Through surface engineering research, functional agents can effectively improve the device performance of perovskite solar cells (PSCs ). However, the influence of intrinsic properties of molecules on the final performance of devices has been overlooked. Liu Shengzhong and Feng Jiangshan of Shaanxi Normal University and Fang Zhimin of Yangzhou University developed a surface reconstruction strategy to improve the efficiency of inverted PSCs by mitigating the adverse effects of lead chelating (LC) molecules.
BCP was chosen as a representative LC molecule due to its easy access and outstanding optoelectronic properties. In this strategy, the BCP molecules on the perovskite surface are first dissolved in the solvent and then captured by low-coordinated Pb2+ ions, thus preventing undesirable n-type doping of the molecules themselves.
In this case, BCP molecules exhibit significant passivation on the perovskite surface, resulting in a significant increase in the open circuit voltage (V OC ). As a result, a record PCE of 25.64% was achieved, maintaining over 80% of the initial efficiency after approximately 1500 hours of exposure to ambient conditions.
N. Yan, Y. Cao, Z. Jin, Y. Liu, SF Liu, Z. Fang, J. Feng, Surface Reconstruction for Efficient NiOx -based Inverted Perovskite Solar Cells. Adv. Mater. 2024, 2403682.
https://doi.org/10.1002/adma.202403682