Quantum dot solar cells are still a laboratory technology. As of 2026 there is no quantum dot panel on sale for your roof. The best certified quantum dot cell reaches 19.1% efficiency, set in 2023 on a cell of about 0.12 cm², while the best laboratory silicon cells are at roughly 27–28%.
The idea is not dead, but it has not arrived. Researchers are drawn to the unusual physics of these nanocrystals: their light absorption can be tuned, and in some conditions one photon can produce more than one electron. Stability, scale and toxicity, however, keep quantum dot solar firmly in the research lab rather than on rooftops. For how today’s mainstream panels work, see our guide to solar energy and what it means for the UK.
How quantum dot solar cells work
Quantum dots are semiconductor crystals just a few nanometres across. At that size, the light they absorb depends on their size, an effect called quantum confinement. By growing bigger or smaller dots, scientists can move the absorption edge to the wavelengths they want.
In a solar cell, the dots form the light-absorbing layer. They are usually made in solution as “colloidal” nanocrystals, so they can be printed or spin-coated like an ink, in principle onto flexible surfaces.
The usual materials are lead sulphide (PbS), lead selenide (PbSe) and, since about 2016, perovskite nanocrystals such as caesium/formamidinium lead iodide. Most high-efficiency quantum dot cells contain lead. Lead-free and cadmium-free dots, such as copper indium sulphide, are being researched, but at lower efficiency.
Scientists are interested for two main reasons:
- Tunable band gap. Because absorption depends on size, dots can be made to absorb infrared light that silicon misses. That makes them candidates for tandem cells, where a quantum dot layer is stacked with another absorber to use more of the spectrum.
- Multiple exciton generation (MEG). In a conventional cell, one photon produces at most one electron-hole pair. In quantum dots, a single high-energy photon can produce more than one. In December 2011, researchers at the US National Renewable Energy Laboratory (now the National Laboratory of the Rockies) reported in Science a lead selenide quantum dot cell with a peak external quantum efficiency of 114%. At certain wavelengths, it produced more electrons than photons arrived.
That 114% is not power conversion efficiency. It applied only to high-energy (blue and ultraviolet) photons, and the cell’s overall efficiency was far lower. A theoretical study by Hanna and Nozik in 2006 suggested that ideal MEG could raise the maximum possible efficiency by roughly a third compared with the conventional single-junction limit (the Shockley-Queisser limit, about 33–34%). That is a theoretical ceiling, not something any device has achieved.
Real-world examples and commercial status
Quantum dot solar has struggled to leave the lab. Efficiency is only part of the problem; stability and scale matter as much.
The efficiency records
The certified record for a quantum dot solar cell is 19.1%, set by the Ulsan National Institute of Science and Technology (UNIST) in South Korea on 23 March 2023. The cell measured just 0.12 cm², a square roughly 3.5 mm on each side, much smaller than a fingernail. No newer record appears in the laboratory’s efficiency table as of its August 2026 update.
Progress has been steady rather than dramatic: 2.9% in 2010, 7.0% (University of Toronto) in 2012, 8.55% (MIT) in 2013, 16.55% (University of Queensland) in 2018, 18.1% (UNIST) in 2020 and 19.1% in 2023. The last three records all used perovskite quantum dots rather than classic lead sulphide dots, so the fastest progress has come from borrowing perovskite chemistry. You may still see 2024 reports calling 18.1% a world record; that figure dates from 2020 and has been beaten.
Quantum dot windows
The nearest thing to a quantum dot solar product is in windows, not panels. A luminescent solar concentrator (LSC) puts quantum dots into a glass pane. The dots absorb some of the light and re-emit it towards small conventional solar cells at the edges of the window.
In 2021 the US firm UbiQD, based in Los Alamos, New Mexico, installed pilot quantum dot solar windows at three sites: a Holiday Inn Express and its own headquarters in Los Alamos, and NREL’s campus in Golden, Colorado. The pilots used copper indium sulphide dots licensed from MIT and Los Alamos National Laboratory. The window’s efficiency was reported at 3.6% in 2021. We could not find sales figures for these windows from 2023 onwards.
What you can actually buy
If you see “quantum dot” on a product in a shop today, it is almost certainly a display (a QLED television), not a solar panel.
What the numbers say
Certified record cell efficiencies, from the same laboratory data table (updated August 2026):
- Quantum dot cell: 19.1% (UNIST, 2023)
- Organic cell: 19.4% (2025)
- Silicon TOPCon cell: 26.68% (Trina Solar, December 2025)
- Perovskite cell: 28.0% (Hainan University, February 2026)
- Silicon heterojunction cell: 28.1% (LONGi, March 2026)
- Perovskite-on-silicon tandem cell: 35.2% (LONGi, February 2026)
All of these are small laboratory cells, not panels. Quantum dots are level with organic cells but well behind silicon and perovskites. Records are set on cells of around 0.1 cm², and turning a tiny lab cell into a full-size panel has not yet been shown for quantum dots.
Costs. There is no reliable cost per watt for quantum dot solar, because there is no commercial product to price. Printing quantum dot inks at low temperature could, in principle, be cheap, but that has never been proven at scale, and there is no commercial data to support claims that quantum dot cells are cheaper than silicon.
Limitations and honest assessment
Stability. The surfaces of quantum dots need chemical (ligand) treatments, and they degrade when exposed to oxygen and moisture. Long-term durability has not been demonstrated outdoors: we found no multi-year outdoor data for quantum dot panels.
Toxicity. The best-performing cells rely on lead, in lead sulphide, lead selenide or lead-halide perovskite dots. Lead-free alternatives exist in research but are less efficient. Any future product would need to deal with lead safely through its life and at disposal.
Scale. Records come from cells a fraction of a square centimetre in size. Nobody has yet shown a quantum dot module of commercial size, and no manufacturer sells one.
Weather. Older articles claimed quantum dot cells work especially well in cloudy weather. We found no evidence for this.
The UK angle
The UK’s involvement is in materials and research rather than panel manufacturing.
Nanoco Group, based in Runcorn and listed on the London Stock Exchange, makes cadmium-free quantum dots. Its solar work is historic: in 2010 it signed a joint development agreement with Tokyo Electron on a solar-active nanomaterial film. We found no Nanoco solar product on sale.
University of Oxford. Henry Snaith’s group, better known for perovskite solar cells, also publishes on perovskite quantum dots, including work on FAPbBr3 dots in 2025.
We found no UK quantum dot solar factory, product or government programme specific to the technology. Homes in the UK that install solar today get silicon panels; our guide to solar panels for your home in the UK covers costs and how they work.
Frequently asked questions
Are quantum dot solar cells available to buy?
No. As of 2026 there are no commercial quantum dot solar panels for homes or businesses. The technology is at the research and pilot stage, with only small trials of quantum dot windows.
How efficient are quantum dot solar cells?
The certified record is 19.1%, set by UNIST in South Korea in 2023 on a 0.12 cm² cell. The best laboratory silicon cells are at about 27–28%, and commercial panels are lower than lab cells for every technology.
Do quantum dot solar cells work better in cloudy weather?
We found no evidence that they work better in low light or overcast conditions than silicon cells.
Are quantum dot solar cells toxic?
Most high-efficiency quantum dot cells contain lead, in lead sulphide, lead selenide or lead-halide perovskite dots. Lead-free alternatives such as copper indium sulphide exist but are less efficient.
Can a quantum dot cell be more than 100% efficient?
No. In 2011 a lead selenide quantum dot cell showed a quantum efficiency of 114% at certain wavelengths, meaning it produced more electrons than incoming photons there. Its overall efficiency at turning sunlight into electricity was far lower.
Will quantum dot panels replace silicon soon?
Unlikely in the near term. Silicon manufacturing is mature, and quantum dots still face problems with stability, scale and lead. Perovskite solar cells are much closer to market.