Ellipsometric study of the complex optical constants of a CsPbBr<sub>3</sub> perovskite thin film

Zhao, Ming; Shi, Yujun; Dai, Jun; Lian, Jie

doi:10.1039/c8tc03222j

Cited by 76 publications

(64 citation statements)

References 46 publications

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“…There are already many reports on the determination of the optical constants of organic–inorganic hybrid perovskites . There are also some reports regarding all‐inorganic perovskite thin films such as CsPbBr 3 and CsPbI 3 . However, looking into the reported refractive index ( n ) and extinction coefficient ( k ) of CsPbI 3 thin films in ref.…”

Section: The Extracted Parameters From the Best Fitting To Ellipsometmentioning

confidence: 99%

Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI₃ Perovskite Thin Films

Yan

Guo

Beri

et al. 2020

Physica Rapid Research Ltrs

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Air‐stable inorganic cesium lead iodide (CsPbI3) perovskite thin films with a bandgap of 1.7 eV are a promising candidate for tandem cell solar cells, comprising a perovskite top cell with a crystalline silicon bottom cell. The device design and simulations are important to develop high‐efficiency photovoltaic devices. However, knowledge of complex optical constants of the CsPbI3 thin films is mandatory to complement such tasks. Herein, air‐stable inorganic CsPbI3 perovskite thin films are prepared using one‐step synthesis through a spin‐coating method. Variable angle spectroscopic ellipsometry (VASE) is then conducted at five angles (43.9°, 48.9°, 53.9°, 58.9°, and 63.9°) to obtain ellipsometric data (Ψ and Δ). The thickness nonuniformity model of the perovskite thin film combined with an effective medium approximation for describing rough surface is adopted to achieve excellent fitting. The complex optical constants of the CsPbI3 thin film are experimentally obtained in the wavelength range of 300–1200 nm. The present results open the door for design and simulations on high‐efficiency CsPbI3/c‐Si tandem solar cells.

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Section: The Extracted Parameters From the Best Fitting To Ellipsometmentioning

confidence: 99%

Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI₃ Perovskite Thin Films

Yan

Guo

Beri

et al. 2020

Physica Rapid Research Ltrs

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“…14 − 17 The literature on the optical constants of lead bromide perovskites is limited to CsPbBr 3 or MAPbBr 3 single crystals. 18 − 21 In other cases, the study relies on nanocrystals rather than on millimeter-large single crystals. 22 …”

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confidence: 99%

Temperature-Dependent Optical Band Gap in CsPbBr₃, MAPbBr₃, and FAPbBr₃ Single Crystals

Mannino

Deretzis

Smecca

et al. 2020

J. Phys. Chem. Lett.

208

195

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Single crystals represent a benchmark for understanding the bulk properties of halide perovskites. We have indeed studied the dielectric function of lead bromide perovskite single crystals (MAPbBr 3 , CsPbBr 3 and for the first time FAPbBr 3 ) by spectroscopic ellipsometry in the range of 1–5 eV while varying the temperature from 183 to 440 K. An extremely low absorption coefficient in the sub-band gap region was found, indicating the high optical quality of all three crystals. We extracted the band gap values through critical point analysis showing that Tauc-based values are systematically underestimated. The two structural phase transitions, i.e., orthorhombic–tetragonal and tetragonal–cubic, show distinct optical behaviors, with the former having a discontinuous character. The cross-correlation of optical data with DFT calculations evidences the role of octahedral tilting in tailoring the value of the band gap at a given temperature, whereas differences in the thermal expansion affect the slope of the band gap trend as a function of temperature.

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“…In the area of organic-inorganic hybrid perovskites, there are already many reports regarding determination of the optical constants [14][15][16][17][18]. In contrast, the reports on the refractive index (n) and extinction coefficient (k) of all-inorganic perovskite thin films are rare [19,20]. In the work by Zhao et al it is noted that a high root-mean-square (RMS) surface roughness of 37.4 nm of the CsPbBr 3 films could result in an underestimation of the refractive index values (n = 1.93 at 525 nm) [19].…”

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confidence: 99%

Determination of complex optical constants and photovoltaic device design of all-inorganic CsPbBr₃ perovskite thin films

et al. 2020

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All-inorganic perovskites exhibit interesting properties and unprecedented stability compared to organic-inorganic hybrid lead halide perovskites. This work focuses on depositing and characterizing cesium lead bromide (CsPbBr 3) thin films and determining their complex optical constants, which is a key requirement for photovoltaic device design. CsPbBr 3 thin films are synthesized via the solution method followed by a hot-embossing step to reduce surface roughness. Variable angle spectroscopic ellipsometry measurements are then conducted at three angles (45°, 55°, and 65°) to obtain the ellipsometric parameters psi (Ψ) and delta (∆). For the present model, bulk planar CsPbBr 3 layer is described by a one-dimensional graded index model combined with the mixture of one Tauc-Lorentz oscillator and two Gaussian oscillators, while an effective medium approximation with 50% air void is adopted to describe surface roughness layer. The experimental complex optical constants are finally determined in the wavelength range of 300 to 1100 nm. Furthermore, as a design example demonstration, the simulations of single-junction CsPbBr 3 solar cells are conducted via the finite-difference time-domain method to investigate the properties of light absorption and photocurrent density.

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Ellipsometric study of the complex optical constants of a CsPbBr₃ perovskite thin film

Abstract: Complex optical constants and interband transitions of a hybrid perovskite CsPbBr3 thin film measured by spectroscopic ellipsometry.

Cited by 76 publications

References 46 publications

Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI₃ Perovskite Thin Films

Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI₃ Perovskite Thin Films

Temperature-Dependent Optical Band Gap in CsPbBr₃, MAPbBr₃, and FAPbBr₃ Single Crystals

Determination of complex optical constants and photovoltaic device design of all-inorganic CsPbBr₃ perovskite thin films

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Ellipsometric study of the complex optical constants of a CsPbBr3 perovskite thin film

Abstract: Complex optical constants and interband transitions of a hybrid perovskite CsPbBr3 thin film measured by spectroscopic ellipsometry.

Cited by 76 publications

References 46 publications

Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI3 Perovskite Thin Films

Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI3 Perovskite Thin Films

Temperature-Dependent Optical Band Gap in CsPbBr3, MAPbBr3, and FAPbBr3 Single Crystals

Determination of complex optical constants and photovoltaic device design of all-inorganic CsPbBr3 perovskite thin films

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Product

Resources

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Ellipsometric study of the complex optical constants of a CsPbBr₃ perovskite thin film

Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI₃ Perovskite Thin Films

Experimental Determination of Complex Optical Constants of Air‐Stable Inorganic CsPbI₃ Perovskite Thin Films

Temperature-Dependent Optical Band Gap in CsPbBr₃, MAPbBr₃, and FAPbBr₃ Single Crystals

Determination of complex optical constants and photovoltaic device design of all-inorganic CsPbBr₃ perovskite thin films