A new approach to manufacturing perovskite solar cells has addressed previous problems and yielded devices with high efficiency and
excellent stability, researchers at the National Renewable Energy Laboratory report in the new issue of the journalDeveloping highly stable and efficient perovskites based on a rich mixture of bromine and iodine is considered critical for the creation of tandem solar cells. The two elements, however, tend to separate when exposed to light and heat and thus limit the voltage and stability of a solar cell.
.” His co-authors from NREL are Qi Jiang, Jinhui Tong, Rebecca Scheidt, Amy Louks, Robert Tirawat, Axel Palmstrom, Matthew Hautzinger, Steven Harvey, Steve Johnston, Laura Schelhas, Bryon Larson, Emily Warren, Matthew Beard, and Joseph Berry.The new approach addressed that problem and produced a wide-bandgap solar cell with an efficiency of greater than 20% and 1.33-volt photovoltage and little change in the efficiency over 1,100 hours of continuous operation at a high temperature.
Perovskite refers to a crystalline structure formed by the deposition of chemicals onto a substrate. A high concentration of bromine causes more rapid crystallization of the perovskite film and often leads to defects that reduce the performance of a solar cell. Various strategies have been tried to mitigate those issues, but the stability of wide-bandgap perovskite solar cells is still considered inadequate.that flipped the typical perovskite cell.
The antisolvent approach allows the crystals to grow rapidly and uniformly within the perovskite film, crowding each other and leading to defects where the grain boundaries meet. The gas-quenching process, when applied to high-bromine-content perovskite chemicals, forces the crystals to grow together, tightly packed from top to bottom, so they become like a single grain and significantly reduces the number of defects.
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