“RALEIGH, N.C., May 23, 2017 — Use of light to alter the conductivity of semiconductor material could provide a new way to control cell behavior on semiconductors used for bioelectronics. The approach draws on persistent photoconductivity, a phenomenon that causes some materials to become much more conductive when light is shined on them. When conductivity in these materials is elevated, the charge at the surface of the material increases. The escalation in surface charge can be used to direct cells to adhere to the material’s surface.
This image illustrates changes in photocurrent before and after exposure to UV light. Persistent photoconductivity is demonstrated even hours after the UV light has been turned off. This is illustrated by the pictograms showing charge carriers that come into contact with cells at the interface during in vitro experiments. Courtesy of Albena Ivanisevic.
Researchers at North Carolina State University used gallium nitride (GaN), a […]