Dust soiling of solar surfaces and the texture/groove penalty

Source: Scientific Reports (Nature), 2024 (s41598-024-72772-7). Credibility: High (peer-reviewed). Confidence: high.

Key points

• Soiling is severe: ~50% power loss (14 W vs 24.75 W treated), ~65% short-circuit-current deficit; literature expects >50% output loss over three months without cleaning.
• Dust loading reached 12 g/m², irregular ~800 nm particles with negative zeta potential → strong adhesion (lodges and bridges in grooves).
• Mitigation is surface-energy driven (superhydrophilic coatings enabling rain self-cleaning) — works best on smooth surfaces; grooves resist rinsing.

Relevance

The decisive practical caveat for geometric-blackness-solar-adsorption-bed-face: grooves trap dust that a flat face sheds, and soiling can erase tens of percent of capture — likely swamping the small (+0.05-0.10) optical gain outdoors. Plus grooves self-shade at low sun angles and add thermal mass.