In this work the purpose of the simulations is to optimize a new large volume Silicon Carbide (SiC) detector for 14.1 MeV neutrons. The device has an active thickness obtained by epitaxial growth and an active area of 25 mm2. In the first step of the simulations we compare SiC detector performance to Diamond and Silicon detectors, with the same geometric features. In the second step of the simulations we have found the best solution to improve the response of the detector for a fixed epitaxial layer thickness using an overlayer of aniline (C6H7N).