The Versatility of Polymers in Perovskite Solar Cells

The development of sustainable, cost-effective, and un-depleted energy resources is a demanding challenge for researchers and technologists. Harvesting an abundant source of energy such as solar light is one of the promising ways, to convert sunlight radiation through a semiconductor directly into electricity. Varieties of solar cells based on silicon, thin-film, and emerging solar cells are being developed to address these challenges, and some of them reached market maturity. Emerging solar cells also provide the possibility of manufacturing flexible devices with high efficiency, low materials use, and subsequently low module cost. Among them, perovskite solar cells (PSCs) emerged as being efficient with high potential for a commercial endeavor. Nonetheless, there is a window of opportunity that exists to improve lifetime, photovoltaic (PV) performances, and further reduction of cost, before its commercial viability. Employing polymers is one of the promising strategies to increase the reliability and upgrade the PV performances such as improving fill factor (FF), open-circuit voltage (Voc), short-circuit current density (Jsc), and thus power conversion efficiency (PCE). Here we present recent progress in the use of polymeric materials as hole transporting material (HTM) and electron transporting material (ETM), interfacial layer, and additives into the perovskite, to improve stability and photovoltaic properties