共查询到20条相似文献,搜索用时 15 毫秒
1.
Rajalingam Agneeswari Minsung Kong Jihoon Lee Ji Hyeon Kwon Vellaiappillai Tamilavan Seong Soo Park 《Molecular Crystals and Liquid Crystals》2019,685(1):29-39
AbstractTwo new semiconducting organic small molecules, namely BDTQ-BDT(EH) and BDTQ-BDT(OC), were prepared by attaching electron accepting 2,3-didodecyl-6,7-difluoro-5,8-di(thiophen-2-yl)quinoxaline (DTQ) unit on 2,6-position of electron donating 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b']dithiophene (BDT(EH)) and 4,8-bis(octyloxy)benzo[1,2-b:4,5-b']dithiophene (BDT(OC)) units. Molecule BDTQ-BDT(EH) showed higher thermal stability (5% weight loss temperature, Td “349 оC), slightly lower band-gap (Eg “2.10?eV) and deeper highest occupied molecular orbital energy level (HOMO “–5.36?eV) level compared to those (Td “336 оC, Eg “2.11?eV, and HOMO “–5.30?eV, respectively.) of the molecule BDTQ-BDT(OC). The organic solar cells (OSCs) made with the synthesized molecules as an electron donor and [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) as an electron acceptor gave a maximum power conversion efficiency (PCE) of 1.20% and 0.83%, respectively, for BDTQ-BDT(EH) and BDTQ-BDT(OC). This study confirmed that the substituents attached on the 4,8-position of BDT unit greatly alter the properties of the resulting molecules. 相似文献
2.
AbstractTwo 1,3-bis(thiophen-2-yl)?5,7-bis(2-ehtylhexyl)benzo-[1,2-c:4,5-c]-dithiophene-4,8-dione (BDD) based small molecules, SM1 and SM2 are designed and synthesized by incorporating benzodithiophene (BDT) central core, BDD dual accepting units and 3-ethyl rhodamine as endcap group with various number of BDT units. We systematically investigated the synthesis, optical and electrochemical properties, and photovoltaic characteristics of these donor materials. The number of BDT units have a significant influence on Jsc due to interconnected structure and results in a broader absorption on thin film. The inverted devices employed for both small molecules exhibited power conversion efficiencies of 0.41% for SM1 and 0.82% for SM2. 相似文献
3.
AbstractWe have synthesized two acceptor-donor-acceptor (A-D-A) type quinoxaline-based small molecules for organic photovoltaic cells (OPVs). To construct the A-D-A architecture, the electron-accepting quinoxaline derivative (Qx) was attached on both ends of the electron-donating benzodithiophene (BDT) unit via the Stille coupling reaction. After the confirmation of the structural features, the optical and electrochemical characteristics and the photovoltaic properties of the two small molecules were investigated. A typical inverted-type device with the configuration of ITO/ZnO/small molecules: PC71BM/MoO3/Ag was fabricated and examined. It has been observed that the performances of OPVs were improved by the incorporation of the additional thiophene linkage between the BDT and Qx moieties. Therefore, this study can provide insights into the design and structure–property correlation of quinoxaline-based organic small molecules for OPVs 相似文献
4.
Jeffrey C. Bryan Benjamin P. Hay Richard A. Sachleben Cassandra T. Eagle Cungen Zhang Peter V. Bonnesen 《Journal of chemical crystallography》2003,33(5-6):349-355
The podand, bis(2-methoxyphenoxy)m-xylene (1), was designed and synthesized as a potential host for the cesium ion. Its structure was determined by single crystal X-ray diffraction. It crystallizes in P21/c with cell dimensions: a = 8.5723(7) Å, b = 8.3931(14) Å, c = 25.2879(26) Å, = 96.224(9), and V = 1808.7(4) Å3. A crown derivative, tribenzo-21-crown-6 (2), was also prepared and structurally characterized. It also crystallizes in P21/c with cell dimensions: a = 15.5825(13) Å, b = 15.8648(16) Å, c = 8.8266(7) Å, = 95.247(6), and V = 2172.9(3) Å3. The structures exhibit hydrogen bonding, and are evaluated in terms of complementarity and preorganization for cesium binding. 相似文献
5.
A. S. Beni M. Zarandi A. R. Madram Y. Bayat A. N. Chermahini R. Ghahary 《Molecular Crystals and Liquid Crystals》2016,629(1):29-43
Carbazole is an alternant polycyclic aromatic hydrocarbon consisting of three fused rings with a large, aromatic system, containing nitrogen atom showing extensive electron delocalization. In this work, carbazole applied as π-conjugated bridge to construct electron donor–π–electron acceptor (D–π–A) organic dyes, where barbutiric acid and thiazolidine-2,4-dione as electron acceptor. The effects of these three acceptors and length of alkyl on the performance of the DSSCs were investigated systematically along with their photophysical and photo electrochemical properties. These series of organic dyes include (B-CH, B-C B, DT-CB, DB-CB). Our investigation indicate among dyes containing butyl as same donor, DT-CB exhibited the maximum overall conversion efficiency of 1.44% and from dyes by deferent electron donor B-CH shows conversion efficiency of 1.47%. 相似文献
6.
M. John Plater Mark R. St J. Foreman Janet M.S. Skakle 《Journal of chemical crystallography》2000,30(7):449-453
The hydrothermal synthesis and crystal structure of the title compound is reported. The structure consists of 1-D looped chains with the HTPO ligand binding through the phosphoryl and two carboxylate oxygens to manganese atoms. The carboxylic acid group is hydrogen bonded to adjacent chains forming a 2-D hydrogen bonded network. The crystals are triclinic and the space group isP-1 with a = 11.6767(8) Å, b = 10.8680(8) Å and c = 11.4232(87rpar; Å = 92.301(2)°, = 106.932(2)° and = 103.2390(10)° V = 1341.02(16) Å3; Z = 2. 相似文献
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8.
Jianfeng Li Meiling Ren Jicheng Qing Yufei Wang Zezhou Liang Ningning Wang 《Molecular Crystals and Liquid Crystals》2019,692(1):74-82
AbstractIn this work, electron transport layers (ETLs) with high charge transfer ability were prepared by doping ZnO nanoparticles with different concentrations of cadmium(Cd). The inverted polymer solar cell based on PTB7-Th: PC71BM as active layer and various concentrations Cd-doped ZnO (CZO) as ETLs were fabricated. The PCE of the device with optimized Cd content in the ZnO film was about 14.7% larger than that of the pure ZnO-based cells. The cadmium-doped ZnO(CZO) is a good candidate to be used as a high-quality transparent electrode in solar cell applications. 相似文献
9.
Four new liquid crystalline thiophene compounds (M1?M4) with a long flexible spacer were prepared. Their structures were characterized by Fourier transform infrared and proton nuclear magnetic resonance. The mesomorphism and thermal stability were investigated with differential scanning calorimetry, polarizing optical microscopy, and thermogravimetric analysis. The photo-physical properties were evaluated using ultraviolet/visible spectroscopy and photoluminescence. M1?M4 all showed thermotropic mesogenic properties with excellent thermal stability, and exhibited nematic threaded texture, droplet texture, and Schlieren texture on heating and cooling cycles. The effect of flexible spacer and terminal groups on mesomorphic and spectroscopic property is discussed. The experimental results demonstrated that the tendency toward melting temperature (Tm) decreased, while isotropic temperature (Ti) increased with increasing the flexible spacer length. In CHCl3 solution, these thiophene compounds displayed an intense broad absorption band peaking within 230–340 nm and a maximum fluorescent emission wavelength at 426–439 nm. 相似文献
10.
本征微晶硅薄膜和微晶硅电池的制备及其特性研究 总被引:1,自引:0,他引:1
本文对VHF-PECVD制备的本征微晶硅薄膜和电池进行了电学特性和结构特性方面的测试分析研究.电学测试结果给出制备薄膜的激活能为0.51eV,符合电池对材料的电学参数要求;拉曼散射谱测试结果计算得到样品的晶化率为63;;X射线衍射结果也证明材料晶化,同时(220)方向择优;首次在国内用VHF-PECVD方法制备出效率为5;的微晶硅电池(Jsc=21mA/cm2,Voc=0.46V,FF=51;,Area=0.253cm2). 相似文献
11.
近年来,有机-无机钙钛矿太阳能电池由于卓越的光电性能和极低的材料成本引起广泛关注,更被认作是一种前景广阔的光伏材料.目前,钙钛矿太阳能电池的光电转换效率已经超过22;,展示了极大的发展潜力,但对紫外线辐射和水的长期稳定性差.因此,关于钙钛矿太阳能电池的研究主要集中在电池的高效性和稳定性.本文对提高钙钛矿太阳能电池的效率和稳定性的多种方法进行综述,介绍了近期获得的突破,旨在为实现提高钙钛矿太阳能电池的高效性和稳定性提供基本依据. 相似文献
12.
Rod‐shape, branch‐shape, bouquet‐shape and claw‐shape SrCrO4 crystals were synthesized through biomembrane/organic‐addition supramolecular templates. The shapes are mainly changed with variance of the organic reagents and organic membranes. Most of the morphologies haven't been reported in the literature. This method may meet with the requirements to synthesize materials of various morphologies and size by using different supramolecular templates. This paper discusses how to control crystals' growth by supramolecular templates. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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AbstractNew non-conjugated small molecules (C4-OH and C6-OH) were synthesized and applied to the inverted organic solar cells (OSCs) as the cathode interlayer (CIL). The power conversion efficiencies (PCEs) of 9.35 and 9.21% were obtained in the device based on ZnO/C4-OH and ZnO/C6-OH, which are better than those of pristine ZnO (8.74%). The work function of ZnO/C4-OH and ZnO/C6-OH are also decreased from ?4.5?to ?4.27?eV and ?4.37?eV, respectively. Consequently, OSCs with two small molecules exhibited enhanced photovoltaic properties due to the formation of interface dipole. 相似文献
15.
Woong Shin Gyeong Eun Lim Nadhila Sylvianti Mutia Anissa Marsya Devi Saskia Putri Youn Whan Kim 《Molecular Crystals and Liquid Crystals》2016,635(1):40-44
ABSTRACTA series of small-molecules (SMs) based on coplanar perylene unit coupled with diketopyrrolopyrrole chromophoric core exhibit broad absorption in the range of 500–800 nm and low bandgap energise of 1.6–1.7 eV. The power conversion efficiency approximately reach at 0.4% under 1.5 G illumination is achieved for organic solar cells based on a small-molecule bulk heterojunction system consisting of SMs as a donor and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as an acceptor. 相似文献
16.
The complex {[Eu2F34H2O]3H2O}n (H2F = fumaric acid) has been synthesized and structurally characterized by single crystal X-ray diffration methods. The complex crystallizes in the monoclinic system with space group P21/n, lattice parameters a = 9.475(3) Å, b = 14.700(5) Å, c = 14.810(4) Å, = 90, = 91.250(5), = 90, V = 2062.1(11) Å3, Z = 4, Dcalc = 2.487 Mg/m3. The Eu(III) center is in distorted tricapped trigonal prism coordination environment that is coordinated by nine oxygen atoms, seven from five F2– groups, two from two water molecules. Eu(III) ions are connected into three-dimensional coordination network structure by the oxygen atoms of the carboxyl groups and hydrogen bonds. 相似文献
17.
新型配位聚合物[Ni(C6H4NO2)2(H2O)4]n的水热合成和晶体结构 总被引:4,自引:4,他引:0
以NiCl2·6H2O和4-氰基吡啶为原料,在中温水热反应条件下,合成了一种新型配位聚合物[Ni(C6H4NO2)2(H2O)4]n单晶体,并对其进行了元素分析、红外光谱表征和X射线单晶衍射测定.该配位聚合物属三斜晶系,P-1空间群,a=0.6298(4)nm,b=0.6907(4)nm,c=0.9243(5)nm,α=96.437(8)°,β=105.184(9)°,γ=113.314(9)°,V=0.3456(3)nm3,Z=2,dc=1.802 g/cm3,μ=1.452mm-1,F(000)=194,R1=0.0309,R2=0.0753.该晶体通过配位键的连接和分子间氢键相互作用形成三维的网状结构. 相似文献
18.
Directional solidification is one of the most popular techniques for massive production of multicrystalline silicon. After growth and annealing, the ingot is cooled down by a designed cooling process, which is initialized by descending bottom insulation, and then is controlled both by power ramp‐down rate and by motion of the bottom insulation. Thermal stress is piled up during cooling, and associated crystal defects, such as dislocation and micro‐cracks, may generate and propagate in the ingot. In the paper, transient modeling is applied to study the effect of bottom insulation on the cooling process. Temperature, velocity and thermal stress fields are obtained with linear, parabolic and sinusoidal motions of the insulation. The measured and predicted temperatures at two points of the ingot are found consistent. Distributions of von Mises stress in the ingot at different cooling time are obtained, and the maximum von Mises stresses are presented as a function of the cooling time. Specifically, dislocation‐free regions, evaluated by the critical resolved shear stress model, at certain cooling time, and area fractions of the regions as a function of the cooling time are proposed. The linear motion is further discussed with different moving rates, considering its wide applications in the current industry and convenient realization in control. 相似文献
19.
Pengfei Gu Xudong Wang Tao Li Hongying Yu Huimin Meng 《Crystal Research and Technology》2013,48(11):989-995
Several novel asymmetric ZnO hierarchical structures were synthesized in diethylene glycol (DEG) with different amount of ammonia solution via solvothermal process. The submicron‐rods or nanorods as the building units are distributed on the two sides in an asymmetric manner, resulting in formation of the shiitake‐like or bouquet‐like morphology. A possible formation mechanism was proposed on the basis of the experimental result. The consumption of the precursor could lead to a two‐step nucleation and growth process. The relative content of the [Zn(OH)4]2− and the [Zn(NH3)4]2+ precursors varies with the amount of ammonia solution, which affect the size and morphology of the asymmetric structures. The [Zn(OH)4]2− complex and the [Zn(NH3)4]2+ complex are absorbed on the positive (0001)‐Zn polar surface and the negative (000–1)‐O polar surface respectively, which lead to the alteration of growth rate of these polar surfaces. 相似文献
20.
新型配位聚合物[Co(pda)2(H2O)2]n的水热合成和晶体结构 总被引:2,自引:0,他引:2
以CoCl2·6H2O和3-(3-吡啶基)丙烯酸(pda)为原料,在中温水热反应条件下,合成了一种新型配位聚合物[Co(pda)2(H2O)2]n单晶体,并对其进行了元素分析、红外光谱表征、TGA-GTA分析和X射线单晶衍射测定.该配位聚合物属单斜晶系,P2(1)/c空间群,晶胞参数为a=1.6958(8)nm;b=0.5466(3)nm;c=1.8034(8)nm;α=90°;β=106.209(7)°;γ=90°;Mr=391.24;V=1.6051(13)nm3;Z=4;dc=1.619g/cm3;μ=1.106mm-1;F(000)=804;R1=0.0367;wR2=0.0711.该晶体通过配位键的连接形成二维结构,又通过分子间氢键和π-π相互作用形成三维的网状结构. 相似文献