标题/Title：

N-position effect of pyridine-functionalized cellulose on interfacial properties for efficient and stable perovskite solar cells

影响因子/Impact Factor：9.7

链接/Link：https://www.sciengine.com/SCC/doi/10.1007/s11426-025-2703-1

摘要/Abstract：

Developing multifunctional interfacial materials is critical in solving the poor interfacial contact and severe charge recombination in perovskite solar cells (PSCs). Here, based on low-cost green biomass cellulose, pyridine with varied N-positions is incorporated to produce esterified cellulose C-m-Py and C-p-Py as the electron-selective interface layer between tin oxide (SnO2) and perovskite. It was found that C-m-Py with the N atom at the meta-position shows a higher dipole moment and well-matched energy alignment compared to C-p-Py. Importantly, C-m-Py can simultaneously enhance the conductivity of SnO2 and passivation capacity toward perovskite, leading to improved interfacial charge extraction efficiency. Consequently, the C-m-Py-based PSCs deliver a remarkably high efficiency of 24.35%, along with excellent thermal stability. This study demonstrates a facile and cost-effective way to design efficient interfacial materials by the simple functionalization of renewable sources in nature.