The rapid rise in the power conversion efficiency (PCE) of lead (Pb)-based organic-inorganic hybrid perovskite solar cells (from 3 % to 25.2 % ) and recent development in structural and/or environmental stability of the hybrid perovskite by compositional engineering (mixed cation and mixed halides) have brought the technology to a stage for assessment of its commercial viability. Although the moisture-stability of hybrid perovskites has been improved in recent times, low thermal and UV-light stability remains a concern. Poor stability owing to easy release of organic part at elevated temperature, interlayer diffusion of materials causing performance deterioration, and high toxicity of Pb which can cause severe environmental and human health hazards remain huge challenge for commercialization of perovskite solar cells. In this respect, combination of lead-free, all-inorganic and dopant-free device structure can lead to the design of high efficiency as well as long term stable devices. In thistalk, we present strategies to improve main issues in preparation of the photovoltaic films of all-inorganic, bismuth (Bi)-based lead-free perovskite and perovskite-like materials. In addition to this, we will discuss the interfacial engineering strategies to improve the open-circuit voltage (Voc) of lead-perovskite devices that can be significant for tandem device architecture. Further, the present talk will discuss on how we can design methods to prepare high-quality film and defect-free perovskite devices in high (40-50%) and low (10-20%) humidity atmosphere.