Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Synthesis and Characterization of Bandgap-modulated Organic Lead Halide Single Crystals

  • Park, Dae Young (Department of Energy Science, Sungkyunkwan University) ;
  • Byun, Hye Ryung (Department of Energy Science, Sungkyunkwan University) ;
  • Lee, A Young (Department of Energy Science, Sungkyunkwan University) ;
  • Choi, Ho Min (Department of Energy Science, Sungkyunkwan University) ;
  • Lim, Seong Chu (Department of Energy Science, Sungkyunkwan University) ;
  • Jeong, Mun Seok (Department of Energy Science, Sungkyunkwan University)
  • Received : 2018.09.12
  • Accepted : 2018.09.28
  • Published : 2018.11.30
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Abstract

Single crystal of organic lead halide ($CH_3NH_3PbX_3$; $CH_3NH^+_3$ = methylammonium (MA), $X=Cl^-$, $Br^-$, $I^-$) is the best candidate for material intrinsic property studies due to no grain boundary and high crystal quality than the film having a lot of grain boundary and surface defects. The representative crystallization methods are inverse temperature crystallization (ITC) and anti-solvent vapor assisted crystallization (AVC). Herein, we report bandgap modulated organic lead halide single crystals having a bandgap ranging from ~ 2.1 eV to ~ 3 eV with ITC and AVC methods. The bandgap modulation was achieved by controlling the solvents and chloride-to-bromide ratio. Structural, optical and compositional properties of prepared crystals were characterized. The results show that the crystals synthesized by the two crystallization methods have similar properties, but the halide ratios in the crystals synthesized by the AVC method are controlled more quantitatively than the crystals synthesized by ITC.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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  2. Defect states of organic lead halide single crystals grown by inverse-temperature crystallization vol.115, pp.15, 2018, https://doi.org/10.1063/1.5100952