 Lead-free double perovskites are a promising alternative to traditional solar cells due to their unique properties, such as thermodynamic stability, appropriate band gaps, small carrier effective masses, and low exciton binding energies. Despite this, no solar cells based on these materials have yet been reported due to the difficulty in producing them. A new solar cell based on a lead-free double perovskite was recently developed using a low pressure assisted solution process under ambient conditions. This device achieved a power conversion efficiency of 1.44 percent, demonstrating the potential of lead-free perovskites for solar energy applications. Furthermore, the high quality of the film produced and its stability under ambient conditions without encapsulation suggest great promise for lead-free perovskite solar cells. This article was authored by Tsuen Tsuen Wu, Chao Wijong, Yang Lu, and others.