Flexible transistors have been made in the lab before but the process to deposit semiconductors on a flexible substrate required a vacuum to evaporate all but the desired portions of the layers laid on that substrate. This new technique utilizes the same materials for insulators and semiconductors but the process uses inks and a photoresist mask to ensure the correct placement of a layer of conductive silver nanocrystals for the gate. Over top opf the later of silver a layer of aluminium-oxide is added as the insulator, then cadmium-selenide quantum dots for the semiconductor channel and then another layer of silver nanocrystals and indium nanocrystals for the drain. This is baked as you would normally treat transistors to dope the semiconductor channel and you end up with working FETs on a flexible substrate. Check out more details on the process at Nanotechweb.
"A high-quality, flexible transistor, made entirely from colloidal nanocrystals, has been developed by a team in the US. By sequentially depositing their components in the form of nanocrystal "inks," the researchers could make transistors using standard industrial methods, without the need for high-temperature, high-vacuum specialist equipment."
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