Patent ID: 7982251
Filing Date: 2011-07-19
Classification: B82Y,H01L,Y02E,Y02P,Y10S

Abstract:
1. An electromagnetic radiation detection and storage device comprising a field-effect phototransistor, which comprises: two contact electrodes, namely a source electrode and a drain electrode respectively; a nanostructured electrical conduction unit which is connected to said contact electrodes and is coated with at least one photosensitive polymeric coating capable of absorbing said radiation to be detected, of generating electric charges in response, said charges being detected by said conduction unit, and of storing these charges; and a gate electrode suitable for controlling the electric current in said unit and the spatial distribution of the charges in said photosensitive coating, which gate electrode is separated from said unit by a gate dielectric, characterized in that said conduction unit comprises at least one semiconductor-type nanotube or nanowire capable of delivering an electrical signal representative of a modification in the conductivity of said phototransistor, having been exposed to radiation, and in that said gate dielectric has a thickness e between said contact electrodes and a relative permittivity ∈r that satisfy the condition: ∈r/e≧0.2 nm-1, in such a way that said conductivity after exposure to said radiation can be electrically reset in a minimized time and said device forms at least one imaging pixel and is useable to form a matrix of pixels.