Recently, there has been rising interest in perovskite solar cells (PSCs) because of their impressive optoelectronic characteristics, high efficiencies, and low-cost processing, which may contribute to the advancement of renewable energy technology around the globe. p/n homojunctions are one of the most intriguing and forward-looking device architectures available today; p/n homojunctions use sequentially doped p/n layers that replace traditional charge transport layers, which results in improved energy band alignment, charge separation, and minimized recombination losses. This review summarizes and discusses categories, concepts, and processing modes for p/n homojunctions that create both stability and efficiency in the different device types and the operational performance of PSCs. The elements of device performance metrics of, (i) active/absorb layer thickness, (ii) defect density, and (iii) doping density are important to refer to, as they contribute towards creating better photovoltaic performance. The latest development on p/n homojunctions in tandem devices are also reviewed and highlighted with advanced p/n homojunctions in mind. Along with the recent and overall advances related to fabrication via additive, compositional, and molecular engineering, this review seeks to provide a perspective for the further advances of PSCs towards scalable, stable, and commercially viable renewable energy technology. • p/n homojunction architectures replace traditional transport layers, improving band alignment, charge separation, and reducing recombination losses. • Device performance strongly depends on active layer thickness, defect density, and controlled doping concentration in p/n homojunctions. • Recent advances in p/n homojunctions for tandem perovskite devices demonstrate enhanced stability and operational performance. • Additive, compositional, and molecular engineering strategies enable scalable, stable, and commercially viable perovskite solar cells.
Islam et al. (Sun,) studied this question.