Effects on the emission discrepancy between two-dimensional Sn-based and Pb-based perovskites

Tianju Zhang; Chaocheng Zhou; Jia Lin; Jun Wang

doi:10.3788/COL202220.021602

Chinese Optics Letters, Volume. 20, Issue 2, 021602(2022)

Effects on the emission discrepancy between two-dimensional Sn-based and Pb-based perovskites

Tianju Zhang^1,2, Chaocheng Zhou^3,4, Jia Lin^3、**, and Jun Wang^1,2,5、*

¹Laboratory of Micro-Nano Optoelectronic Materials and Devices, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²Center of Materials Science and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

³Department of Physics, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China

⁴State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

⁵CAS Center for Excellence in Ultra-Intense Laser Science, Shanghai 201800, China

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Fig. 1. Spectral characteristics of (BA)₂BI₄ (B: Sn/Pb) perovskites. (a) Schematic of the hybrid quantum-well structure of the crystal structure, showing the perovskite octahedra sandwiched between organic spacer molecules (BA⁺). The UV-visible (UV-Vis) absorption, steady-state photoluminescence (PL) spectra of (b) (BA)₂SnI₄ and (c) (BA)₂PbI₄. (d) PLQY of (BA)₂SnI₄ and (BA)₂PbI₄.

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Fig. 2. Analysis of PL characteristics. (a) Multi-peak fit analysis of (BA)₂PbI₄, (b) multi-peak fit analysis of (BA)₂SnI₄, (c) percentage of subpeaks of (BA)₂PbI₄ and (BA)₂SnI₄, (d) normalized PL decay kinetics.

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Fig. 3. Temperature dependence of the steady-state PL spectra. Contour map of the temperature-dependent steady-state PL spectra of (a) (BA)₂SnI₄ and (b) (BA)₂PbI₄. Fitting of the temperature-dependent FWHM of (c) (BA)₂SnI₄ and (d) (BA)₂PbI₄. The red fitting line of the data (blue point) is obtained by Eq. (1).

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Fig. 4. Carrier relaxation dynamics. False-color 2D TA mappings of (a) (BA)₂SnI₄ and (b) (BA)₂PbI₄. Evolution-associated spectra (EAS) obtained upon global analysis of the TA data of (c) (BA)₂SnI₄ and (d) (BA)₂PbI₄. Decay-associated spectra (DAS) obtained by performing global analysis on the TA spectra of (e) (BA)₂SnI₄ and (f) (BA)₂PbI₄. The inset shows the results of fitting the band-edge exciton relaxation dynamics.

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Table 1. Best-Fitting Parameters of the (BA)₂SnI₄ and (BA)₂PbI₄ Perovskites
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Table 1. Best-Fitting Parameters of the (BA)₂SnI₄ and (BA)₂PbI₄ Perovskites
Sample $Γ_{0}$ (meV) $Γ_{LO}$ (meV) $E_{LO}$ (meV) $E_{imp}$ (meV)
${(BA)}_{2} {SnI}_{4}$ $63.1 \pm 2$ $192.8 \pm 4$ $56.5 \pm 2$ $94.9 \pm 2$
${(BA)}_{2} {PbI}_{4}$ $37.7 \pm 1$ $14.5 \pm 2$ $20.85 \pm 1$ $188.3 \pm 2$

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Tianju Zhang, Chaocheng Zhou, Jia Lin, Jun Wang, "Effects on the emission discrepancy between two-dimensional Sn-based and Pb-based perovskites," Chin. Opt. Lett. 20, 021602 (2022)

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