Researchers developed a new process to make flexible transistors from graphene. The new process enable high electron mobility and high frequencies (in the Ghz range). The process uses a graphene in a solution and places it on polyimide substrates.
The idea is to deposit sheets of graphene in solution on the polyimide with an alternating electric field applied between electrodes made in advance. This technique, known as dielectrophoresis or DEP, is used to guide the graphene deposition process so as to obtain a high density of deposited sheets in certain spots. This density is essential for achieving outstanding high-frequency performance.