A analysis group on the Faculty of Engineering of the Hong Kong College of Science and Know-how (HKUST) have revealed the existence of floor concavities on particular person crystal grains of perovskite skinny movies whereas unraveling their results on the movie’s properties and reliability.
To deal with points surrounding the long-term stability of perovskite gadgets underneath mild, humidity and thermomechanical circumstances, the group performed analysis centered on the supplies’ microstructure. They found a proliferation of floor concavities on the crystalline grains of the perovskite materials, proven to interrupt the structural continuity on the perovskite movie interface.
The group concluded that the damaged structural continuity serves as a hidden microstructure issue limiting the effectivity and stability of perovskite cells. Primarily based on this discovery, the group says it has pioneered a manner of creating these cells extra environment friendly and steady through a chemo-elimination of those grain floor concavities.
“Construction and geometry of particular person crystalline grains are the origin of the efficiency of perovskite semiconductors and photo voltaic cells,: says HKUST’s Prof. Zhou Yuanyuan, the corresponding creator of the work.
“By unveiling the grain floor concavities, understanding their results and leveraging chemical engineering to tailor their geometry, we’re pioneering a brand new manner of creating perovskite photo voltaic cells with effectivity and stability towards their limits.”
The group’s analysis work, a collaboration with Hong Kong Baptist College and Yale College, is entitled “Elimination of Grain Floor Concavities for Improved Perovskite Skinny-Movie Interfaces. It was printed within the journal Nature Vitality.
