Perovskite solar cells have shown incredible improvement in efficiency in a very short period compared to other light-harvesting materials. Their efficiency has increased from 4% to 25% in a span of 10 years. Various architectures have been proposed for these solar cells; all these architectures use different combinations of electron and hole transport layers. The charge injection kinetics of the perovskite (APbX3) material with various electron and hole transport layers have been studied using the excited-state lifetimes of the charges as a relating parameter. An electron and hole transport layer with the highest injection rate is identified, and an optimum combination of electron and hole transport layer, which gives the best injection efficiency in a perovskite solar cell is proposed. A comparison between the charge injection kinetics of various compositions of standard single perovskite [(MAFA)Pb(IBrCl)3] has also been drawn. The optimum composition of A (MA/FA/Cs) and X (I, Br, Cl) in ABX3, which gives the best injection efficiency, is also proposed. The effect of grain boundaries on the rate of injection is also studied by comparing the lifetime of a film and a crystal of perovskite. Perovskite solar cells have been fabricated using the optimum composition of A (MA/FA/Cs) and X (I, Br, Cl) in ABX3 and the optimum combination of the Electron and Hole transport layer found out from the above experiments.