The aim of the experiment is to test the damage pathways in organic semiconductor under high energy neutron irradiation. In the first experiment we propose to monitor the changes in charge carriers mobility of two conjugated polymers namely poly(3-hexylthiophene) [P3HT] and Poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) [PBTTT] before and after neutron irradiation for as cast and annealed samples (100°C for 10 minutes). In addition we aim to study the possible changes of their optical properties under irradiation.