Advancements in pyridine-based charge transporting materials for perovskite solar cells

The utilization of pyridine derivatives for their donor-acceptor nature has seen an impressive serge in research community over the globe. As these materials offer a variety of applications, ranging from thermally activated delayed fluorescence, organic solar cells, organic light emitting diodes (OLEDs) to even perovskite solar cells (PSCs). These derivatives are well-established as excellent electron transporting materials (ETMs) with better quantum and current efficiency, mainly due to excellent thermal stability of pyridine-based OLEDs devices. Pyridine derivative based hole transporting materials (HTMs) also gained a widespread popularity as charge carriers in PSCs devices. Due to lower quenching of triplet state, uniform thin-films fabrication and low operating voltage, these devices exhibit durable longevity. In this review, we try to connect the structural characteristics and the optoelectrical properties of pyridine-derivatives in PSCs devices. During this journey, we try to highlight recent advancements in designing and synthesizing techniques of pyridine-based derivatives for their improved donor-acceptor nature and their utilization as in HTMs. Those dopants and additive free HTMs could acts as Lewis’s acid-base adduct (LABA) in PSCs assembly, where HTMs interacted with metal-iodide and borane-compound to introduced an interface of metal-iodide/HTMs to boost selectivity towards holes in the device.