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Yan, Wensheng; Mao, Lingyun; Zhao, Peiyang; Mertens, Adrian; Dottermusch, Stephan; Hu, Hang; Jin, Zhong; Richards, Bryce S
Optics express, 2020-May-11, 2020-05-11, Volume: 28, Issue: 10Journal Article
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 ) thin films and determining their complex optical constants, which is a key requirement for photovoltaic device design. CsPbBr 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 (Δ). For the present model, bulk planar CsPbBr 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 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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