Interfacial defect passivation by multiple-effect molecule for efficient and stable perovskite solar cells

Perovskite solar cells (PSCs) are widely studied as the most promising photovoltaic device, which have attracted vast interest in recent years due to their excellent power conversion efficiency (PCE) and low cost. Although the PSC have reached a PCE over 25%, the interface between the perovskite and hole transport layer (HTL) still is a crucial factor limiting higher PCE and long-term stability. In this work, we choose an organic molecule Bis(trifluoromethyl)benzo amide (6FBZm) to passivate defects at the perovskite/HTL interface. Owing to a strong interaction with uncoordinated Pb2+, the 6FBZm effectively passivated the surface defects, remarkably promoted carrier transportation. As a result, the perovskite device based on 6FBZm surface modification showed a PCE increase of 16.4% over the control device. Especially, the fill factor (FF) and the open-circuit voltage (VOC) of the modified device increased significantly. In addition, the unencapsulated 6FBZm-modified device maintains better PCE compared to the control device after aging for over 600 h in ambient air with extreme humidity and temperature conditions. Results suggested that the introduction of 6FBZm is a promising strategy to modify the surface of perovskite film aiming at highly efficient and stable perovskite solar cells.

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