Zinc doping improves light stability in perovskite single crystals
The study compared local lattice strain with the evolution of photoluminescence over 60 days.
Ruxue Li and colleagues studied illuminated MAPbBr₃ single crystals doped with zinc. The smaller dopant ion introduced local strain; cryogenic transmission electron microscopy and optical spectroscopy helped the authors examine how light-induced deformation could compensate for it.
The measured photoluminescence intensity of the zinc-doped sample fell by less than 3% over 60 days. The team also used photodetector measurements to assess defect states. Liyuan Zhang contributed as a coauthor affiliated with SUSTech’s physics department.