Scientists construct complementary circuits from organic materials

The circuit diagram and the photograph of a complementary inverter made of one p and one n channel thin film transistor (TFT), i.e. a transistor with either a p or n conductive semiconductor layer. A complementary circuit like this saves energy because in each of the two logical states - either high input energy and low output voltage or the contrary - one or other of the two transistors (p or n) blocks the current flow. This energy saving is an important advantage of complementary circuits as compared to unipolar circuits, which consist of only p channel transistors or n channel transistors. Image: Max Planck Institute for Solid State Research