In the field of perovskite solar cells, improving efficiency and stability is a key research direction. Recently, GCL Technology, the Chinese Academy of Sciences and Ningbo University jointly released a study that significantly improved the performance of perovskite solar cells by using non-fullerene acceptors (NFAs) as interfacial modifiers. The researchers used Y6-BO and Y7-BO NFAs to modify the perovskite/electron transport layer (ETL) interface. These NFAs dissolve in non-polar solvents and effectively pass through surface defects without causing structural damage to the perovskite layer. . In addition, electron transfer is significantly accelerated through NFAs modification, improving the power conversion efficiency (PCE) of perovskite solar cells. 

Figures (a-c) J-V characteristics of i-PSMs with areas of 50, 400, and 1160 cm2, respectively. Inset: Photographs of PCEs. (d) Summary of PCEs reported for i-PSMs with different areas.

The results show that the PCE of perovskite solar cells (i-PSCs) treated with Y6-BO and Y7-BO reaches 25.82%. In particular, perovskite solar modules (i-PSMs) using nonpolar solvents and Y7-BO molecules achieve record efficiencies of 23.05%, 22.32%, and 21.1% at active areas of 50 cm², 400 cm², and 1160 cm², respectively. In addition, the Y7-BO treated perovskite solar cells retain 94% of their initial efficiency after 1522 hours of maximum power point aging.

Table. Photovoltaic parameters of control, PVK/Y6-BO and PVK/Y7-BO perovskite solar cells, and PVK/Y7-BO perovskite solar modules. 

These findings suggest that modification of NFAs offers promise for the commercialization of perovskite solar cells. By optimizing the perovskite/ETL interface, the efficiency and stability of perovskite solar cells can be significantly improved, paving the way for the large-scale production and application of perovskite solar cells.