한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제52권2호
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  • Pages.90-95
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  • 2019
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
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Sn 첨가에 따른 CH3NH3PbBr3 페로브스카이트 나노입자의 광학적 특성

Optical Properties of Sn-doped CH3NH3PbBr3 Perovskite Nanoparticles

  • 신문렬 (충남대학교 신소재공학과) ;
  • 전민기 (충남대학교 신소재공학과) ;
  • 박혜린 (충남대학교 신소재공학과) ;
  • 최지훈 (충남대학교 신소재공학과)
  • 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)
  • 투고 : 2019.02.15
  • 심사 : 2019.03.26
  • 발행 : 2019.04.30
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초록

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.

키워드

PMGHBJ_2019_v52n2_90_f0001.png 이미지

Fig. 2. X-ray diffraction patterns of organic-inorganic perovskite nanocrystal (CH3NH3Pb1-xSnxCl2xBr3-2x) with a wide range (0-50%) of Sn doping contents.

PMGHBJ_2019_v52n2_90_f0002.png 이미지

Fig. 1. (a) X-ray diffraction pattern of organic-inorganic perovskite nanocrystal (CH3NH3PbBr3). Corresponding Miller indexes are labeled at the top of each diffraction peak. (b) PL emission (solid line) and UV-vis absorbance (dashed line) spectra with excitation wavelength (λex) of 365 nm. (c) Transmission electron micrograph of H3NH3PbBr3 nanocrystals.

PMGHBJ_2019_v52n2_90_f0003.png 이미지

Fig. 3. (a) PL emission (black solid lines: Sn-doped CH3NH3PbBr3, red solid lines: reference samples) and UV-vis absorbance (dashed line) spectra of organic-inorganic perovskite nanocrystal (CH3NH3Pb1-xSnxCl2xBr3-2x) with a wide range (0-90%) of Sn doping contents. (b) Maximum PL emission wavelength (λex) and the optical absorption edge wavelength as a function of the Sn doping contents (0-90%). (c) Stoke shift of CH3NH3Pb1-xSnxCl2xBr3-2x nanocrystals with a wide range (0-90%) of Sn doping contents.

PMGHBJ_2019_v52n2_90_f0004.png 이미지

Fig. 4. (a) Tauc plot and (b) corresponding energy band gap of organic-inorganic perovskite nanocrystal (CH3NH3Pb1-xSnxCl2xBr3-2x) with various Sn doping contents.

Table 1. Nominal compositions of the precursors

PMGHBJ_2019_v52n2_90_t0001.png 이미지

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