Researchers from the USC Viterbi School of Engineering have developed a flexible, energy-efficient hybrid circuit combining carbon nanotube thin film transistors with other thin film transistors. The hybrid could take the place of silicon as the traditional transistor material used in electronic chips, since carbon nanotubes are more transparent, flexible, and can be processed at a lower cost.
The hybridization of carbon nanotube thin films and IGZO (indium, gallium and zinc oxide) thin films was achieved by combining their types, p-type and n-type, respectively, to create circuits that can operate complimentarily, reducing power loss and increasing efficiency. The inclusion of IGZO thin film transistors provided power efficiency to increase battery life.
The potential applications for the integrated circuitry are numerous, including Organic Light Emitting Diodes (OLEDs), digital circuits, radio frequency identification (RFID) tags, sensors, wearable electronics, and flash memory devices. Even heads-up displays on vehicle dashboards could soon be a reality.
The new technology also has major medical implications. Currently, memory used in computers and phones is made with silicon substrates, the surface on which memory chips are built. To obtain medical information from a patient such as heart rate or brainwave data, stiff electrode objects are placed on several fixed locations on the patient’s body. With the new hybridized circuit, however, electrodes could be placed all over the patient’s body with just a single large but flexible object.
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