Dry transfer of hBN & aBN thin film on perovskite/glass substrate
The conventional wet transfer method involves immersion in a water, which cause severe damage to perovskite nanocrystals.
The new dry transfer method was used to transfer hBN(or aBN) film onto perovskite nanocrystal without immersion in water.
It was confirmed that the fluorescence characteristics of perovskite nanocrytsals were well-maintained after dry transfer of the hBN(or aBN) encapsulating layer.
Figure. 1 (a) Dry transfer method of hBN(or aBN) thin film on Perovskite/Glass substrate. (b) Scheme of hBN/Perovskite encapsulation and photograph of hBN/Perovskite/Glass.
Fluorescence stability test of hBN & aBN encapsulated perovskite
It was conformed that perovskite nanocrystals encapsulated with hBN or aBN exhibited less reduction in fluorescence intensity after 6 days of exposure to air compared to those exposed without encapsulation.
Figure. 2 Photoluminescence spectra of (a) hBN/CsPbBr3/hBN/Glass, (b) 1 nm aBN/CsPbBr3/aBN/Glass, (c) 6 nm aBN/CsPbBr3/aBN/Glass, (d) CsPbBr3/Glass, (e) CsPbBr3/hBN/Glass, and (f) CsPbBr3/aBN/Glass.
Characterization
Photoluminescence (PL) spectra were measured by Carey Eclipse fluorometer (Varian, USA).