A semiconductor system including a planar anode contact, a planar cathode contact, and a volume of n-conductive semiconductor material, which has an anode-side end and a cathode-side end and extends between the anode contact and the cathode contact. A p-conductive area extends from the anode-side end of the volume toward the cathode-side end of the volume without reaching the cathode-side end. The p-conductive area has two sub-areas which are separated from one another in a cross section lying transversely with respect to the anode contact and the cathode contact, which delimit a sub-volume of the volume filled with n-conductive semiconductor material. The sub-volume is open toward the cathode contact, and is delimited by cathode-side ends of the sub-areas. A distance of the two sub-areas defining the opening is smaller than a distance between the two sub-areas prevailing outside of the opening and lying between anode side ends of the sub-areas.