**4. Conclusion and prospects**

PSCs have been a front runner in competition towards the commercially available photovoltaic technologies. Despite the extensive effort and significant progress in the large area fabrication of perovskite based photovoltaic, the large-area efficiency still lags behind those of small area devices. One of the main reasons for this gap between large and small area PSCs is the difficulty in large area processing of uniform and

high-quality perovskite thin-films. This chapter covers all the solution processing techniques used in the fabrication of perovskite solar cells including the large-area coating techniques. The role of each technique is achieving homogeneous, pinholefree and large grain-sized perovskite thin-films have been explained. The understanding the crystallisation kinetics of perovskite in one or more of these techniques will help in developing commercially viable large-area perovskite based solar modules.