We are currently working on the newly emerging solar cell material such as halide perovskites. Perovskites have emerged as outstanding candidates for solar energy conversion with remarkable photoconversion efficiency (30% in 2019). Such materials have recently attracted great attentions from both experimentalists and theorists. Using first principles calculations, we are investigating the optoelectronic and photovoltaic properties of this new and very promising class of materials for designing solar cell devices with superior photovoltaic performances by ascertaining their stability.