The invention concerns a phase plate, in particular for an electron microscope, which is disposed in an electron beam path (4), comprises at least one thin film (8, 8a-h), which thin film is at least partially permeable to electron beams, wherein the thin film (8, 8a-h) comprises electrically conductive material, is connected to a predeterminable electrical voltage (12, 12a-e) and is equipped with at least one through-hole (9, 9a-c).