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Wieland, M.J.J. (author), Kampherbeek, B.J. (author), Kruit, P. (author)An electron source provided with a substrate layer (17) and a semiconductor layer (16) with at least one tip (19), the substrate layer (17) being suitable for receiving light of a first wavelength and transmitting the light to the semiconductor layer (16) that is suitable to convert the light into electrons by a photo-electric effect, the...patent 2002