MoO3 induces p-type surface conductivity by surface transfer doping in diamond

Xing, Kaijian; Xiang, Yang; Jiang, Ming; Creedon, Daniel L.; Akhgar, Golrokh; Yianni, Steve A.; Xiao, Haiyan; Ley, L.; Stacey, Alastair; McCallum, Jeffrey C.; Zhuiykov, Serge; Pakes, C. I.; Qi, Dongchen

doi:10.1016/j.apsusc.2019.144890

Cited by 34 publications

(43 citation statements)

References 39 publications

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“…[ 35,36 ] Furthermore, their local presence has been showed to induce p‐type doping. [ 37,38 ] Therefore thin Mo oxide patches if present onto thick MoS 2 crystals are expected to modify their electrical properties and produce p–n junctions arising in situ even onto thick MoS 2 flakes, which are still nanoscopic in size, but thick enough (more than 10–15 monolayers) to show bulk MoS 2 electrical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Direct Identification of Surface Bound MoO₃ on Single MoS₂ Flakes Heated in Dry and Humid Air

Rogala

Sokołowski

Ukegbu

et al. 2021

Adv Materials Inter

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The chemical presence of the MoOx species on single microscopic MoS2 flakes is shown at two conditions, which are of interest for future MoS2‐based devices and where their presence is not previously confirmed. First, the case of thick MoS2 flakes oxidatively etched at 350–370 °C in air is treated. Atomic force microscopy (AFM), high resolution X‐ray photoelectron spectroscopy, and X‐ray absorption spectroscopy are combined to unambiguously confirm the chemical presence of the α‐MoO3 species on such samples, mostly in the form of loose particles. Second, it is shown that MoS2 flakes heated at temperatures of only 220 °C display a quite uniform ≈2 nm thick MoOx layer at already 10% relative humidity. The presence of such MoOx oxide layers is confirmed by scratching the sample with AFM tips and performing comparative Kelvin probe force microscopy and Auger photoelectron spectroscopy on scratched‐out and untouched parts of the flakes.

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Section: Introductionmentioning

confidence: 99%

Direct Identification of Surface Bound MoO₃ on Single MoS₂ Flakes Heated in Dry and Humid Air

Rogala

Sokołowski

Ukegbu

et al. 2021

Adv Materials Inter

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“…Nonstoichiometric-reduced MoO x (2 < x < 3) oxides are more conductive, and eventually MoO 2 is semi-metallic [50]. In addition, thin Mo oxide layers are expected to differ in their electrical properties, depending on their thickness and degree of crystallinity [50,91], and small amounts of α-MoO 3 can induce p-type doping [92,93]. Therefore, thin Mo oxide patches, if present on the MoS 2 crystals, are expected to modify their electrical properties and even help in creation electronic p-n junctions in situ, which are nanoscopic in size.…”

Section: Mo Oxides and Their Derivatives In Mos 2 Oxidationmentioning

confidence: 99%

Local Interactions of Atmospheric Oxygen with MoS2 Crystals

Szoszkiewicz

2021

Materials

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Thin and single MoS2 flakes are envisioned to contribute to the flexible nanoelectronics, particularly in sensing, optoelectronics and energy harvesting. Thus, it is important to study their stability and local surface reactivity. Their most straightforward surface reactions in this context pertain to thermally induced interactions with atmospheric oxygen. This review focuses on local and thermally induced interactions of MoS2 crystals and single MoS2 flakes. First, experimentally observed data for oxygen-mediated thermally induced morphological and chemical changes of the MoS2 crystals and single MoS2 flakes are presented. Second, state-of-the-art mechanistic insight from computer simulations and arising open questions are discussed. Finally, the properties and fate of the Mo oxides arising from thermal oxidation are reviewed, and future directions into the research of the local MoS2/MoOx interface are provided.

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“…High electron affinity metal oxides have been utilised as surface acceptor materials in order to improve the device stability and enhance the carrier concentration in the surface transfer doped H-diamond. Two of the metal oxides that have been shown in previous experimental studies to improve the performance and stability of STD in H-diamond are MoO 3 and V 2 O 5 [13,14,[20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Surface Transfer Doping of Hydrogenated Diamond by MoO3 and V2O5 Metal Oxides

McGhee

Georgiev

2020

Micromachines

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In this work, we investigate the surface transfer doping process that is induced between hydrogen-terminated (100) diamond and the metal oxides, MoO3 and V2O5, through simulation using a semi-empirical Density Functional Theory (DFT) method. DFT was used to calculate the band structure and charge transfer process between these oxide materials and hydrogen terminated diamond. Analysis of the band structures, density of states, Mulliken charges, adsorption energies and position of the Valence Band Minima (VBM) and Conduction Band Minima (CBM) energy levels shows that both oxides act as electron acceptors and inject holes into the diamond structure. Hence, those metal oxides can be described as p-type doping materials for the diamond. Additionally, our work suggests that by depositing appropriate metal oxides in an oxygen rich atmosphere or using metal oxides with high stochiometric ration between oxygen and metal atoms could lead to an increase of the charge transfer between the diamond and oxide, leading to enhanced surface transfer doping.

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MoO3 induces p-type surface conductivity by surface transfer doping in diamond

Cited by 34 publications

References 39 publications

Direct Identification of Surface Bound MoO₃ on Single MoS₂ Flakes Heated in Dry and Humid Air

Direct Identification of Surface Bound MoO₃ on Single MoS₂ Flakes Heated in Dry and Humid Air

Local Interactions of Atmospheric Oxygen with MoS2 Crystals

Simulation Study of Surface Transfer Doping of Hydrogenated Diamond by MoO3 and V2O5 Metal Oxides

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MoO3 induces p-type surface conductivity by surface transfer doping in diamond

Cited by 34 publications

References 39 publications

Direct Identification of Surface Bound MoO3 on Single MoS2 Flakes Heated in Dry and Humid Air

Direct Identification of Surface Bound MoO3 on Single MoS2 Flakes Heated in Dry and Humid Air

Local Interactions of Atmospheric Oxygen with MoS2 Crystals

Simulation Study of Surface Transfer Doping of Hydrogenated Diamond by MoO3 and V2O5 Metal Oxides

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Direct Identification of Surface Bound MoO₃ on Single MoS₂ Flakes Heated in Dry and Humid Air

Direct Identification of Surface Bound MoO₃ on Single MoS₂ Flakes Heated in Dry and Humid Air