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Photo: Researchers use potassium to "cure" perovskite solar cells. Photo: Courtesy of Cambridge University.
An international team of scientists at Cambridge University found that the addition of potassium iodide “cure†defects and immobilize ion motion, factors that have become limiting the efficiency of inexpensive perovskite solar cells.
The next generation of solar cells can be used as an energy efficiency enhancing layer on top of existing silicon-based solar cells.
The solar cells under study are based on metal halide perovskites, which are inexpensive and easy to produce at low temperatures. These characteristics make perovskites attractive for the next generation of solar cells and lighting.
However, even with these advantages, there are some limitations that prevent their efficiency and consistency. The tiny defects in the crystal structure of the perovskite, known as traps, can cause electrons to "snap" before releasing energy.
Dr. Sam Stranks, who is in charge of research at the Cavendish Laboratory in Cambridge, said: “So far we have not been able to keep these materials stable with the band gap we need, so we have been trying to fix the ion movement by adjusting the chemical composition. Perovskite layer."
"This will enable perovskites to be used to make multifunctional solar cells or colored LEDs, which are essentially the reverse operation of solar cells."
In this study, scientists changed the chemical composition of the perovskite layer by adding potassium iodide to the perovskite ink.
Potassium iodide forms a film on top of the perovskite, which has the function of "healing" traps, allowing electrons to move more freely and immobilizing ions to move.
Stranks said: "Potassium can stabilize the perovskite band gaps of the solar cells we want to connect in series and make them easier to emit, which means that more efficient solar cells can be made."
"It almost completely controls the ions and defects in the perovskite."
(Original from: Cleantech Business Review)
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