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New family of light-converting materials points to cheaper, more efficient solar power and LEDs
http://news.engineering.utoronto.ca/crystal-light/January 29, 2015 | Marit Mitchell
[font face=Serif][font size=5]Crystal light: New family of light-converting materials points to cheaper, more efficient solar power and LEDs[/font]
[font size=3]Engineers are shining new light on an emerging family of solar-absorbing materials that could clear the way for cheaper and more efficient solar panels and LEDs.
The materials, called perovskites, are particularly good at absorbing visible light, but had never been studied in their purest form: as perfect single crystals.
Using a new technique, researchers grew large, pure perovskite crystals and studied how electrons move through the material as light is converted to electricity.
Led by Professor Ted Sargent of The Edward S. Rogers Sr. Department of Electrical & Computer Engineering at the University of Toronto in collaboration with Professor Osman Bakr of the King Abdullah University of Science and Technology (KAUST), the team used a combination of laser-based techniques to measure selected properties of the perovskite crystals. By tracking down the ultrafast motion of electrons in the material, they have been able to measure the diffusion length—how far electrons can travel without getting trapped by imperfections in the material—as well as mobility—how fast the electrons can move through the material. Their work was published this week in the journal Science.
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http://dx.doi.org/10.1126/science.aaa2725[font face=Serif][font size=5]Crystal light: New family of light-converting materials points to cheaper, more efficient solar power and LEDs[/font]
[font size=3]Engineers are shining new light on an emerging family of solar-absorbing materials that could clear the way for cheaper and more efficient solar panels and LEDs.
The materials, called perovskites, are particularly good at absorbing visible light, but had never been studied in their purest form: as perfect single crystals.
Using a new technique, researchers grew large, pure perovskite crystals and studied how electrons move through the material as light is converted to electricity.
Led by Professor Ted Sargent of The Edward S. Rogers Sr. Department of Electrical & Computer Engineering at the University of Toronto in collaboration with Professor Osman Bakr of the King Abdullah University of Science and Technology (KAUST), the team used a combination of laser-based techniques to measure selected properties of the perovskite crystals. By tracking down the ultrafast motion of electrons in the material, they have been able to measure the diffusion length—how far electrons can travel without getting trapped by imperfections in the material—as well as mobility—how fast the electrons can move through the material. Their work was published this week in the journal Science.
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