Scientists Achieve 27% Efficiency in a Co-Deposited Inverted Perovskite

Why It Matters

The breakthrough pushes inverted perovskite devices toward commercial viability by delivering record efficiency and unprecedented thermal stability, addressing two of the main barriers to market adoption. It also offers a scalable co‑deposition route compatible with industrial coating techniques.

Key Takeaways

• Asymmetric SAM PhBr-4PACz suppresses aggregation, improves interface coverage
• AVIMCl crosslinks grain boundaries, halting SAM diffusion and enhancing stability
• Certified 27.03% efficiency sets record for co‑deposited inverted perovskites
• Devices retain >90% performance after 2,000 h at 85 °C
• Approach works on ITO, flexible PET/ITO, and 8.9 cm² mini‑module

Pulse Analysis

Inverted perovskite photovoltaics have attracted attention for their simple stack and reduced hysteresis, yet co‑deposited architectures suffer from self‑assembled molecule (SAM) aggregation that compromises interfacial uniformity. Traditional post‑deposition SAM treatments add processing steps and can introduce defects, limiting throughput. By mixing an asymmetric SAM, PhBr‑4PACz, directly into the perovskite precursor, the researchers achieved vertical redistribution of the molecule, concentrating it at the buried interface where it enhances charge extraction while avoiding excess on the top surface.

The second pillar of the approach is the ionic‑liquid additive 1‑allyl‑3‑vinylimidazolium chloride (AVIMCl), which penetrates grain boundaries and crosslinks at 100 °C. This in‑situ crosslinking locks the SAM in place, suppresses upward diffusion during thermal stress, and reduces residual strain. The combined effect delivered a certified 27.03% power‑conversion efficiency—setting a new benchmark for co‑deposited inverted cells—and demonstrated remarkable durability, retaining over 90% of its performance after 2,000 hours at 85 °C. Such stability rivals that of mature silicon modules, a critical milestone for perovskite market entry.

Beyond laboratory metrics, the study showcases scalability. The same chemistry was transferred to indium‑tin‑oxide substrates, flexible PET/ITO, and an 8.9 cm² mini‑module, indicating compatibility with roll‑to‑roll processes like slot‑die and blade coating. As manufacturers seek low‑cost, high‑efficiency alternatives to silicon, this dual‑strategy platform could accelerate the transition from pilot lines to commercial production, especially if further optimization lifts open‑circuit voltage and reduces recombination losses. The work positions inverted perovskites as a credible contender in the next generation of solar technology.