Bismuth oxyiodide light absorbers. Credit: Steve Penney, University of Cambridge
Researchers have demonstrated how a non-toxic alternative to lead could form the basis of next-generation solar cells. The team from the University of Cambridge and the United States, have used theoretical and experimental methods to show how bismuth – the “green element” which sits next to lead on the periodic table, could be used in low-cost solar cells. Their results suggest that solar cells incorporating bismuth can replicate the properties that enable the exceptional properties of lead-based solar cells, but without the same toxicity concerns. Later tests by another research group showed that bismuth-based cells can convert light into energy at efficiencies up to 22%, which is comparable to the most advanced solar cells currently on the market.
Most of the solar cells which we see covering fields and rooftops are made from silicon. Although silicon is highly efficient at converting light into energy, it has a very low “defect tolerance,” meaning that the silicon needs to have very high levels of purity, making it energy-intensive to produce. Over the past several years, researchers have been looking for materials which can perform at similar or better levels to silicon, but that don’t need such high purity levels, making them cheaper to produce. The most promising group of these new materials are called hybrid Pb halide perovskites, which appear to promise a revolution in solar energy.
As well as being cheap and easy to produce, perovskite solar cells have become almost as energy-efficient as silicon. However, despite their enormous potential, perovskite solar cells are also somewhat controversial since lead is integral to their chemical structure. Whether the lead contained within perovskite solar cells represents a tangible risk to humans, animals and the environment is being debated, however, some scientists are now searching for non-toxic materials which could replace the lead in perovskite solar cells without negatively affecting performance.
“We wanted to find out why defects don’t appear to affect the performance of lead-halide perovskite solar cells as much as they would in other materials,” said Dr Robert Hoye of Cambridge’s Cavendish Laboratory and Department of Materials Science & Metallurgy. “If we can figure out what’s special about them, then perhaps we can replicate their properties using non-toxic materials.”
Hoye and his colleagues looked at bismuth oxyiodide, previously investigated for use in solar cells and water splitting, but was not thought to be suitable because of low efficiencies and because it degraded in liquid electrolytes. The researchers used theoretical and experimental methods to revisit this material for possible use in solid-state solar cells. They found that bismuth oxyiodide is as tolerant to defects as lead halide perovskites. Bismuth oxyiodide is also stable in air for at least 197 days, which is a significant improvement over some lead halide perovskite compounds. By sandwiching the bismuth oxyiodide light absorber between two oxide electrodes, they were able to demonstrate a record performance, with the device converting 80% of light to electrical charge. The bismuth-based devices can be made using common industrial techniques, suggesting that they can be produced at scale and at low cost.
“Bismuth oxyiodide has all the right physical property attributes for new, highly efficient light absorbers,” said Professor Judith Driscoll, of the Department of Materials Science and Metallurgy. “I first thought of this compound around 5 years ago, but it took the highly specialised experimental and theoretical skills of a large team for us to prove that this material has real practical potential.”
“Previously, the global solar cell research community has been searching for non-toxic materials that replicate the defect tolerance of the perovskites, but without much success in terms of photovoltaic performance,” said Dr David Scanlon, a theorist at UCL not involved in this work. “When I saw this work, my team calculated based on the optical properties that bismuth oxyiodide has a theoretical limit of 22% efficiency, which is comparable to silicon and the best perovskite solar cells. There’s a lot more we could get from this material by building off this team’s work.” http://www.cam.ac.uk/research/news/non-toxic-alternative-for-next-generation-solar-cells
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