Perovskite Lattice Compliance: Stability in Bifacial Tandem PVs

Nature Energy

Overview

Researchers have identified perovskite lattice compliance as a key materials descriptor for improving the photothermal stability of bifacial perovskite/silicon tandem solar cells. By suppressing microstrain accumulation, these cells achieved a power-generation density of 36.2 mW cm−2 and retained 90% efficiency after 1,000 hours of testing.

In Depth

Key Findings

Bifacial monolithic perovskite/silicon tandem solar cells have demonstrated a power-generation density of 36.2 mW cm−2 under 0.20 albedo-equivalent illumination. These devices exhibit high stability, retaining 90% of their initial efficiency after more than 1,000 hours of ISOS-L-2 testing, conducted at 65 °C under 1-sun illumination.

Technical Details

The study identifies “perovskite lattice compliance”—the ability of the crystal lattice to elastically accommodate stress—as the governing factor for photothermal stability. The researchers utilized perovskite absorbers with a bandgap of approximately 1.55 eV. This specific composition reduces the reliance on bromide, which largely mitigates light-induced halide segregation.

Higher lattice compliance enhances stability through several mechanisms:

• Suppression of thermally induced microstrain accumulation.
• Shifting of deep-level defects toward shallower states.
• Reduction of band-edge energetic disorder.

Background & Context

Bifacial tandem configurations are pursued to increase area-normalized power output. While reducing bromide content addresses halide segregation, it shifts the primary stability challenge to the intrinsic photothermal resilience of bromide-lean absorbers. This research establishes a physically testable framework to address these resilience issues at the absorber level.

Significance & Outlook

The establishment of lattice compliance as a materials descriptor provides a design principle for creating more stable perovskite absorbers. By focusing on the elastic properties of the crystal lattice to mitigate thermal stress, this approach offers a pathway toward more durable and efficient bifacial perovskite/silicon tandem photovoltaics.

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