Electric vehicles will soon dominate the transportation industry. They produce no noise or CO2 emissions; they can even be used in zero-emission mode if charged with renewable energy. Vehicle-integrated photovoltaic (VIPV), or photovoltaic (PV) built into the vehicle’s body, is a ground-breaking strategy for providing this clean energy at the point of consumption. This ability might be explained as having the capacity to increase the operational range and be unrestricted when in the field. Therefore, Solar cells must be highly effective, light, and adaptable to curved surfaces. Perovskite solar cells have been quite popular recently, with their power conversion efficiency (PCE) rising during the past ten years (power conversion efficiency (PCE) 25%). Perovskites are an excellent choice for the upcoming generation of flexible solar cells due to their material flexibility, low cost, and straightforward production techniques. So far, research and development has focused on crystalline solar cells such as Si and the size of a vehicle’s roof. However, a car has a more extensive surface area where the solar cells may theoretically be mounted. It may be possible to implement partially transparent flexible solar cells, such as perovskite solar cells, in transparent places like vehicle windows. This proposal investigates the feasibility and potential of integrating flexible perovskite tandem and multi-junction photovoltaic cells (hereafter referred to as flexible perovskite PV cells) into window film technology for earth (i.e., automotive) and space applications. The study will focus on intensively evaluating these cells’ optical and thermal properties to significantly enhance their performance through improvements in the low-cost, scalable electron transport layer (ETL) use of nanoparticle engineering. Finally, these advancements will facilitate the incorporation of perovskite photovoltaic cells into self-powered sensors, devices, and even electric vehicles (EVs). This integration fosters a more interconnected and sustainable environment for intelligent cities, ultimately paving the way for a cleaner and more resilient future.