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2006 | 4 | 1 | 87-104
Tytuł artykułu

Ac electrical parameters of Al-ZnPc-Al organic semiconducting films

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The ac electrical parameters of thermally evaporated zinc phthalocyanine, ZnPc, semiconducting thin films was measured in the temperature range of 180–390 K and frequency between 0.1 and 20 kHz. Aluminum electrode contacts were utilized to sandwich the organic ZnPc semiconducting films. Capacitance and loss tangent decreased rapidly with frequency at high temperatures, but at lower temperatures a weak variation is observed. An equivalent circuit model assuming ohmic contacts could qualitatively and successfully explains capacitance and loss tangent behavior. The ac conductivity showed strong dependence on both temperature and frequency depending on the relevant temperature and frequency range under consideration. Ac conductivity σ (ω) is found to vary with ω, as ω s with the index s ≤ 1.35 suggesting a dominant hopping conduction process at low temperatures (< 250 K) and high frequency. The conductivity of some samples did not increase monotonically with temperature. This behavior was attributed to oxygen exhaustion of the sample as its temperature is increased. The ac conductivity behavior at low temperatures of ZnPc films could be described well by Elliott model assuming hopping of charge carriers between localized sites.
Wydawca

Czasopismo
Rocznik
Tom
4
Numer
1
Strony
87-104
Opis fizyczny
Daty
wydano
2006-03-01
online
2006-03-01
Twórcy
  • Physics Department, College of Science and Technology, Al-Quds University, Jerusalem, P.O. Box 20002, West Bank, Palestine via, Israel
  • Physics Department, College of Science and Technology, Al-Quds University, Jerusalem, P.O. Box 20002, West Bank, Palestine via, Israel, asaleh@science.alquds.edu
autor
  • Thin Films Laboratory, Physics Department, Keele University, Keele, Staffordshire, ST5 5BG, UK
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
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