Photo-excitation intensity dependent electron and hole injections from CH₃NH₃PbI₃ perovskite to nanocrystalline TiO₂ and spiro-OMeTAD are presented with the electron injection yield decrease from 95% to 10% and the hole injection yield decrease from 99% to 50% by increasing the excitation intensity from 10 nJ cm⁻² to 50 μJ cm⁻².