Process for the preparation of a benzoheterodiazole compound disubstituted with benzodithiophene groups which comprises reacting at least one disubstituted benzoheterodiazole compound with at least one monostannylated benzodithiophene compound.Said benzoheterodiazole compound disubstituted with benzodithiophene groups can be advantageously used in the construction of luminescent solar concentrators (LSCs). Furthermore, said benzoheterodiazole compound disubstituted with benzodithiophene groups can be advantageously used in the construction of photovoltaic devices (or solar devices) such as, for example, photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports. Furthermore, said benzoheterodiazole compound disubstituted with benzodithiophene groups can be advantageously used as precursor of monomeric units in the preparation of semiconductor polymers.