CuI Encapsulated within Single-Walled Carbon Nanotube Networks with High Current Carrying Capacity and Excellent Conductivity

High current carrying capacity and high conductivity are two important indicators for materials used in microscale electronics and inverters. However, it is challenging to obtain high conductivity and high current carrying capacity at the same time since high conductivity requires a weakly bonded system to provide free electrons, while high current carrying capacity requires a strongly bonded system. In this paper, CuI@SWCNT networks by filling the single-walled carbon nanotubes (SWCNTs) with CuI is ingeniously prepared. CuI@SWCNT shows good stability due to the confinement protection of SWCNTs. Through the host-guest hybridization, CuI@SWCNT networks exhibit a current carrying capacity of 2.04 × 10⁷ A cm⁻² and a conductivity of 31.67 kS m⁻¹. Their current carrying capacity and conductivity are significantly improved compared with SWCNT. The Kelvin probe force microscopy measurements show a drop of surface potential energy after SWCNT filled with CuI, indicating that the CuI guest molecules regulate the position of the Fermi level of SWCNTs, increasing carrier concentration, achieving high conductivity and high current carrying capacity. This study offers ideas and solutions for the regulation of high-performance carbon tube networks, which hold great promise for future applications in carbon-based electronic devices.     

微波促进下碘化亚铜催化合成异香豆素的偶联反应

在微波辐射条件下,用CuI催化邻卤代苯甲酸与1,3-二酮类化合物进行偶联反应,合成了7个异香豆素类衍生物,产率为59.5%~81.3%,其结构经1HNMR,13CNMR和MS表征确认。与传统方法比较,具有操作简单、反应时间短的优点。     

A novel CuI-based iodine-free gel electrolyte for dye-sensitized solar cells

A novel CuI-based iodine-free gel electrolyte using polyethylene oxide (PEO, MW = 100,000) as plasticizer and lithium perchlorate (LiClO₄) as salt additive was developed for dye-sensitized solar cells (DSSCs). Such CuI-based gel electrolyte can avoid the problems caused by liquid iodine electrolyte and has relative high conductivity and stability. The effects of PEO and LiClO₄ concentrations on the viscosity and ionic conductivity of the mentioned iodine-free electrolyte, as well as the performance of the corresponding quasi solid-state DSSCs were investigated comparatively. Experimental results indicate that the performance of DSSCs can be dramatically improved by adding LiClO₄ and PEO, and there are interactions (Li⁺–O coordination) between LiClO₄ and PEO, these Li⁺–O coordination interactions have important influence on the structure, morphology and ionic conductivity of the present CuI-based electrolyte. Addition of PEO into the electrolyte can inhibit the rapid crystal growth of CuI, and enhance the ion and hole transportation property owing to its long helix chain structure. The optimal efficiency (2.81%) was obtained for the quasi solid-state DSSC fabricated with CuI-based electrolyte containing 3 wt% LiClO₄ and 20 wt% PEO under AM 1.5 G (1 sun) light illumination, with a 116.2% improvement in the efficiency compared with the cell without addition of LiClO₄, indicating the promising application in solar cells of the present CuI-based iodine-free electrolyte.     

Light-colored compound conductive coatings based on CuI: Effect of volume fraction of CuI on morphology and electrical conductivity

A novel family of compound conductive coating has been designed and developed using Cu(I)I (cuprous iodide) as electrical conducting material. A carefully designed polyurethane matrix material allowed incorporation of large volume fraction of CuI, much above its critical volume concentration, while maintaining good film integrity. Electrical conductivity of a series of such coatings has been studied using dielectric spectroscopy, as a function of volume fraction of CuI and temperature. The light-colored (white–beige colored) coatings having electrical conductivity of the order of up to 10⁻³–10⁻² S cm⁻¹ have been demonstrated. Scanning electron microscopy (SEM) has been used to characterize bulk coating microstructures. The result of this study provides useful insight for fabrication of compound conductive coatings based on CuI.     

碘化亚铜微晶掺杂硼硅酸盐玻璃的制备及其电致二阶非线性光学效应

采用可分相的Ｎａ２－Ａｌ２Ｏ３－Ｂ２Ｏ３－ＳｉＯ２系为基础玻璃，以ＣｕＯ／ＳｎＯ、ＮａＩ为原料，分别引入Ｃｕ＾＋、Ｉ＾－，成功地制备出ＣｕＩ微晶掺杂硼硅酸盐玻璃。通过Ｘ射线粉末衍射（ＸＲＤ）和高分辨透射电镜（ＨＲＴＥＭ）分析观察到了玻璃中的晶相及其分布；由玻璃的室温透射光谱研究了玻璃的热处理条件下光吸收性的关系。首次报道了该半导体微昌掺杂玻璃中的电致二次谱波发生，并讨论了该效应的机理。     

单轴取向p型半导体CuI薄膜的制备与表征

在室温下用反应沉淀制取了CuI粉体,用溶液生长法在玻璃载体上制备了单轴取向p型半导体CuI薄膜。用XRD、SEM对样品进行了分析,结果表明,CuI粉体为片状结构;晶体薄膜是(111)晶面沿玻璃平行生长的单轴取向马赛克CuI薄膜。阐明了单轴取向CuI薄膜形成的机理。     

Slow interfacial charge recombination in solid-state dye-sensitized solar cell using Al2O3-coated nanoporous TiO2 films

Al₂O₃-coated TiO₂ porous films were used to fabricate solid-state dye-sensitized solar cells using CuI as hole conductor. Investigation with transient photovoltage measurements showed that the Al₂O₃ interlayer slowed down the interfacial recombination of electrons in TiO₂ with holes in CuI by forming a potential barrier at the TiO₂/CuI interface. As a consequence, the cell made from Al₂O₃-coated TiO₂ film showed superior cell performance than the cell made from TiO₂ film only, especially under relative high intensity of simulated sunlight.     

喷涂法制备缓冲层CuI薄膜的生长

采用乙腈为溶剂的喷涂工艺制备晶粒尺寸约为35nm的CuI薄膜。研究乙腈溶液中碘掺杂浓度对CuI薄膜结构、形貌和光学性能的影响。XRD衍射结果表明：碘掺杂的CuI薄膜具有γ态立方闪锌矿结构,沿（111）晶面择优取向生长。SEM结果显示CuI薄膜的微结构与乙腈溶液中碘掺杂量有关;当乙腈溶液中掺杂碘为0.025g时,所制备的CuI薄膜均匀、致密,在可见光区域光学透过率可达75.4%,禁带宽度接近2.96eV。     

染料敏化太阳能电池中PEDOT/PSS-CuI复合电解质的研究

以实验室自制的无机P型半导体CuI纳米粉体、导电聚合物PEDOT/PSS及乙腈为原料,制备了PEDOT/PSS-CuI复合电解质及纯CuI固体电解质进行对比。通过X射线衍射(XRD)对CuI粉体的晶形进行了分析,用四探针电阻仪测定了电解质薄膜的电阻率,测试了染料敏化太阳能电池的性能。结果表明:当CuI在PEDOT/PSS中添加量为20%时,PEDOT/PSS-CuI复合电解质组装电池的性能最好。且PEDOT/PSS-CuI复合电解质的性能稳定性要优于纯CuI固体电解质。     

Characteristics of organic light emitting diodes with copper iodide as injection layer

We have studied the use of a thin copper iodide (CuI) film as an efficient injection layer of holes from indium tin oxide (ITO) anode in a light-emitting diode structure based on tris-8-hydroxyquinoline aluminium (Alq3). The results of impedance analysis of two types of diode structures, ITO/CuI/Alq3/poly(ethylene glycol) dimethyl ether/Al and ITO/Alq3/poly(ethylene glycol) dimethyl ether/Al, are presented. Comparative analysis of their current density-voltage, luminance-voltage and impedance characteristics shows that presence of CuI layer facilitates injection of holes from ITO anode into the light-emitting layer Alq3 and increases electroluminescence efficiency of the organic light emitting diodes.