Image: School of Engineering on the Hong Kong University of Science and Technology
Scientists from HKUST’s School of Engineering have revealed the existence and impact of floor concavities on particular person crystal grains in perovskite skinny movies.
They admit to “Elimination of Grain Surface Concavities for Enhanced Perovskite Thin-Film Interfaces” – lately revealed on Natural Energy – that concavities in perovskite supplies are “triggered by grain-coalescence-induced biaxial tensile pressure and thermal-coarsening-induced grain-boundary grooving.”
The scientists stated that the concavities break the structural continuity of the perovskite movie interface and restrict the effectivity and stability of the perovskite cells. An announcement from HKUST defined that whereas perovskite photo voltaic cells have the potential to switch present silicon cells in lots of functions, their long-term stability underneath mild, humidity, and thermomechanical circumstances stays an impediment. of commercialization.
To totally examine the impact of concavities on the grain floor, the staff eliminated them by utilizing a surfactant molecule, tridecafluorohexane-1-sulfonic acid potassium, to govern pressure evolution and ion diffusion through the formation of perovskite movies.
In the analysis paper, the researchers doc how their ensuing perovskite photo voltaic cells present enhanced energy conversion effectivity and excessive energy conversion effectivity retention underneath ISOS-standardized thermal biking (300 cycles), damp warmth (660 hours) and most energy level monitoring (1,290 hours). ) checks.
“The construction and geometry of the person crystal grains is the supply of the manufacturing of perovskite semiconductors and photo voltaic cells,” stated Prof. Zhou Yuanyuan, the corresponding writer of the analysis paper. “By opening up the concavities on the grain floor, understanding their results, and utilizing chemical engineering to tailor their geometry, we pioneered a brand new option to make perovskite photo voltaic cells with excessive effectivity and power of their limits.”
Zhou stated the staff was “intrigued by the floor concavities of the perovskite grains” noticed via atomic pressure microscopy, as a result of the concavities are normally hidden beneath the floor of the movie and are sometimes ignored.
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