Temperature Dependent Current–Voltage Characteristics of Iron-Phthalocyanine Thin Films
The current–voltage (I–V) characteristics of the crystalline α-phase iron phthalocyanine (FePc) thin films grown by molecular beam epitaxy have been investigated by using a planar geometry in which the metal electrodes are separated by 15 μm. By carrying out the room temperature I–V measurements on vacuum annealed (200 °C for 30 min under 10−6 torr) FePc thin films under vacuum and after exposing them to the air, we demonstrate that the hysteresis in FePc films is intimately related to the filling and de-filling of surface traps created by chemisorbed oxygen. The presence of chemisorbed oxygen has been confirmed by the X-ray photoelectron spectroscopy. Room temperature I–V characteristics of air exposed films showed ohmic conduction in the lower voltage range and space-charge-limited-conductivity (SCLC) in the relatively high voltage. Temperature dependent measurements show that the hysteresis disappears at 250 K and the surface traps are distributed in energy about 0.22 eV deep.
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Document Type: Research Article
Publication date: 2009-09-01
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