Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.40: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

Comparing thickness dependence and transport properties of the organic semiconductors F₁₆CoPc and F₁₆CuPc — •Mareike Dunz, Karsten Rott, Jan Schmalhorst, and Günter Reiss — Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany

Nowadays, organic semiconductors are widely used in OLED and organic photovoltaic systems. However, organic field effect transistors cannot yet compete with silicon based technology as the search for high-mobility and air stable n-channel organic semiconductors goes on. Fluorinated metal phthalocyanines (F₁₆MPc) are considered to be promising candidates due to their high stability and easy synthesis but their carrier mobilities are insufficiently small. Understanding, how different metal center atoms influence the molecules’ properties is a crucial step towards their applicability.

Hence, we prepared organic field effect transistors via thermal evaporation of F₁₆CuPc as well as F₁₆CoPc and investigated their thickness dependencies and transport properties at various temperatures. In situ measurements of the resistance allow for the detection of a thickness dependent source-drain current during the evaporation of the molecules and suggest a thinner conduction channel width for the F₁₆CoPc transistors. Furthermore, we show that oxygen dosing only worsens the performance of transistors with phthalocyanine thicknesses in the regime of the associated channel width, independent of the metal atom. Finally, as F₁₆CoPc features a magnetic center atom, first results of magnetic field dependent measurements are presented.