Highly conductive PdCoO2 ultrathin films for transparent electrodes
Highly conductive PdCoO2 ultrathin films for transparent electrodes
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DOI：
10.1063/1.5027579
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发表时间：
2018-04-01
期刊：
影响因子：
6.1
通讯作者：
Tsukazaki, A.
中科院分区：
文献类型：
--
作者：
Harada, T.;Fujiwara, K.;Tsukazaki, A.
报道了用脉冲激光沉积法在Al_2O_3(0001)衬底上成功地制备了高导电性的PdCoO_2超薄膜。薄膜沿PdCoO2的层状钙钛矿结构的c轴生长，对应于导电Pd层和CoO2八面体的交替堆积。厚度依赖的输运测量表明，在厚度超过临界厚度2.1 nm的样品中，每个Pd层具有高达5.5ms的均匀片状电导。即使在临界厚度下，电导率也超过了10(4)S厘米(-1)。PdCoO2薄膜的光学透过率光谱表现出很高的光学透明度，特别是在近红外区。伴随而来的高电导率和光学透过率使得PdCoO2超薄膜有望成为三角晶格材料的透明电极。(C)2018年作者(S)。
We report on the successful synthesis of highly conductive PdCoO2 ultrathin films on Al2O3 (0001) by pulsed laser deposition. The thin films grow along the c-axis of the layered delafossite structure of PdCoO2, corresponding to the alternating stacking of conductive Pd layers and CoO2 octahedra. The thickness- dependent transport measurement reveals that each Pd layer has a homogeneous sheet conductance as high as 5.5 mS in the samples thicker than the critical thickness of 2.1 nm. Even at the critical thickness, high conductivity exceeding 10(4) S cm(-1) is achieved. Optical transmittance spectra exhibit high optical transparency of PdCoO2 thin films particularly in the near- infrared region. The concomitant high values of electrical conductivity and optical transmittance make PdCoO2 ultrathin films promising transparent electrodes for triangular- lattice- based materials. (C) 2018 Author(s).