[PDF]    http://dx.doi.org/10.3952/lithjphys.48102

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 48, 73–78 (2008)


A ROLE OF PHONON-ASSISTED TUNNELLING IN ELECTRICAL CONDUCTIVITY OF CARBON NANOTUBE NETWORKS*
P. Pipinys and A. Kiveris
Department of Physics, Vilnius Pedagogical University, Studentų 39, LT-08106 Vilnius, Lithuania
E-mail: akiveris@vpu.lt

Received 13 June 2007; revised 28 November 2007; accepted 22 February 2008

High-field transport properties of single-wall carbon nanotubes (SWCNT) are analysed on the basis of phonon-assisted tunnelling (PhAT) model. This model enables one to explain not only the temperature-dependent current–voltage characteristics of SWCNT, but also the crossover from a semiconducting-like temperature dependence conductivity to a metallic-like one as temperature is increased.
Keywords: carbon nanotubes, electrical conduction, phonon-assisted tunnelling
PACS: 73.40.Gk, 73.63.-b, 73.50.Fq, 73.50.-h
*The report presented at the 37th Lithuanian National Physics Conference, 11–13 June 2007, Vilnius, Lithuania.


TUNELINIŲ ŠUOLIŲ, STIMULIUOTŲ GARDELĖS FONONAIS, VAIDMUO ANGLIES NANOVAMZDELIŲ TINKLO ELEKTRINIAME LAIDUME
P. Pipinys, A. Kiveris
Vilniaus pedagoginis universitetas, Vilnius, Lietuva

Pateikiamas įvairių autorių tirtų anglies nanovamzdelių laidumo rezultatų, gautų matuojant laidumo priklausomybes nuo temperatūros ir elektrinio lauko stiprio, palyginimas su teorinėmis krūvininkų tunelinių šuolių, dalyvaujant fononams, tikimybių priklausomybėmis nuo temperatūros ir elektrinio lauko stiprio.
Eksperimento ir teorinių skaičiavimo rezultatų palyginimas leidžia teigti, kad laidumo priklausomybes nuo lauko ir temperatūros nagrinėjamuose dariniuose lemia laisvųjų krūvininkų tunelinė generacija, kurios spartai didelę įtaką turi gardelės vibroninė energija – fononai.
Pateiktasis modelis taip pat paaiškina, kodėl esant aukštesnei temperatūrai stebimas anglies nanovamzdelių elektrinio laidumo virsmas iš puslaidininkinio į metalinį, t. y. neigiamas savitosios varžos temperatūrinis koeficientas virsta teigiamu. Tai įvyksta dėl to, kad pakankamai stipriame lauke ir esant aukštesnei temperatūrai tunelinį procesą lydi fononų emisija.


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