sciencebriefs
10:19in productionCh. 1 · The First Device/ 10:19 · ceiling 15 min
Energy · Materials

Perovskite solar cell

Kojima, Park and others

A cheap, simple perovskite layer replaced silicon’s monopoly — but only in the lab, and only so far.

Perovskite solar cells began with CsSnI3 in a solid-state dye-sensitized architecture. They proved 3D halide perovskites could act as efficient semiconductors — not just additives — and enabled rapid efficiency gains: 3.8% to 27% (single-junction) and 34.85% (silicon tandem) between 2009 and 2025. The materials are cheap and simple to make. But no source names Kojima or Park, reports stability, or confirms real-world deployment.

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Chapters & takeaways4
  1. 0:50
    The First Device

    CsSnI3 was the first perovskite used — as both absorber and hole transporter — in a solid-state dye-sensitized cell.

  2. 2:38
    What It Proved

    It proved 3D halide perovskites could operate as efficient active semiconductors in solid-state devices.

  3. 3:48
    The Speed of Progress

    Perovskite cells became the fastest-advancing solar tech by 2016, hitting 27% in labs by 2025 and 34.85% in silicon tandems.

  4. 5:25
    Why It Scales

    Perovskite materials like methylammonium lead halides and cesium lead halides are cheap to produce and simple to manufacture.

Worth your time?

Yes. Study the whole thing.

4/ 5
What works
  • efficiency gain
  • low-cost synthesis
  • solid-state semiconductor function
  • tandem-cell advantage
What does not
  • Kojima
  • Park
  • stability
  • commercialisation
Study it if
  • engineers
  • policy-makers
  • materials scientists
Skip it if
  • general public seeking consumer products
  • clinicians
  • historians of science without technical context
The written brief1 min read

What the work claims

That a three-dimensional halide perovskite could serve as an efficient active semiconductor in a solid-state solar cell — not just a sensitiser or additive.

How it was done

The first perovskite solar cell used CsSnI3 as both a p-type hole transport layer and absorber in a dye-sensitized configuration. It was a solid-state device, not liquid-based.

What holds up

The work established that a three-dimensional halide perovskite can function as an active semiconducting component in a solid-state device at high efficiency. Perovskite materials are cheap to produce and simple to manufacture.

What does not

The sources do not name Kojima or Park as authors of the first perovskite solar cell. They do not describe any mechanism, stability data, degradation pathways, commercial deployment, or scalability limits.

Why it matters beyond the lab

Perovskite solar cells now exceed the maximum efficiency of single-junction silicon cells in tandem architectures (34.85%), offering a low-cost, scalable route to higher photovoltaic performance.

Is it worth your time

Yes — it launched the fastest-advancing solar technology as of 2016, with lab efficiencies jumping from 3.8% in 2009 to 27% in single-junction cells by 2025.

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