PdTe2过渡金属硫族化物：化学反应性，热稳定性和设备实现,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

PdTe2过渡金属硫族化物：化学反应性，热稳定性和设备实现
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-11-18 , DOI: 10.1002/adfm.201906556
Gianluca D'Olimpio, Cheng Guo, Chia‐Nung Kuo, Raju Edla, Chin Shan Lue, Luca Ottaviano, Piero Torelli, Lin Wang, Danil W. Boukhvalov, Antonio Politano

二碲化钯（PdTe ₂）是一种新型的过渡金属二卤化物，具有II型狄拉克费米子和拓扑超导性。为了评估其技术潜力，通过表面科学技术，密度泛函理论的补充，对其化学和热稳定性进行了研究，并相继在电子产品中实现，特别是在毫米波接收器中。尽管在室温下水吸附在能量上不利，但由于≈+ 12 kJ mol ^-1的吉布斯自由能微分，但Te空位的存在使PdTe ₂表面变得不稳定，并随着TeO ₂的出现而发生表面氧化。皮肤，即使在空气中放置一年后，其厚度仍保持在亚纳米以下。相应地，测得的基于PdTe ₂的光电器件的光电流在一个月的时间范围内显示可忽略不计的变化（低于4％），从而排除了在纳米制造过程中封装的需求。值得注意的是，在相同的操作条件下，基于PdTe ₂的毫米波接收器的响应度分别比基于黑磷和石墨烯的类似设备高13倍和21倍。还发现原始的PdTe ₂在甚至超过500 K的温度范围内也是热稳定的，从而为基于PdTe ₂的高温电子学铺平了道路。最后，显示TeO ₂ 暴露在空气中形成的皮肤可以通过真空加热进行热还原来去除。

"点击查看英文标题和摘要"

PdTe2 Transition‐Metal Dichalcogenide: Chemical Reactivity, Thermal Stability, and Device Implementation

Palladium ditelluride (PdTe₂) is a novel transition‐metal dichalcogenide exhibiting type‐II Dirac fermions and topological superconductivity. To assess its potential in technology, its chemical and thermal stability is investigated by means of surface‐science techniques, complemented by density functional theory, with successive implementation in electronics, specifically in a millimeter‐wave receiver. While water adsorption is energetically unfavorable at room temperature, due to a differential Gibbs free energy of ≈+12 kJ mol⁻¹, the presence of Te vacancies makes PdTe₂ surfaces unstable toward surface oxidation with the emergence of a TeO₂ skin, whose thickness remains sub‐nanometric even after one year in air. Correspondingly, the measured photocurrent of PdTe₂‐based optoelectronic devices shows negligible changes (below 4%) in a timescale of one month, thus excluding the need of encapsulation in the nanofabrication process. Remarkably, the responsivity of a PdTe₂‐based millimeter‐wave receiver is 13 and 21 times higher than similar devices based on black phosphorus and graphene in the same operational conditions, respectively. It is also discovered that pristine PdTe₂ is thermally stable in a temperature range extending even above 500 K, thus paving the way toward PdTe₂‐based high‐temperature electronics. Finally, it is shown that the TeO₂ skin, formed upon air exposure, can be removed by thermal reduction via heating in vacuum.

更新日期：2020-01-29

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南