Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
Quantum confinement of nanoscale perovskite materials manifests in unique optical and electronic properties compared to its bulk. Herein, we have attempted to investigate the photo-physics and electrical conductivity of all-inorganic lead halide perovskite specifically, CsPbBr3 capped with an aromatic ligand (phenethylamine, PEA). Interestingly, the tunable optical properties are explicated by just alteration of its concentration. With the increasing concentration of PEA-capped CsPbBr3, a wide range of red-shift is obtained in both absorption peak (360 nm to 505 nm) and photoluminescence (PL) measurement (420 nm to 510 nm). Furthermore, the time-resolved PL lifetime decay illustrates a sequential increase in the average PL lifetime from 4.8 ns to 20.1 ns as the concentration of PEA-capped CsPbBr3 increases. This is attributed to the steady crystal growth in its size and shape evolving from nanocrystals (with the size of 100 nm-200 nm) to microcrystals (~10 μm) as is evidenced in field emission scanning electron microscope (FESEM) images. The concentration-dependent behavior is tested for its charge transport behavior as well and has been observed to have marked enhancement in their electrical conductivity for the enlarged CsPbBr3 crystals. These outcomes are evident in the crystal growth of CsPbBr3 from nano- to micro-crystals and can provide insight into many unanswered dimension-controlled optoelectronic behavior.
The authors acknowledge the Science and Engineering Research Board, Govt. of India, for a Research grant under sanction ECR/2016/002036. LM acknowledges fellowships from IIT Patna.
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