Abstract
The role of solvent pH has been an unexplored lever in the formation of high-performance metal halide perovskite films. In this issue of Joule , Noel and coworkers have demonstrated that systematic control over the pH of perovskite precursor solvents can dissolve large colloids, enabling films with reduced defects. Using this method, a perovskite solar cell with a record low open-circuit voltage deficit of 360 mV has been achieved.
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