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. 2021 Jan 4;8(4):2003334. doi: 10.1002/advs.202003334

Figure 6.

Figure 6

a) Absorption and steady‐state PL spectra of CsSnX3 (X = Cl, Cl0.5Br0.5, Br, Br0.5I0.5, I) nanocrystals. Reproduced with permission.[ 33b ] Copyright 2016, American Chemical Society. b) Absorption and PL spectra of Cs2SnI6 nanobelts under ambient conditions. Inset: a photograph of the colloidal solution of the Cs2SnI6 nanobelts under the excitation of 365 nm and the crystal structure of Cs2SnI6. Reproduced with permission.[ 70 ] Copyright 2016, American Chemical Society. c) PLQY of Cs2SnCl6:xBi3+ with x of 0%, 0.11%, 1.16%, 2.75%, 3.39%, 4.18%, and 6.63%. Inset: images of Cs2SnCl6:xBi3+ under 365 nm UV light illumination at room temperature. Reproduced with permission.[ 16e ] Copyright 2018, Wiley‐VCH. d) Normalized absorption, PLE (photoluminescence excitation) monitored at 620 nm, and PL spectra of the (OAm)2SnBr4 perovskite thin films. Inset: photograph of the colloidal suspension of (OAm)2SnBr4 perovskites under the excitation of UV light. Reproduced with permission.[ 86 ] Copyright 2019, American Chemical Society. e) Powder X‐ray diffraction patterns of (PEA)2SnI4 perovskite thin films. Inset: schematic of (PEA)2SnIxBr4− x perovskite crystal structure. f) Normalized absorption and PL spectra of (PEA)2SnI4, (PEA)2SnI3Br, (PEA)2SnI2Br2, (PEA)2SnIBr3, and (PEA)2SnBr4 perovskite thin films processed on glass from top to bottom. Inset: image of corresponding samples for different compositions. Reproduced with permission.[ 129 ] Copyright 2017, American Chemical Society. g) Absorption and PL spectra (λ ex = 375 nm) of tin perovskite nanodisks in toluene. Inset: photos of PEA2SnI4 (left), p‐FPEA2SnI4 (center), and TEA2SnI4 (right) nanodisks prepared under illumination with a 375 nm. h) Correlation plot of PLQY versus (ε w/ε b)2. ε w and ε b refer to the dielectric constants of well layers and barrier layers. Reproduced with permission.[ 44 ] Copyright 2019, American Chemical Society. i) Configurational coordinate diagram of the self‐trapping excitons in Cs4− xAxSn(Br1− yIy)6 (A = K, Rb). Inset: ground‐state and excited‐state (STE) HOMOs and LUMOs. Reproduced with permission.[ 133 ] Copyright 2018, Wiley‐VCH.