Modern Solar & Perovskite Tandems

The plummeting cost of sunlight.

Driven by "Swanson's Law" (the observation that solar prices drop 20% every time cumulative global volume doubles), solar energy has transitioned from an expensive space technology to the cheapest source of electricity on Earth. By 2026, the commercial rollout of Perovskite-Silicon "tandem" cells shattered the theoretical efficiency limits of standard silicon.

Key Numbers

Efficiency Limit Broken

34.85% (Tandem Cell)

Cost Collapse (Swanson's Law)

-99.6% since 1970

Verified Facts

• The original 1954 Bell Labs cell had an efficiency of 6%. By 2024, commercial silicon panels peaked around 23-24% due to physical limits. By 2026, new Perovskite-Silicon tandem lab cells smashed past 34.8% efficiency, moving rapidly into mass production.
• Since the 1970s, the cost of solar modules plummeted by over 99%, dropping from $76 per watt to under $0.30 per watt today. With tandem cells, the "balance-of-system" costs continue to plummet due to massive power density.
• This exponential drop in price (perfectly mirroring Moore's Law in computing) is considered a major prerequisite for the Singularity, providing the nearly-free, limitless energy required to power global artificial intelligence infrastructure.

Frequently Asked Questions

Sources & Further Reading

• Wikipedia: Swanson's law

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