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

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

doi:10.3788/COL202119.103001

Journals >Chinese Optics Letters >Volume 19 >Issue 10 >Page 103001 > Article

Chinese Optics Letters
Vol. 19, Issue 10, 103001 (2021)

Identifying self-trapped excitons in 2D perovskites by Raman spectroscopy [Invited] | Editors' Pick

Junze Li, Junchao Hu, Jiaqi Ma, Xinglin Wen, and 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

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DOI: 10.3788/COL202119.103001 Cite this Article Set citation alerts

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 Copy Citation Text

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

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

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