Improving the stability and optical properties of CsPbI3 perovskite nanocrystals by 1-Octadecanethiol through surface modification

As traditional capping ligands like oleic acid (OA) and oleylamine (OLA) cannot efficiently maintain the optoelectronic properties and stability of iodide perovskite nanocrystals (NCs), post synthesis surface modification with some other ligand is a convenient and valid method to solve these problems to some extent. Here we promote a long carbon chain ligand with a thiol group, 1-Octadecanethiol (ODT), to realize the passivation of the surface of CsPbI3 NCs after the synthesis process. After modification, our ODT-CsPbI3 NCs exhibit excellent optical properties with a high PLQY of 93% and outstanding stability under different conditions compared to the untreated samples.