Hybrid perovskites has shown promising performance for use as solar materials. Their power conversion efficiency has been found to be rising. This notwithstanding the unusual current-voltage hysteresis and low –frequency dielectric response has hampered their widespread applicability. The diffusion of native defect has been suggested as a reason for this. We calculate the halide migration energy in typical hybrid perovskites and identify mechanisms that slow down or reduce the halide migration process. The effect of cation doping was also examined.