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http://dx.doi.org/10.5695/JKISE.2019.52.2.90

Optical Properties of Sn-doped CH3NH3PbBr3 Perovskite Nanoparticles  

Sihn, Moon Ryul (Department of Materials Science and Engineering, Chungnam National University)
Jeon, Mingi (Department of Materials Science and Engineering, Chungnam National University)
Park, Hyerin (Department of Materials Science and Engineering, Chungnam National University)
Choi, Jihoon (Department of Materials Science and Engineering, Chungnam National University)
Publication Information
Journal of the Korean institute of surface engineering / v.52, no.2, 2019 , pp. 90-95 More about this Journal
Abstract
Methylammonium lead bromide ($MAPbBr_3$) has attracted a lot of attention due to their excellent optoelectronic properties such as the compositional flexibility relevant to photoluminescence (PL) and UV-Vis absorbance spectrum, high diffusion length, and photoluminescence quantum yield (PLQY). Despite such advantages of organic-inorganic perovskite materials, more systematic study on manipulation of their optoelectronic properties in homo- or heterovalent metal ions doped halide perovskite nanocrystals is lacking. In this study, we systematically investigated the optical properties of colloidal $CH_3NH_3Pb_{1-x}Sn_xCl_{2x}Br_{3-2x}$ particles by addition of $SnCl_2$ into the typical methylammonium lead tribromide ($CH_3NH_3PbBr_3$) precursor solution. We found that only 1% addition of $SnCl_2$ shows a significant blue-shift from 540 nm to 420 nm in UV-Vis absorbance spectrum due to the strong quantum confinement effect. Furthermore, continuous blue-shift in photoluminescence spectra was observed as the amount of Cl increases. These experimental results provide new insights into the replacement of Pb within $MAPbBr_3$, required for the broadening of their application.
Keywords
$CH_3NH_3PbBr_3$; $SnCl_2$; photoluminescence; lead-free;
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