Meticulous Design of High-Polarity Interface Material for FACsPbI Perovskite Solar Cells with Efficiency of 26.47.

Designing new interface materials with the multifunctions of upper film crystallization control, interfacial defects passivation, and interfacial energy level regulation is crucial for developing efficient and stable perovskite solar cells (PSCs). Herein, a high polarity interfacial material, 2-cyano-N,N,N-trimethylammonium bromide (CNCB), was synthesized to engineer the buried interface between SnO and perovskite of the PSCs. Comprehensive theoretical and experimental investigations demonstrate that CNCB interacts with perovskite precursors (PbI and FAI) to regulate crystallization kinetics, yielding perovskite films with preferred orientation and reduced defects.

Shape-Memory and Anisotropic Carbon Aerogel from Biomass and Graphene Oxide.

Biomass, as the most abundant and sustainable resource on the earth, has been regarded as an ideal carbon source to prepare various carbon materials. However, manufacturing shape-memory carbon aerogels with excellent compressibility and elasticity from biomass remains an open challenge. Herein, a cellulose-derived carbon aerogel with an anisotropic architecture is fabricated with the assistance of graphene oxide (GO) through a directional freeze-drying process and carbonization.