In a recent study by researchers from Henan University and the Chinese Academy of Sciences (CAS), the interface of indium tin oxide/electron transport layer (ITO/ETL) in n-i-p structured devices was targeted. Electron transport layers are typically fabricated using commercial nano tin dioxide, which often displays insufficient density. To combat this, the scientists employed the commonly used bathocuproine (BCP) material to treat the ITO/ETL interface.
The incorporation of BCP diminishes the direct contact between the perovskite and ITO layers, while also passivating buried interface and adjusting the crystal orientation of perovskites. Furthermore, the substrate layer exhibits improved transparency, consequently elevating the utilization rate of light by perovskite.
As a result, the BCP-based PSC exhibited an impressive efficiency greater than 22%, surpassing the control one of 19.91%, and simultaneously demonstrated excellent stability.
The novel approach of utilizing the well-established material bathocuproine (BCP) to optimize the performance of n-i-p perovskite solar cells (PSCs) could have universal applicability in the improvement of PSCs performance.