Transport mechanisms in Co-doped ZnO (ZCO) and H-irradiated ZCO polycrystalline thin films

Trolio, A. Di; Bonapasta, A. Amore; Barone, C.; Leo, Antonio; Carapella, G.; Pagano, S.; Polimeni, A.; Testa, A. M.

doi:10.1039/d0cp06401g

Cited by 9 publications

(7 citation statements)

References 69 publications

(105 reference statements)

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“…The activation energies and the features of the s curve closely resemble those found for the highly n-doped ZnO sample investigated in our previous study (bottom row in the table). 13 Thus, the same conclusions apply here: two different thermally activated processes govern the charge transport in the HT and LT regimes, respectively. The first one refers to an intra-grain conduction process which arises from mobile electrons in the CB, D-CB process.…”

Section: Zno Films With Different Carrier Densitiessupporting

confidence: 63%

“…The shapes of the curves suggest the occurrence of different thermally activated processes in HT and LT regimes. A natural, first attempt for the investigation of the s behaviour in the whole temperature range has been performed by using the following equation: 13,22,23…”

Section: Zno Films With Different Carrier Densitiesmentioning

confidence: 99%

“…The overall results achieved here for the highly n-doped S1 sample compare well with those found for a similar sample investigated in our previous study. 13 There and here, in the LT regime, both the TE and Mott processes have been ruled out, thus permitting describing the transport behavior in terms of the TAT mechanism. At HT, the S1 E 00 parameter reported above rules out the TE mechanism in favour of the D-CB one, in agreement with our previous results.…”

Section: Highly Doped and Lightly Doped Sample Comparisonmentioning

confidence: 99%

“…12 In a recent study, we investigated transport processes in polycrystalline heavily n-type doped ZnO, Co-doped ZnO and Co-doped and hydrogenated ZnO. 13 The achieved results showed that, in pristine ZnO, Arrhenius thermally activated ig processes, which arise from mobile electrons in the CB, excited to this band from shallow donor states D (D-CB process), dominate at high-temperature (HT), whereas TAT gb processes control the electron transport at low temperature (LT). The same study also gave two interesting suggestions.…”

Section: Introductionmentioning

confidence: 99%

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Role of the carrier density in the transport mechanisms of polycrystalline ZnO films

Trolio

Testa

Bonapasta

2021

Phys. Chem. Chem. Phys.

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Section: Zno Films With Different Carrier Densitiessupporting

confidence: 63%

Section: Zno Films With Different Carrier Densitiesmentioning

confidence: 99%

Section: Highly Doped and Lightly Doped Sample Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of the carrier density in the transport mechanisms of polycrystalline ZnO films

Trolio

Testa

Bonapasta

2021

Phys. Chem. Chem. Phys.

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“…One possible explanation for the observed noise temperature dependence can be found in a theoretical model which ascribes the origin of resistance uctuations to vacancy and interstitial diffusion 22,31 , as already reported for granular and polycrystalline systems 32,33 . This nding gives an indication that above a certain Au layer thickness, here identi ed in 4.5 nm, the conducting regions forming the ultrathin lms are more uniformly distributed and interconnected, despite the possible presence of structural defects at the points of their closest distance.…”

Section: Resultsmentioning

confidence: 55%

Electrical conduction and noise spectroscopy of sodium-alginate gold-covered ultrathin films for flexible green electronics

Barone

Maccagnani

Dinelli

et al. 2022

Preprint

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Green electronics is an emerging topic that requires the exploration of new methodologies for the integration of green components into electronic devices. Therefore, the development of alternative and eco-friendly raw materials, biocompatible and biodegradable, is of great importance. Among these, sodium-alginate is a natural biopolymer extracted from marine algae having a great potential in terms of transparency, flexibility, and conductivity, when functionalized with a thin gold (Au) layer. The electrical transport of these flexible and conducting substrates has been studied, by DC measurements, from 300 to 10 K, to understand the interplay between the organic substrate and the metallic layer. The results were compared to reference bilayers based on polymethyl-methacrylate, a well-known polymer used in electronics. In addition, a detailed investigation of the electric noise properties was also performed. This analysis allows to study the effect of charge carriers fluctuations, providing important information to quantify the minimum metallic thickness required for electronic applications. In particular, the typical noise behavior of metallic compounds was observed in samples covered with 5 nm of Au, while noise levels related to a non-metallic conduction were found for a thickness of 4.5 nm, despite of the relatively good DC conductance of the bilayer.

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Mesoscopic 3D Charge Transport in Solution‐Processed Graphene‐Based Thin Films: A Multiscale Analysis

Boschi

Kovtun

Liscio

et al. 2023

Small

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Graphene and related 2D material (GRM) thin films consist of 3D assembly of billions of 2D nanosheets randomly distributed and interacting via van der Waals forces. Their complexity and the multiscale nature yield a wide variety of electrical characteristics ranging from doped semiconductor to glassy metals depending on the crystalline quality of the nanosheets, their specific structural organization ant the operating temperature. Here, the charge transport (CT) mechanisms are studied that are occurring in GRM thin films near the metal‐insulator transition (MIT) highlighting the role of defect density and local arrangement of the nanosheets. Two prototypical nanosheet types are compared, i.e., 2D reduced graphene oxide and few‐layer‐thick electrochemically exfoliated graphene flakes, forming thin films with comparable composition, morphology and room temperature conductivity, but different defect density and crystallinity. By investigating their structure, morphology, and the dependence of their electrical conductivity on temperature, noise and magnetic‐field, a general model is developed describing the multiscale nature of CT in GRM thin films in terms of hopping among mesoscopic bricks, i.e., grains. The results suggest a general approach to describe disordered van der Waals thin films.

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Transport mechanisms in Co-doped ZnO (ZCO) and H-irradiated ZCO polycrystalline thin films

Abstract: Co doping increases the ZnO resistivity (ρ) at high T (HT), whereas it has an opposite effect at low T (LT). H balances the Co effects by neutralizing the ρ increase at HT and strengthening its decrease at LT.

Cited by 9 publications

References 69 publications

Role of the carrier density in the transport mechanisms of polycrystalline ZnO films

Role of the carrier density in the transport mechanisms of polycrystalline ZnO films

Electrical conduction and noise spectroscopy of sodium-alginate gold-covered ultrathin films for flexible green electronics

Mesoscopic 3D Charge Transport in Solution‐Processed Graphene‐Based Thin Films: A Multiscale Analysis

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