Multifunctional Additives for Performance Improvements in WBG and NBG Perovskite Solar Cells

Why It Matters

Stability remains the primary barrier to large‑scale adoption of perovskite photovoltaics; additive‑driven improvements directly address this hurdle, accelerating market readiness for high‑efficiency tandem solar technologies.

Key Takeaways

• WBG PSCs suffer halide segregation, voltage loss
• NBG PSCs face Sn2+ oxidation, crystallization control
• Additive engineering tailored to composition improves stability
• Targeted additives suppress redox reactions in mixed perovskites
• Advances enable perovskite‑silicon tandem commercialization

Pulse Analysis

The rapid rise of organic‑inorganic metal halide perovskite solar cells has been driven by record‑breaking power conversion efficiencies that now rival crystalline silicon. Yet, the technology’s commercial promise is tempered by persistent stability concerns, especially under real‑world illumination and temperature cycles. Researchers have turned to additive engineering—a strategy of introducing small‑molecule or polymeric additives into the perovskite precursor—to fine‑tune film formation, passivate defects, and suppress detrimental chemical pathways. This approach offers a versatile toolbox that can be adapted to diverse perovskite chemistries.

Wide‑bandgap (WBG) perovskites, typically employed in the top cell of tandem stacks, suffer from halide segregation that creates local band‑gap fluctuations and erodes open‑circuit voltage over time. Multifunctional additives that coordinate with halide ions or form robust interfacial layers can immobilize the mixed‑anion lattice, reducing voltage loss and extending operational life. In narrow‑bandgap (NBG) formulations, especially those incorporating tin, Sn²⁺ readily oxidizes to Sn⁴⁺, triggering deep traps and rapid degradation. Additives that act as reducing agents or that modulate crystallization kinetics help preserve the Sn²⁺ state and produce uniform grains, directly translating into higher fill factors and longer stability windows.

The convergence of targeted additive chemistry with compositional engineering is now enabling perovskite‑silicon tandem modules that exceed 30% efficiency while maintaining multi‑year stability benchmarks. As manufacturers scale pilot lines, the cost‑effective nature of additive processing—often compatible with existing solution‑coating equipment—makes it attractive for large‑area production. Future research will likely focus on multifunctional molecules that simultaneously passivate defects, regulate ion migration, and enhance environmental resilience, positioning perovskite photovoltaics as a credible challenger to incumbent thin‑film technologies.