A Metal‐Free Phthalocyanine Additive for Defect Passivation and Processing Tolerance in High‐Efficiency Perovskite Solar Cells

Why It Matters

The breakthrough shows that solubility‑engineered, metal‑free additives can lift wide‑bandgap perovskite efficiencies while simplifying manufacturing tolerances, accelerating commercial viability. It also enables color‑customizable solar modules, expanding market applications beyond conventional power generation.

Key Takeaways

• Metal-free phthalocyanine additive improves perovskite solubility
• Enables 20.41% efficiency for wide-bandgap cells
• Tolerates 1.75 mM loading without performance loss
• Provides tunable color for aesthetic solar modules

Pulse Analysis

Perovskite solar cells have surged ahead of traditional photovoltaics thanks to their high absorption coefficients and low‑temperature processing, yet scaling them remains hampered by defect‑induced recombination and stringent formulation windows. Additives that can both dissolve readily in the precursor solution and interact with the perovskite lattice are scarce, especially metal‑free options that avoid potential contamination and stability concerns. The emergence of metal‑free phthalocyanines, historically limited by poor solubility, therefore represents a pivotal shift in material engineering for next‑generation solar devices.

CG‑0 exemplifies a rational design strategy: peripheral chlorine atoms boost chemical robustness while ethoxy side chains dramatically increase solubility, enabling concentrations as high as 1.75 mM without compromising film quality. This high loading not only passivates grain‑boundary traps through multi‑point interactions but also steers crystal growth toward uniform, low‑defect grains. The result is a record‑setting 20.41% power conversion efficiency for wide‑bandgap cells under AM 1.5G and an impressive 38.60% under 1000 lux indoor lighting, both paired with fill factors exceeding 82%, underscoring the additive’s dual benefit for outdoor and indoor energy harvesting.

Beyond performance, CG‑0 introduces a new aesthetic dimension to photovoltaics. Its near‑infrared absorption and tunable coloration allow manufacturers to produce solar modules that blend seamlessly with architectural designs or consumer products, a feature rarely achievable with conventional perovskite formulations. This color adaptability, combined with processing tolerance, lowers manufacturing barriers and opens avenues for integrated, decorative, or wearable solar technologies, positioning metal‑free phthalocyanine additives as a catalyst for broader market adoption.