Abstract
<p indent=0mm>The stability of perovskite precursor solution which is very important for device efficiency, stability and consistency has been neglected for a long time. In methylamine-formamidine complex perovskite solution, the instability of solution is mainly caused by the deprotonation of methylammonium iodide and its derived side reaction. In order to improve the stability of the solution, we systematically studied the influence of different acid additives on the balance of deprotonation and trans-methylimine reaction, and found that boric acid was the best additive. As a Lewis acid, boric acid has sp<sup>2</sup> hybrid boron atoms which could accept a lone pair of electrons, thus forming coordination bonds. In the mixed organic cationic perovskite solution, there is a strong coordination interaction between B and I<sup>−</sup>, which can effectively inhibit the deprotonation of methylamine iodide and the transimine reaction of methylamine and formamidine iodide, resulting in a 97.9% reduction in the generated by-products. Perovskite films and devices prepared by the solution with boric acid stabilizer after aging for different times have good repeatability and consistency, which is particularly important for the commercialization of perovskite solar cells.
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