Browsing by Author "Niu, Qiaoli"

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    Simultaneous trifunctional group passivation using imidazole derivatives for enhanced performance of perovskite solar cells
    (Elsevier Ltd, 2025) Iwuoha, Emmanuel; Yang, Jun; Niu, Qiaoli
    Perovskite solar cells (PSCs) are one of the most promising energy technologies in the field of renewable energy. The solution-based perovskite film-forming method is one of its important advantages in commercialization. However, the polycrystalline perovskite thin films prepared by this method may also exhibit various defects, leading to a decrease in device performance. In this work, an imidazole derivative 1-(2-hydroxyethyl)-3-methylimidazolium chloride (HMCl) was used as a passivator for perovskite thin films. The imidazole moiety and hydroxyl in HMCl passivated the negatively charged I - and positively Pb2+ defects in CH3NH3PbI3 (MAPbI3), respectively. Meanwhile the chloride ion establishes ionic bonds with uncoordinated Pb2+, further enhancing the passivation of defects. With HMCl, the PCE of the PSC was enhanced from 17.53 % of the control device to 19.71 %. In addition, the introduction of HMCl enhanced the hydrophobicity of perovskite films, and therefore, improved the storage stability of PSCs. This study provides an alternative passivator for the development of highperformance and long-term stable PSCs.