![]() “The kinetic activity found in halide perovskites poses significant challenges for advancing high-efficiency optoelectronic materials and devices,” said Kai Xiao, study co-author and ORNL staff scientist. ![]() Halogen ions, jockeying for a position in the growing structure, affect the movement of charges through the crystals and subsequently impact the efficiency of sunlight’s conversion to electricity. Using high-powered imaging techniques, Yang and the team tracked kinetic activity in organometallic halide perovskites. “The simple printing or spraying of perovskite ink makes solar module costs even lower.” “To take that first step and maximize solar cell technology made with organometallic halide perovskites, we need to know how to grow high quality light-absorbing material and establish optimal film growth processes,” said Yang, the study’s lead author. These materials are easy and cheap to grow but have been known to degrade,” said Bin Yang, an ORNL postdoctoral researcher at the Center for Nanophase Materials Science.Ī new study published in the Journal of the American Chemical Society demonstrates that in the presence of reactive iodide ions, negatively charged bromine and chlorine are left out of the final perovskite crystal structure – like not making the team in gym class. “Organometallic halide perovskite semiconductors have high carrying capacity and efficiency to rival silicon-based solar cells. Perovskite-based solar cells, however, have been hindered by unreliable durability, poor efficiency and unresolved questions. One promising area of solar energy research involves perovskites, a material that can potentially convert sunlight into electricity more efficiently and less expensively than typical silicon-based semiconductors. Photovoltaic cells that convert sunlight directly into electricity are becoming increasingly prominent in the world's renewable energy mix. OAK RIDGE, Tenn., Ap– Researchers at the Department of Energy’s Oak Ridge National Laboratory have found a potential path to further improve solar cell efficiency by understanding the competition among halogen atoms during the synthesis of sunlight-absorbing crystals.
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