The invention relates to a liquid-semiconductor neutron detector characterised in that it comprises a hybrid structure consisting of a solid phase and a liquid phase, where the solid phase comprises a substrate of a semiconductor material characterised in that it has a series of grooves along the surface of one of the faces thereof forming an electrode of the detector, and where the liquid phase is contained in said grooves and characterised in that it comprises at least one neutron converter compound containing at least one isotope that is able to capture neutrons and replace them with charged particles suitable for ionising the semiconductor material. The invention also relates to the method for producing said detector and to the use thereof.