Tuning composition space in lead-free divalent and tetravalent halide perovskite : a critical review

In this review, we have portrayed a comparative analysis between the recent progress of divalent and tetravalent lead-free hybrid perovskites, which have been in the focus of sustainable and green environment as clean energy materials for the last several years. The plethora of such hybrid perovskite materials have been emerged as the promising candidate not only from the review of photovoltaic applications, but also for other optoelectronic...