the anion. On the χ vs. T plot, a broad maximum is observed around 45 K, showing the existence of antiferromagnetic interactions between the metal atoms in the low-dimensional system. The formal charge of the donor molecules is assigned 1.0+ based on the bond lengths of the TTF core and on the Raman spectra. The material is a semiconductor with σ = 1.8 × 10 S/cm. The title compound has been synthesized and studied, and it was found that the donor layers in the organic-inorganic hybrid charge-transfer salt, which is composed of BEDT-TTF dimers and CHCl, are separated by zigzaged anion chains. The compound is a semiconductor and shows strong antiferromagnetic interactions between the oxalate-bridged metal atoms.

Zhang Bin    Zhang Yan    Zengqiang Gao    Chang Guang-Cai    Su Shaokui    Wang Dongwei    Yanjun Guo    朱道本    

European Journal of Inorganic Chemistry

2014

Multi-functional organic field-effect transistors (OFETs), an emerging focus of organic optoelectronic devices, hold great potential for a variety of applications. This report introduces recent progress on multi-functional OFETs including OFETs based sensors, phototransistors, light-emitting transistors, memory cells, and magnetic field-effect OFETs. Key strategies towards multi- functional integration of OFETs, which involves the exploration of functional materials, interfaces modifications, modulation of condensed structures, optimization of device geometry, and device integration, are summarized. Furthermore, remaining challenges and perspectives are discussed, giving a comprehensive overview of multi-functional OFETs. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chongan Di    Fengjiao Zhang    朱道本    

Advanced Materials

2013

Substituted side chains are fundamental units in solution processable organic semiconductors in order to achieve a balance of close intermolecular stacking, high crystallinity, and good compatibility with different wet techniques. Based on four air-stable solution-processed naphthalene diimides fused with 2-(1,3-dithiol-2-ylidene)malononitrile groups (NDI-DTYM2) that bear branched alkyl chains with varied side-chain length and different branching position, we have carried out systematic studies on the relationship between film microstructure and charge transport in their organic thin-film transistors (OTFTs). In particular synchrotron measurements (grazing incidence X-ray diffraction and near-edge X-ray absorption fine structure) are combined with device optimization studies to probe the interplay between molecular structure, molecular packing, and OTFT mobility. It is found that the side-chain length has a moderate influence on thin-film microstructure but leads to only limited changes in OTFT performance. In contrast, the position of branching point results in subtle, yet critical changes in molecular packing and leads to dramatic differences in electron mobility ranging from ∼0.001 to >3.0 cm V s. Incorporating a NDI-DTYM2 core with three-branched N-alkyl substituents of C results in a dense in-plane molecular packing with an unit cell area of 127 Å, larger domain sizes of up to 1000 × 3000 nm, and an electron mobility of up to 3.50 cm V s, which is an unprecedented value for ambient stable n-channel solution-processed OTFTs reported to date. These results demonstrate that variation of the alkyl chain branching point is a powerful strategy for tuning of molecular packing to enable high charge transport mobilities. © 2013 American Chemical Society.

Fengjiao Zhang    Yunbin Hu    Schuettfort    Chongan Di    高希珂    Christopher McNeill    Lars Thomsen    Stefan Mannsfeld    Wei Yuan    Henning Sirringhaus    朱道本    

Journal of the American Chemical Society

2013