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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Surface morphologies, electronic structures, and Kondo effect of lanthanide(iii)-phthalocyanine molecules on Au(111) by using STM, STS and FET properties for next generation devices
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Surface morphologies, electronic structures, and Kondo effect of lanthanide(iii)-phthalocyanine molecules on Au(111) by using STM, STS and FET properties for next generation devices

机译：通过使用STM，STS和FET特性为下一代设备设计镧（iii）-酞菁分子在Au（111）上的表面形态，电子结构和近藤效应

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The crystal structures of double-decker single-molecule magnets (SMMs) LnPc_2 (Ln = Tb(iii) and Dy(iii); Pc = phthalocyanine) and non-SMM YPc_2 were determined by using single crystal X-ray diffraction analysis. The compounds are isomorphous to each other. The compounds have metal-centers (M~(3+) = Tb, Dy, and Y) sandwiched by two Pc ligands via eight isoindole-nitrogen atoms in a square-antiprism fashion. The twist angle between the two Pc ligands is 41.4°. Scanning tunneling microscopy (STM) was used to investigate the compounds adsorbed on a Au(111) surface, deposited by using thermal evaporation in ultra-high vacuum. Both MPc_2 with eight-lobes and MPc with four-lobes, which has lost one Pc ligand, were observed. In the scanning tunneling spectroscopy (STS) images of TbPc molecules at 4.8 K, a Kondo peak with a Kondo temperature (T_K) of ～250 K was observed near the Fermi level (V = 0 V). On the other hand, DyPc, YPc and MPc_2 exhibited no Kondo peak. In order to understand the observed Kondo effect, the energy splitting of sublevels in a crystal field should be taken into consideration. As the next step in our studies on the SMM/Kondo effect in Tb-Pc derivatives, we investigated the electronic transport properties of Ln-Pc molecules as the active layer in top- and bottom-contact thin-film organic field effect transistor (OFETs) devices. Tb-Pc molecule devices exhibit p-type semiconducting properties with a hole mobility (μ_H) of ～10~(-4) cm~2 V~(-1) s~(-1). Interestingly, the Dy-Pc based devices exhibited ambipolar semiconducting properties with an electron mobility (μ_e) of ～10~(-5) and a hole mobility (μ_H) of ～10~(-4) cm~2 V~(-1) s~(-1). This behavior has important implications for the electronic structure of the molecules.
机译：通过使用单晶X射线衍射分析确定双层单分子磁体（SMM）LnPc_2（Ln = Tb（iii）和Dy（iii）; Pc =酞菁）和非SMM YPc_2的晶体结构。这些化合物彼此同构。这些化合物具有金属中心（M〜（3+）= Tb，Dy和Y），它们通过两个Pc配位体通过八个异吲哚-氮原子以正方形反棱镜的方式夹在中间。两个Pc配体之间的扭曲角为41.4°。扫描隧道显微镜（STM）用于研究在超高真空中通过热蒸发沉积的Au（111）表面上吸附的化合物。观察到具有八个裂片的MPc_2和具有四个裂片的MPc，它们已经失去了一个Pc配体。在4.8 K的TbPc分子的扫描隧道光谱（STS）图像中，在费米能级附近（V = 0 V）观察到Kondo峰，其Kondo温度（T_K）约为250K。另一方面，DyPc，YPc和MPc_2没有显示近藤峰。为了理解观察到的近藤效应，应考虑晶体场中子能级的能量分裂。在我们研究Tb-Pc衍生物的SMM / Kondo效应的下一步中，我们研究了Ln-Pc分子作为顶部和底部接触薄膜有机场效应晶体管（OFET）的有源层的电子传输特性） 设备。 Tb-Pc分子器件具有p型半导体特性，空穴迁移率（μ_H）为〜10〜（-4）cm〜2 V〜（-1）s〜（-1）。有趣的是，基于Dy-Pc的器件表现出双极性半导体性质，其电子迁移率（μ_e）为〜10〜（-5），空穴迁移率（μ_H）为〜10〜（-4）cm〜2 V〜（-1） ）s〜（-1）。这种行为对分子的电子结构具有重要意义。

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