On the other hand, in samples optimized for nitrogen reduction, shown in Figure , the signal is maximum in the case 10-90 Cs2AgBiCl6-g-C3N4, which is the one giving the highest NH3 production rate. Opposite to what inferred from Figure , in this case the response is the analogous to that of g-C3N4, but with an enhanced signal. This suggests that ammonia generation happens at graphitic carbon nitride sites, but the concentration of optical excitations in carbon nitride and thus the ammonia generation rate are enhanced by the presence of perovskite with respect to pure g-C3N4.