Identifying self-trapped excitons in 2D perovskites by Raman spectroscopy [Invited]

Junze Li; Junchao Hu; Jiaqi Ma; Xinglin Wen; Dehui Li

doi:doi:10.3788/COL202119.103001

Chinese Optics Letters, 2021, 19 (10): 103001, Published Online: Jul. 23, 2021

Identifying self-trapped excitons in 2D perovskites by Raman spectroscopy [Invited] Download： 632次

Junze Li Junchao Hu Jiaqi Ma Xinglin Wen Dehui Li ^*

Author Affiliations

School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

Figures & Tables

Fig. 1. (a) Schematic of ${(PEA)}_{2} {PbI}_{4}$ crystal structure. (b) Optical microscope image of the as-synthesized crystal. Scale bar: 2 mm. (c) Powder XRD pattern of as-synthesized crystals. (d) Optical microscope image of an exfoliated flake. Scale bar: 10 µm.

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Fig. 2. PL spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal under different excitation at 80 K.

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Fig. 3. PL spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal excited by (a) 2.33 eV and (b) 1.96 eV lasers at different temperatures.

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Fig. 4. Raman spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal under 2.33 eV (black) and 1.96 eV (red) laser excitation at 80 K. The positions of all peaks are $76 {cm}^{- 1} (P_{1})$ , $102.5 {cm}^{- 1} (P_{2})$ , $134 {cm}^{- 1} (P_{3})$ (non-excited state), and $79.6 {cm}^{- 1} (P_{1})$ , $108.5 {cm}^{- 1} (P_{2})$ , $134 {cm}^{- 1} (P_{3})$ , $160.8 {cm}^{- 1} (P_{4})$ (excited state).

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Fig. 5. Temperature-dependent Raman spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal under non-excited states excited by (a) 1.96 eV and (b) 2.33 eV lasers, respectively.

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Fig. 6. Raman peak versus temperature extracted from Fig. 5. The gray dot lines are used to guide the eye.

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Fig. 7. Raman spectra of ${(PEA)}_{2} {PbBr}_{4}$ under 2.33 eV (black) and 1.96 eV (red) laser excitation at 80 K.

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Junze Li, Junchao Hu, Jiaqi Ma, Xinglin Wen, Dehui Li. Identifying self-trapped excitons in 2D perovskites by Raman spectroscopy [Invited][J]. Chinese Optics Letters, 2021, 19(10): 103001.

Identifying self-trapped excitons in 2D perovskites by Raman spectroscopy [Invited] Download： 632次

Fig. 1. (a) Schematic of ${(PEA)}_{2} {PbI}_{4}$ crystal structure. (b) Optical microscope image of the as-synthesized crystal. Scale bar: 2 mm. (c) Powder XRD pattern of as-synthesized crystals. (d) Optical microscope image of an exfoliated flake. Scale bar: 10 µm.

Fig. 2. PL spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal under different excitation at 80 K.

Fig. 3. PL spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal excited by (a) 2.33 eV and (b) 1.96 eV lasers at different temperatures.

Fig. 5. Temperature-dependent Raman spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal under non-excited states excited by (a) 1.96 eV and (b) 2.33 eV lasers, respectively.

Fig. 6. Raman peak versus temperature extracted from Fig. 5. The gray dot lines are used to guide the eye.

Fig. 7. Raman spectra of ${(PEA)}_{2} {PbBr}_{4}$ under 2.33 eV (black) and 1.96 eV (red) laser excitation at 80 K.

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Identifying self-trapped excitons in 2D perovskites by Raman spectroscopy [Invited] Download： 632次

Fig. 1. (a) Schematic of (PEA)2PbI4 crystal structure. (b) Optical microscope image of the as-synthesized crystal. Scale bar: 2 mm. (c) Powder XRD pattern of as-synthesized crystals. (d) Optical microscope image of an exfoliated flake. Scale bar: 10 µm.

Fig. 2. PL spectra of a (PEA)2PbI4 crystal under different excitation at 80 K.

Fig. 3. PL spectra of a (PEA)2PbI4 crystal excited by (a) 2.33 eV and (b) 1.96 eV lasers at different temperatures.

Fig. 5. Temperature-dependent Raman spectra of a (PEA)2PbI4 crystal under non-excited states excited by (a) 1.96 eV and (b) 2.33 eV lasers, respectively.

Fig. 6. Raman peak versus temperature extracted from Fig. 5. The gray dot lines are used to guide the eye.

Fig. 7. Raman spectra of (PEA)2PbBr4 under 2.33 eV (black) and 1.96 eV (red) laser excitation at 80 K.

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Fig. 1. (a) Schematic of ${(PEA)}_{2} {PbI}_{4}$ crystal structure. (b) Optical microscope image of the as-synthesized crystal. Scale bar: 2 mm. (c) Powder XRD pattern of as-synthesized crystals. (d) Optical microscope image of an exfoliated flake. Scale bar: 10 µm.

Fig. 2. PL spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal under different excitation at 80 K.

Fig. 3. PL spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal excited by (a) 2.33 eV and (b) 1.96 eV lasers at different temperatures.

Fig. 5. Temperature-dependent Raman spectra of a ${(PEA)}_{2} {PbI}_{4}$ crystal under non-excited states excited by (a) 1.96 eV and (b) 2.33 eV lasers, respectively.

Fig. 7. Raman spectra of ${(PEA)}_{2} {PbBr}_{4}$ under 2.33 eV (black) and 1.96 eV (red) laser excitation at 80 K.