PhD ceremony: E.C.P. Smits, 16.15 uur, Academiegebouw, Broerstraat 5, Groningen
Thesis: Ambipolar and self-assembled organic electronics
Promotor(s): prof. D.M. de Leeuw, prof. P.W.M. Blom, prof. B. de Boer
Faculty: Mathematics and Natural Sciences
‘Organic electronics’ is electronics where the active material is replaced by an organic semiconductor. Research in the field of organic electronics generally focuses on p-type semiconductors. However to improve organic circuitry n-type semiconductors are required. For this reason there is also a growing interest in ambipolar transistors. Ambipolar semiconductors support both p-type or n-type conductivity. In the first part of this thesis a model is developed to describe the current voltage characteristics of ambipolar transistors. Excellent agreement between theory and experimental data is observed. In certain cases ambipolar transistors can exhibit light emission by charge recombination in the channel. This phenomenon has been studied in various ways. Finally CMOS-like integrated circuits are demonstrated by combining ambipolar transistors into ring oscillators.
In the second part of the thesis electronics fabricated through self-assembly is demonstrated. First the charge transport through self-assembled monolayers (SAMs) is studied. We demonstrate a technology to fabricate molecular junctions on a 150mm wafers. The large-scale fabrication of molecular junctions has given new insights in the charge transport properties of molecular junctions. In addition integrated circuits based on self-assembled monolayer field-effect transistors (SAMFETs), where the semiconductor spontaneously forms a monolayer on the gate dielectric, is demonstrated. As a first step 300 SAMFETs are combined into a 15 bit code generator.
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