Patent ID: 8795503

Claim:
A device to conduct an electrochemical reaction on a surface of a semiconductor substrate (S), characterized in that the device comprises: a container ( 10 ) intended to contain an electrolyte (E); a support ( 20 ) arranged in the container ( 10 ), said support ( 20 ) being adapted for attachment of the semiconductor substrate (S) onto said support ( 20 ); a counter-electrode ( 30 ) arranged in the container ( 10 ), the counter-electrode ( 30 ) being ring-shaped and having a central opening; illumination means ( 50 ) arranged in the container ( 10 ) and positioned co-axially with and coplanar with the central opening of the counter-electrode ( 30 ), said illumination means ( 50 ) comprising: (i) a light source ( 51 ) emitting light rays, the light source ( 51 ) being arranged relative to the counter-electrode ( 30 ) such that emitted light rays travel substantially through the central opening of the counter-electrode ( 30 ); and (ii) a light diffusing shield ( 52 ) to homogenize the emitted light rays on all of said surface of said semiconductor substrate (S) so as to activate said surface; and an electric power supply ( 40 ) comprising connection means for connection to the semiconductor substrate (S) and to the counter-electrode ( 30 ) in order to polarize said surface of said semiconductor substrate (S) at an electric potential permitting the electrochemical reaction.