“A team of researchers at IMEC, a nonprofit research institute in Leuven, Belgium, have sandwiched a thin, 160-nanometer layer of the organic semiconductor pentacene between layers of aluminum and gold. The device reaches high frequencies by reducing the distance the charge carriers have to travel, says Paul Heremans, who heads the polymer and molecular electronics division at IMEC. The charge carriers in the pentacene layer are known as holes - places in the polymer structure where an electron is missing. The hole appears as a positive charge, and it travels through the material by a kind of domino effect. Rectification results from the fact that electrons from the gold electrode jump into the holes in the pentacene layer easily, while electrons from the aluminum electrode do not.”
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