Indole-substituted nickel dithiolene complexes in electronic and optoelectronic devices
作者:Simon Dalgleish、John G. Labram、Zhe Li、Jianpu Wang、Christopher R. McNeill、Thomas D. Anthopoulos、Neil C. Greenham、Neil Robertson
DOI:10.1039/c1jm12466h
日期:——
The synthesis and full characterisation of a novel indole-substituted nickel dithiolene [Ni(mi-5edt)2] (3) is reported, and compared to its alkyl-substituted analogue [Ni(mi-5hdt)2] (4) that has been previously communicated [Dalgleish et al., Chem. Commun., 2009, 5826] [mi-5edt = 1-(N-methylindol-5-yl)-ethene-1,2-dithiolate; mi-5hdt = 1-(N-methylindol-5-yl)-hex-1-ene-1,2-dithiolate)]. Both complexes are shown to undergo oxidative electropolymerisation, yielding polymer films that retain the redox and optical properties of the monomer. The more soluble analogue 4 is shown to form high quality thin films by spin coating, which have been utilised to fabricate field-effect transistors (FETs) and bulk heterojunction photovoltaic devices (BHJ-PVs). From FET studies, the material shows ambipolar charge transport behaviour, with a maximum carrier mobility of ∼10−6 cm2 V−1s−1 for electrons. By using 4 simultaneously as the electron acceptor as well as a NIR sensitiser in BHJ-PVs, the complex is shown to contribute to the photocurrent, extending light harvesting into the NIR region.
报道了新型吲哚取代的镍二硫烯[Ni(mi-5edt)2](3)的合成及其全面特性,并与之前报道的烷基取代的类似物[Ni(mi-5hdt)2](4)[Dalgleish等,Chem. Commun.,2009,5826][mi-5edt = 1-(N-甲基吲哚-5-基)-乙烯-1,2-二硫醇;mi-5hdt = 1-(N-甲基吲哚-5-基)-己-1-烯-1,2-二硫醇]进行了比较。这两种配合物均表现出氧化电聚合反应,生成的聚合物膜保留了单体的氧化还原和光学性质。溶解性更好的类似物4通过旋涂形成高质量薄膜,这些薄膜已被用于制造场效应晶体管(FETs)和大体积异质结光伏器件(BHJ-PVs)。从FET研究中,该材料显示出双极性载流子传输行为,电子的最大载流子迁移率约为10−6 cm2 V−1s−1。通过同时将4用作BHJ-PVs中的电子受体以及近红外敏化剂,该配合物被证明有助于光电流,将光捕获扩展到近红外区域。