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Najdeno v: ključnih besedah
Povzetek najdenega: ...problemi, brezmrežne metode, kolokacija, multikvadriki, tok kapljevin, transport gibalne tekočine, taljenje, strjevanje, disertacije, ...
Ključne besede: večfizikalni problemi, brezmrežne metode, kolokacija, multikvadriki, tok kapljevin, transport gibalne tekočine, taljenje, strjevanje, disertacije
Objavljeno: 15.10.2013; Ogledov: 4799; Prenosov: 280
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Najdeno v: ključnih besedah
Povzetek najdenega: ...diplomske naloge, podjetja, zunanja oskrba, operativni lizing, transport, ekonomska ocena, ...
Ključne besede: diplomske naloge, podjetja, zunanja oskrba, operativni lizing, transport, ekonomska ocena
Objavljeno: 15.10.2013; Ogledov: 3897; Prenosov: 392
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Najdeno v: ključnih besedah
Ključne besede: grafen, reduciran grafenov oksid, transport naboja, čas preleta, organski tranzistor, adsorbati, dopiranje, zmesi, perileni, politiofeni, grafenski nanotrakovi, disertacije
Objavljeno: 22.01.2015; Ogledov: 4573; Prenosov: 329
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Opis: The electric-charge transport in organic semiconductors is essentially different to the transport in ordered inorganic crystals. The reason is in thelocalization of the energy states, which act as charge-carrier transport channels between molecules. Consequently, the determination of the basic transport parameters in organic materials is inherently more involved than in their inorganic counterparts. The analytical methods that are used to describe charge transport in inorganic materials are unsuitable, since they are based on the extended electronic energy structure. We report here on the simulation of charge transport in organic semiconductor thin films. The simulation is based on the Monte Carlo method and describes the charge-carrier transport within the framework of carrier hopping between the sites. We employed a Gaussian energy distribution of the hopping sites with disorder elements. The degree of disorder is characterized by the width of the Gaussian distribution and is measured in eV units. The results of the transport simulation in 3,4,9,10-perylenedianhydride tetracarboxylic acid (PTCDA) show that the photogenerated charge-carrier current depends on the film thickness, temperature and disorder degree. The simulated photocurrents have the same amplitude in thick films as in the thin films, but the overall shape of the I(t) curve is more dispersive in thin films. The charge-carrier mobility decreases with the increasing degree of disorder at a given temperature. The simulation of the photogenerated positive charge carriers current matches with the time-of-flight experiment in a glass/ITO/PTCDA(600 nm)/In heterostructure at room temperature and an applied bias voltage of 8 V.
Najdeno v: ključnih besedah
Ključne besede: neurejeni kristali, metoda Monte Carlo, organski polprevodniki, transport naboja, PTCDA, tranzientne meritve
Objavljeno: 10.07.2015; Ogledov: 5026; Prenosov: 17
Polno besedilo (0,00 KB)

Opis: We demonstrate that the degree of charge delocalization has a strong impact on polarization energy and thereby on the position of the transport band edge in organic semiconductors. This gives rise to long-range potential fluctuations, which govern the electronic transport through delocalized states in organic crystalline layers. This concept is employed to formulate an analytic model that explains a negative field dependence coupled with a positive temperature dependence of the charge mobility observed by a lateral time-of-flight technique in a high-mobility crystalline organic layer. This has important implications for the further understanding of the charge transport via delocalized states in organic semiconductors.
Najdeno v: ključnih besedah
Ključne besede: organic semiconducotrs, time of flight, transport
Objavljeno: 13.09.2017; Ogledov: 3521; Prenosov: 0
Polno besedilo (374,71 KB)