the disclosure is directed to a method and a device for delaying an electrical signal , the method and device being useable in various signal processing applications . a buried channel is formed by disposing a portion of a layer of piezoelectric semiconductor material between confining layers . a surface acoustic wave is established in the piezoelectric semiconductor material . majority carriers are depleted from the channel , and an electrical signal is injected into the channel . a delayed version of the electrical signal , which had been carried along by the surface acoustic wave , can then be extracted from the channel .