"We should also push ahead in a long-term way the work of pushing back the frontiers of science and technology."
One of the effective ways of improving the performance of perovskite solar cells (PSCs) is using ionic liquids to control the crystal growth of the perovskite.
In this work, the effect of the ionic liquid methylammonium acetate (MAAc) on the crystal growth of the perovskite and the power conversion efficiency (PCE) of hole-transport material-free PSCs with carbon electrodes were observed. We found that, when perovskite was produced from a solid-gas reaction of dimethylammonium lead iodide (DMAPbI3) with methylamine, the addition of ionic liquid to the DMAPbI3 precursor solution causes the crystallitic size of the resulting perovskite to increase, improving the crystallinity and light absorbability of the perovskite film. The PCE of the device fabricated by adding 5% MAAc to the DMAPbI3 precursor solution was 14.82%. The result of our analysis showed that the performance of the device was increased by the addition of ionic liquid, due to reduction of the nonradiative recombination and enlargement of the charge recombination resistance.
Our group published our results in Journal of Electronic Materials, an international academic journal under the title of "Effect of Ionic Liquid Methylammonium Acetate on the Performance of Hole‑Transport Material‑Free Mesoporous Perovskite Solar Cells with Carbon Electrode" (https://doi.org/10.1007/s11664-022-09944-6).