Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.53: Poster

Montag, 12. März 2018, 17:30–19:30, Poster B

In situ transport measurements in organic field effect transistors with F₁₆CuPc — •Mareike Dunz, Karsten Rott, Jan Schmalhorst, and Günter Reiss — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany

Organic semiconductors are widely used in OLED and organic photovoltaic systems. However, organic field effect transistors cannot yet compete with silicon based technology due to their low charge carrier mobility. Fluorinated copper phtalocyanine (F₁₆CuPc) is reported to be one of the rare air-stable n-channel organic semiconductors that can be considered for transistor applications [1].

We prepared organic field effect transistors with thermally evaporated F₁₆CuPc on oxidized silicon substrates in a bottom contact configuration. Electrical in situ measurements allow for the detection of a thickness dependent source-drain current during the evaporation of the organic molecules. We found a maximum of the source-drain current around a thickness of 20 nm. Subsequent temperature dependent measurements of the electron mobility in the range from −150 ^∘C to 150 ^∘C reveal charge transport via the hopping mechanism. At room temperature, the electron mobility is determined to lie around 2−8·10⁻³ cm²/Vs, depending on the applied gate voltage. Furthermore, we show how those transistors react when exposing them to gases like oxygen.
[1] Z. Bao et al., J. Am. Chem. Soc. 7863(23), 207 (1998)