A research team led by Professors Pengwei Li, Yanlin Song, and Yiqiang Zhang has advanced quasi-2D alternating-cation-interlayer (ACI) perovskite solar cells by introducing a dicyandiamide (DCD)-based molecular bridge strategy. Their work, published in Nano-Micro Letters , demonstrates a dual-functional interface engineering approach that simultaneously passivates defects and regulates phase distribution, enabling record efficiencies and enhanced stability for 2D perovskite photovoltaics.
Why This Strategy Matters
Design Strategy
The innovation lies in leveraging the multifunctional guanidine and cyano groups of DCD:
Mechanistic Insights
Spectroscopic and theoretical analyses confirm that:
Performance Highlights
Future Outlook
This study establishes a molecular bridge strategy that integrates defect passivation and phase homogenization, effectively decoupling the long-standing efficiency–stability trade-off in quasi-2D perovskites. Beyond solar cells, this versatile approach provides a universal platform for interface engineering in perovskite-based optoelectronics, including light-emitting diodes and photodetectors.
By uniting materials chemistry, interfacial physics, and device optimization , Professors Li, Song, and Zhang deliver a clear blueprint for the scalable development of efficient and durable next-generation perovskite photovoltaics.
Nano-Micro Letters
Experimental study
Dicyandiamide-Driven Tailoring of the n-Value Distribution and Interface Dynamics for High-Performance ACI 2D Perovskite Solar Cells
23-Jun-2025