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Boschi A, Kovtun A, Liscio F, Xia Z, Kim KH, Avila SL, De Simone S, Mussi V, Barone C, Pagano S, Gobbi M, Samorì P, Affronte M, Candini A, Palermo V, Liscio A. Mesoscopic 3D Charge Transport in Solution-Processed Graphene-Based Thin Films: A Multiscale Analysis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2303238. [PMID: 37330652 DOI: 10.1002/smll.202303238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/05/2023] [Indexed: 06/19/2023]
Abstract
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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Affiliation(s)
- Alex Boschi
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività, (CNR-ISOF), via Gobetti 101, Bologna, 40129, Italy
- Istituto Italiano di Tecnologia, IIT - CNI, Laboratorio NEST, piazza S. Silvestro 12, Pisa, 56127, Italy
| | - Alessandro Kovtun
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività, (CNR-ISOF), via Gobetti 101, Bologna, 40129, Italy
| | - Fabiola Liscio
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) - Bologna Unit, via Gobetti 101, Bologna, 40129, Italy
| | - Zhenyuan Xia
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività, (CNR-ISOF), via Gobetti 101, Bologna, 40129, Italy
- Chalmers University of Technology, Department of Industrial and Materials Science, Kemivägen 9, Gothenburg, 41296, Sweden
| | - Kyung Ho Kim
- Chalmers University of Technology, Department of Microtechnology and Nanoscience, Kemivägen 9, Gothenburg, 41296, Sweden
- Physics Department, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK
| | - Samuel Lara Avila
- Chalmers University of Technology, Department of Microtechnology and Nanoscience, Kemivägen 9, Gothenburg, 41296, Sweden
| | - Sara De Simone
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) - Roma Unit, via del Fosso del Cavaliere 100, Roma, 00133, Italy
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) - Lecce Unit, SP Lecce-Monteroni km 1,200, Lecce, 73100, Italy
| | - Valentina Mussi
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) - Roma Unit, via del Fosso del Cavaliere 100, Roma, 00133, Italy
| | - Carlo Barone
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, Via Giovanni Paolo II 132, Fisciano, SA, 84084, Italy
- CNR-SPIN Salerno and INFN Gruppo Collegato di Salerno, c/o Università degli Studi di Salerno, Fisciano, SA, 84084, Italy
| | - Sergio Pagano
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, Via Giovanni Paolo II 132, Fisciano, SA, 84084, Italy
- CNR-SPIN Salerno and INFN Gruppo Collegato di Salerno, c/o Università degli Studi di Salerno, Fisciano, SA, 84084, Italy
| | - Marco Gobbi
- CIC nanoGUNE, Tolosa Hiribidea 76, Donostia - San Sebastian, E-20018, Spain
| | - Paolo Samorì
- Université de Strasbourg, CNRS, ISIS, 8 allée Gaspard Monge, Strasbourg, 67000, France
| | - Marco Affronte
- Dipartimento di Scienze Fisiche, Informatiche e Matematiche (FIM), via Giuseppe Campi 213/a, Modena, 41125, Italy
| | - Andrea Candini
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività, (CNR-ISOF), via Gobetti 101, Bologna, 40129, Italy
| | - Vincenzo Palermo
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività, (CNR-ISOF), via Gobetti 101, Bologna, 40129, Italy
| | - Andrea Liscio
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) - Roma Unit, via del Fosso del Cavaliere 100, Roma, 00133, Italy
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Superconducting- and Graphene-Based Devices. NANOMATERIALS 2022; 12:nano12122055. [PMID: 35745392 PMCID: PMC9229232 DOI: 10.3390/nano12122055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 06/10/2022] [Indexed: 12/10/2022]
Abstract
This Special Issue has been organized to collect new or improved ideas regarding the exploitation of superconducting materials, as well as graphene, aiming to develop innovative devices [...].
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Barone C, Cirillo C, Carapella G, Granata V, Santoro D, Attanasio C, Pagano S. Effect of the substrate on the electrical transport and fluctuation processes in NbRe and NbReN ultrathin films for superconducting electronics applications. Sci Rep 2022; 12:1573. [PMID: 35091643 PMCID: PMC8799732 DOI: 10.1038/s41598-022-05511-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 01/07/2022] [Indexed: 11/30/2022] Open
Abstract
NbRe-based superconducting thin films recently received relevant interest in the field of low-temperature electronics. However, for these materials the electrical conduction mechanisms, in particular in the normal state, still need to be investigated in more detail. Here, NbRe and NbReN films of different thicknesses have been deposited on two different substrates, namely monocrystalline Si and [Formula: see text] buffered Si. The films were characterized by DC electrical transport measurements. Moreover, a connection with the charge carriers fluctuation processes has been made by analyzing the electrical noise generated in the normal state region. Despite the films morphology seems not to be affected by the substrate used, a lower noise level has been found for the ones grown on [Formula: see text], in particular for NbReN. From this study it emerges that both NbRe and NbReN ultrathin films are of very good quality, as far as the low-temperature electrical noise and conduction are concerned, with noise levels competitive with NbN. These results may further support the proposal of using these materials in a nanowire form in the field of superconducting electronics.
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Affiliation(s)
- C Barone
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy.
- CNR-SPIN, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy.
- INFN Gruppo Collegato di Salerno, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy.
| | - C Cirillo
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
- CNR-SPIN, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
| | - G Carapella
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
- CNR-SPIN, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
- INFN Gruppo Collegato di Salerno, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
| | - V Granata
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
- CNR-SPIN, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
| | - D Santoro
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
| | - C Attanasio
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
- CNR-SPIN, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
- INFN Gruppo Collegato di Salerno, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
| | - S Pagano
- Dipartimento di Fisica "E.R. Caianiello", Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
- CNR-SPIN, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
- INFN Gruppo Collegato di Salerno, c/o Università degli Studi di Salerno, 84084, Fisciano, Salerno, Italy
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Electric Transport in Gold-Covered Sodium-Alginate Free-Standing Foils. NANOMATERIALS 2021; 11:nano11030565. [PMID: 33668347 PMCID: PMC7996263 DOI: 10.3390/nano11030565] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 02/20/2021] [Accepted: 02/21/2021] [Indexed: 11/16/2022]
Abstract
The electric transport properties of flexible and transparent conducting bilayers, realized by sputtering ultrathin gold nanometric layers on sodium-alginate free-standing films, were studied. The reported results cover a range of temperatures from 3 to 300 K. In the case of gold layer thicknesses larger than 5 nm, a typical metallic behavior was observed. Conversely, for a gold thickness of 4.5 nm, an unusual resistance temperature dependence was found. The dominant transport mechanism below 70 K was identified as a fluctuation-induced tunneling process. This indicates that the conductive region is not continuous but is formed by gold clusters embedded in the polymeric matrix. Above 70 K, instead, the data can be interpreted using a phenomenological model, which assumes an anomalous expansion of the conductive region upon decreasing the temperature, in the range from 300 to 200 K. The approach herein adopted, complemented with other characterizations, can provide useful information for the development of innovative and green optoelectronics.
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Di Trolio A, Amore Bonapasta A, Barone C, Leo A, Carapella G, Pagano S, Polimeni A, Testa AM. Transport mechanisms in Co-doped ZnO (ZCO) and H-irradiated ZCO polycrystalline thin films. Phys Chem Chem Phys 2021; 23:2368-2376. [PMID: 33449979 DOI: 10.1039/d0cp06401g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In the present study, the electrical resistivity (ρ) as a function of the temperature (T) has been measured in polycrystalline ZnO, Co-doped ZnO (ZCO) and H irradiated ZCO (HZCO) samples, in the 300-20 K range. The achieved results show impressive effects of Co doping and H irradiation on the ZnO transport properties. The Co dopant increases the ZnO resistivity 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. A careful analysis of the ρ data permits to identify two different thermally activated processes as those governing the charge transport in the three materials at HT and LT, respectively. The occurrence of such processes has been fully explained in terms of a previously proposed model based on an acceptor impurity band, induced by the formation of Co-oxygen vacancy complexes, as well as known effects produced by H on the ZnO properties. The same analysis shows that both Co and H reduce the effects of grain boundaries on the transport processes. The high conductivity of HZCO in the whole T-range and its low noise level resulting from electric noise spectroscopy make this material a very interesting one for technological applications.
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Affiliation(s)
- A Di Trolio
- CNR-Istituto di Struttura della Materia, U.O.S. di Tor Vergata, Via del fosso del cavaliere 100, 00133 Roma, Italy.
| | - A Amore Bonapasta
- CNR-Istituto di Struttura della Materia, Via Salaria Km. 29,300, 00015 Monterotondo St., Roma, Italy
| | - C Barone
- Dipartimento di Fisica "E.R. Caianiello", Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy.,CNR-SPIN, c/o Università degli Studi di Salerno, 84084 Fisciano (SA), Italy
| | - A Leo
- Dipartimento di Fisica "E.R. Caianiello", Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
| | - G Carapella
- Dipartimento di Fisica "E.R. Caianiello", Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
| | - S Pagano
- Dipartimento di Fisica "E.R. Caianiello", Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy.,CNR-SPIN, c/o Università degli Studi di Salerno, 84084 Fisciano (SA), Italy
| | - A Polimeni
- Dipartimento di Fisica, Sapienza Università di Roma, P.le A. Moro 2, 00185 Roma, Italy
| | - A M Testa
- CNR-Istituto di Struttura della Materia, Via Salaria Km. 29,300, 00015 Monterotondo St., Roma, Italy
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Abstract
Electric noise spectroscopy is a non-destructive and a very sensitive method for studying the dynamic behaviors of the charge carriers and the kinetic processes in several condensed matter systems, with no limitation on operating temperatures. This technique has been extensively used to investigate several perovskite compounds, manganese oxides (La1−xSrxMnO3, La0.7Ba0.3MnO3, and Pr0.7Ca0.3MnO3), and a double perovskite (Sr2FeMoO6), whose properties have recently attracted great attention. In this work are reported the results from a detailed electrical transport and noise characterizations for each of the above cited materials, and they are interpreted in terms of specific physical models, evidencing peculiar properties, such as quantum interference effects and charge density waves.
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Iron-Based Superconducting Nanowires: Electric Transport and Voltage-Noise Properties. NANOMATERIALS 2020; 10:nano10050862. [PMID: 32365791 PMCID: PMC7711438 DOI: 10.3390/nano10050862] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/15/2020] [Accepted: 04/20/2020] [Indexed: 12/01/2022]
Abstract
The discovery of iron-based superconductors paved the way for advanced possible applications, mostly in high magnetic fields, but also in electronics. Among superconductive devices, nanowire detectors have raised a large interest in recent years, due to their ability to detect a single photon in the visible and infrared (IR) spectral region. Although not yet optimal for single-photon detection, iron-based superconducting nanowire detectors would bring clear advantages due to their high operating temperature, also possibly profiting of other peculiar material properties. However, there are several challenges yet to be overcome, regarding mainly: fabrication of ultra-thin films, appropriate passivation techniques, optimization of nano-patterning, and high-quality electrical contacts. Test nanowire structures, made by ultra-thin films of Co-doped BaFe2As2, have been fabricated and characterized in their transport and intrinsic noise properties. The results on the realized nanostructures show good properties in terms of material resistivity and critical current. Details on the fabrication and low temperature characterization of the realized nanodevices are presented, together with a study of possible degradation phenomena induced by ageing effects.
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