For direct separation of primary colors of an imaged scene to be televised, a silicon target structure has on the light-receiving surface thereof an array of groups of picture elements doped with donor and acceptor impurities to give specific sensitivities to the incident light. On the electron-beam surface thereof an array of p-n junctions is formed in correspondence with the array on the light-receiving surface. Minority carriers induced by the shorter wavelength range of the spectrum are repelled by the increasing potential gradient established by the donor impurity and diffuses towards the nearest p-n junction together with other carriers caused by the medium and longer wavelength range of the spectrum. Minority carriers induced by the shorter and medium wavelength range of the spectrum are attracted by the decreasing potential gradient established by the acceptor impurities causing the remaining portions of the carriers to diffuse towards the nearest junctions.
