Dicyandiamide-Driven Tailoring of the n-Value Distribution and Interface Dynamics for High-Performance ACI 2D Perovskite Solar Cells.

ABSTRACT: Organic-inorganic hybrid perovskite solar cells achieve remarkable efficiencies (> 26%) yet face stability challenges. Quasi-2D alternating-cation-interlayer perovskites offer enhanced stability through hydrophobic spacer cations but suffer from vertical phase segregation and buried interface defects. Herein, we introduce dicyanodiamide (DCD) to simultaneously address these dual limitations in GA(MA)_nPb_nI_3n+1 perovskites. The guanidine group in DCD passivates undercoordinated Pb²⁺ and MA⁺ vacancies at the perovskite/TiO₂ interface, while cyano groups eliminate oxygen vacancies in TiO₂ via Ti⁴⁺-CN coordination, reducing interfacial trap density by 73% with respect to the control sample. In addition, DCD

SUBMITTER: Chen G 

PROVIDER: S-EPMC12185858 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature