In Situ Low-Temperature Growth and Superior Luminescent
Property of Well-Aligned, High-Quality Cubic CsPbBr3 Micrometer-Scale
Single Crystal Arrays on Transparent Conductive Substrates
posted on 2022-01-26, 16:03authored bySijia Li, Yongzhi She, Huaiyi Ding, Jinlong Yang, Jing Peng, Min Wu, Xiangdong Kong, Dengbao Han, Nan Pan, Xiaoping Wang
Direct
assembly of high-quality single-crystal perovskite microarrays
on transparent conductive substrates and carrier injection layers
is vital to realize high-performance optoelectronic devices. Although
cubic-phase CsPbBr3 is considered to have a higher structural
and optical quality than the orthorhombic one, obtaining a well-aligned
assembly directly on the aforementioned substrates is still challenging.
Here we developed a solvent-assisted crystallization strategy with
the assistance of surface modifiers, through which the in situ low-temperature
growth of well-aligned cubic single-crystal CsPbBr3 microarray
with a preferential out-of-plane [100] orientation is achieved for
the first time on commercial transparent conductive substrates. As
compared with the control orthorhombic samples, the cubic CsPbBr3 single crystals possess superior properties including a higher
photoluminescence internal quantum efficiency, fewer defect states,
a weaker scattering by phonons, and an appearance of lasing. The results
presented here can pave the way for future design and applications
of optoelectronic devices based on perovskite microarrays.