The inhomogeneity of crystallization along the vertical direction of perovskite films results in voids and traps at the buried interface, thus affecting the efficiency and stability of perovskite solar cells . Liu Shengzhong and Lu Zhang of Shaanxi Normal University and Jiaxue You of City University of Hong Kong used the heavy gravity and high surface charge density of bovine serum albumin-functionalized gold nanoclusters (ABSA) to combine with the strong interaction of the electron transport layer to achieve In reconstructing the buried interface, not only high-quality crystallization can be obtained, but also carrier transfer can be improved.
ABSA macromolecules with amine functional groups and large surface charge density interact with perovskite to increase the crystallinity and gradually migrate to the buried interface, repairing defective gaps, thus increasing the surface recombination speed from 3075 cm·s−1 Suppressed to 452 cm·s−1.
The repaired buried interface and the higher surface potential of ABSA-modified TiO2 can improve carrier extraction at the interface. The resulting solar cells had a power conversion efficiency of 25.0% with negligible hysteresis and retained 92.9% of their initial efficiency after 3200 hours of exposure to ambient atmosphere. They also showed better performance compared to control devices. Continuous irradiation stability.
The findings provide a new metal-protein complex that can eliminate harmful voids and defects at buried interfaces, thereby improving photovoltaic performance and stability.
Li, K., Zhang, L., Ma, Y., Gao, Y., Feng, X., Li, Q., Shang, L., Yuan, N., Ding, J., Jen, A. K., You, J., Liu, S. F., Au Nanocluster Assisted Microstructural Reconstruction for Buried Interface Healing for Enhanced Perovskite Solar Cell Performance. Adv. Mater. 2023, 2310651.
https://doi.org/10.1002/adma.202310651
https://onlinelibrary.wiley.com/doi/10.1002/adma.202310651