Environmentally Controlled Charge Carrier Injection Mechanisms of Metal/WS2 Junctions
Environmentally Controlled Charge Carrier Injection Mechanisms of Metal/WS2 Junctions
复制标题
DOI：
10.1021/acs.jpclett.9b00862
复制
发表时间：
2019-05-16
影响因子：
5.7
通讯作者：
Bampoulis, Pantelis
中科院分区：
文献类型：
--
作者：
van Bremen, Rik;Vonk, Kevin;Bampoulis, Pantelis
在这里，我们报告了一种新颖的、无创的方法，用于操作剪裁金属/WS2接触的电荷输运性质，而不会对传统掺杂方法产生的二维材料产生负面影响。由云母和WS2之间水化层的存在引起的局部电荷变化，会影响支撑在绝缘云母上的WS2薄片的掺杂水平。通过使用几种互补扫描探针技术，我们证明了直接控制这种插层水膜的状态和厚度可以控制Pt/WS2纳米触点的电荷注入特性。通过环境控制插层水的厚度，实现了从单极到双极运输的转换。我们表明，这种效应即使在多层薄片中也会持续存在，并且它是完全可逆的，这为实现具有环境可控功能的新型电子产品开辟了一条新途径。
Here we report on a novel, noninvasive route for operando tailoring of the charge transport properties of metal/WS2 contacts without the negative impacts to two-dimensional materials arising from conventional doping methods. The doping level of thin WS2 flakes supported on insulating mica is susceptible to local charge variations induced by the presence of a hydration layer between mica and WS2. We demonstrate, via the use of several complementary scanning probe techniques, that the direct control of the state and thickness of this intercalated water film controls the charge injection properties of Pt/WS2 nanocontacts. A switch from unipolar to ambipolar transport was achieved by environmentally controlling the thickness of the intercalated water. We show that the effect persists even for multilayer flakes and that it is completely reversible, opening a new route toward the realization of novel electronics with environmentally controllable functionalities.