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《精细化工》2013,(9)
合成了以三苯胺为电子给体,氰基乙酸为电子受体,乙烯基单噻吩、乙烯基联噻吩和乙烯基烷基取代联噻吩作为共轭桥链的4个有机染料TD1、TD2、TD3和TD4。用核磁共振、质谱和傅里叶变换红外光谱对其结构进行了表征。通过电池性能、吸收和发射光谱分析及电化学测试,研究了增加共轭桥链、引入烷基链及烷基链的长短对染料光物理、电化学和光伏等性能的影响。结果表明,引入烷基链可以显著地提高短路电流和开路电压,并获得了较高的光电转化效率。其中以己基取代联噻吩作为共轭桥链的TD3,表现出最大的光电转化效率6.78%,达到了相同条件下测得的N719(7.64%)光电转化效率的88.7%。 相似文献
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合成了以三苯胺为电子给体,氰基乙酸为电子受体,乙烯基单噻吩、乙烯基联噻吩和乙烯基烷基取代联噻吩作为共轭桥链的4个有机染料TD1、TD2、TD3和TD4。用核磁共振、质谱和傅里叶变换红外光谱对其结构进行了表征。通过电池性能、吸收和发射光谱分析及电化学测试,研究了增加共轭桥链、引入烷基链及烷基链的长短对染料光物理、电化学和光伏等性能的影响。结果表明,引入烷基链可以显著地提高短路电流和开路电压,并获得了较高的光电转化效率。其中以己基取代联噻吩作为共轭桥链的TD3,表现出最大的光电转化效率6.78%,达到了相同条件下测得的N719(7.64%)光电转化效率的88.7%。 相似文献
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对光敏染料在Graetzel型太阳能电池上的应用及其研究进展进行了综述。比较了天然染料、纯有机染料和金属有机配合物染料对此类电池的敏化效果,并讨论了染料的结构和性质对电池性能的影响,指出通过分子设计合成高效光敏染料可推动Graetzel型太阳能电池的发展和实用化。 相似文献
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染料敏化太阳能电池(DSSCs)为无机固态光伏电池提供了可靠的可代替概念。染料敏化太阳能电池的光电转换效率主要依赖于纳米晶多孔半导体TiO2薄膜电极的染料。由于天然染料的低成本和工艺制备简单的优点,天然染料作为敏化剂已成为DSSC研究热点。作为DSSC的敏化剂的天然染料,如花青素类、胡萝卜素类、叶绿素类、类黄酮,可从不同植物不同部分提取出。主要介绍和讨论天然敏化剂的发展和实用化必须解决的关键问题。 相似文献
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染料敏化纳米晶太阳能电池的研究进展 总被引:2,自引:0,他引:2
染料敏化太阳能电池是近些年发展起来的新型、高效、低成本的光电池。而起到负载敏化剂以及收集、传输电子作用的光阳极是关系到该电池性能的重要组成部分,且敏化的效果是整个光电池光电转换效率的关键。从染料敏化纳米晶太阳能电池(DSSD s)的结构和工作原理出发,详细阐述了光阳极敏化、敏化剂选择及分类和敏化方法,并对光阳极及其敏化的可能发展趋势做了简要叙述。 相似文献
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Mieczys?aw ?apkowski Sylwia Plewa Jacek Doskocz Joanna Cabaj Wies?aw W. Su?kowski 《Electrochimica acta》2008,53(5):2545-2552
An electrochemical and spectroelectrochemical study of a new monomer—N-alkyl-bis(thiophene)phenotiazine have been presented. Electrochemical polymerization of the monomer leads to a polymer with alternate phenothiazine and bithiophene units. Polymerization proceeds after bielectronic oxidation of the molecule. Monoelectronic oxidation gives a stable radical cation with spin located on phenothiazine. Electrochemical properties of the polymer depend on the thickness of the film deposited on the electrode. For thin layers one can observe a characteristic redox couple of phenothiazine oxidation to a radical cation. Analysis of the polymer behaviour and the results of spectroelectrochemical measurements indicate a mixed-type of polymer conductivity. 相似文献
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Summary The energy transfer ability of free and polymer-bound acetophenone and benzophenone has been studied. The polymeric sensitizers were prepared by acetylation or benzoylation of atactic polystyrene (¯Mn=67.000). Trans-cis isomerization of stilbene, monitored by UV-spectrophotometry, has enabled the energy transfer process to be probed. The values of the Stern-Volmer constants, determined by following this technique, indicate that the energy transfer efficiency of both ketones is higher when they are in free state than when they are polymer-bound. 相似文献
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Summary The xanthene dye Rose Bengal (disodium salt of 3, 4, 5, 6-tetrachloro-2, 4, 5, 7-tetraiodofluorescein) has been covalently bound to a linear (soluble) copoly styrene-vinyl benzyl chloride. The chemical union takes place through alkylation of the carboxylate anion of the dye by one of the chloromethyl groups grafted on the polymer. The quantum yield of singlet oxygen generation results equal to that of the free dye and the photostability seems to be improved.Financial aid by C.A.I.C.Y. T. is gratefully appreciated. 相似文献
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Several 3-ketocoumarins with alkoxy or dialkylamino substituents in the 7 position, which are efficient sensitizers for crosslinkable polymers, were evaluated as photoinitiators. Proper combinations of certain derivatives of these ketocoumarins with activators such as amines, acetic acid derivatives, and alkoxypyridinium salts gave quantum yields for initiated radical polymerization much higher than that obtained from the Michler's ketone/benzophenone combinations. For each class of activators the dependence of the efficiency of polymerization on the redox properties of the ketocoumarins is explained in terms of charge transfer or electron transfer from the activator to the excited ketocoumarin (acetic acid and amine activators, respectively) or electron transfer in the opposite direction (pyridinium salt activators). 相似文献
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This review discusses the biochemical action and ecological significance of phototoxic phytochemicals. Mechanistic details of photosensitization as well as cellular and molecular targets of plant-derived phototoxins in model biological systems (microbial and in vitro) and in herbivorous insects are described. Findings from these studies suggest the potential importance of phototoxic plant metabolites in plant-insect interactions. Aspects of phototoxin distribution and significance in diverse ecosystems are considered, and areas for future research are suggested. 相似文献
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A series of soluble alternating fluorene-based copolymers containing diaryl- and non-substituted bithiophene units are synthesized by palladium-catalyzed Suzuki coupling reaction. All polymers demonstrate green colors of photoluminescence (PL) in chloroform, good thermal stability (with decomposition temperatures above 436 °C), and high glass transition temperatures (in the range of 120-144 °C). Owing to the large steric hindrance of diaryl substituents on bithiophenes in the polymers (P2-P4), the aggregation of solids is reduced as well as the solubility is improved, so the performance of their PLED devices are superior to that of the non-substituted polymer (P1). Compared with P1, the introduction of substitutents at 3,3′-position of bithiophene in P2-P4 has significant effects on the photophysical properties of resulting polymers in solution and solid states. Though the PL quantum yield of P1 is much higher than those of diaryl-substituted polymers (P2-P4), the PLED device of P1 has the worst electroluminescence (EL) properties due to the poor solubility of P1. Consequently, among these polymers, the device made of P3 as an emitter has the highest luminance of 2590 cd/m2 at 9.5 V. For optimum device performance, a device of P3 blended with PVK can be further enhanced to a brighter luminance of 4284 cd/m2 at 18 V. 相似文献
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Alternating copolymer of bithiophene and dialkylbithiazole and its tendency to align on the surfaces
Takakazu Yamamoto Syun-ichi Otsuka Hiroki Fukumoto Takashi Fukuda Takeshi Yamanobe Zhengguo Cai 《Polymer》2006,47(17):6038-6041
New five-membered ring π-conjugated polymers composed of 2,2′-bithiophene and 4,4′-dialkyl-2,2′-bithiazole units were prepared. The polymers were soluble in 1,2-dichlorobenzene and showed a UV-vis peak at about 490 nm above 120 °C. Cooling the solution led to the appearance of new UV-vis peaks at 550 and 600 nm, which were considered to originate from self-assembled polymer molecules. Powder XRD (X-ray diffraction) data supported a well-stacked solid structure of the polymers and a highly ordered structure of a polymer film formed on a quartz glass substrate. These data revealed a strong tendency of the new polymers to self-assemble and to form an aligned structure on the surface of the substrates. 相似文献