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

Yan, Wensheng; Mao, Lingyun; Zhao, Peiyang; Mertens, Adrian; Dottermusch, Stephan; Hu, Hang; Jin, Zhong; Richards, Bryce S.

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 (CsPbBr3) thin films and determining their complex optical constants, which is a key requirement for photovoltaic device design. CsPbBr3 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 CsPbBr3 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 CsPbBr3 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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Verlagsausgabe §
DOI: 10.5445/IR/1000119286
Veröffentlicht am 05.07.2020
DOI: 10.1364/OE.392246
Zitationen: 2
Web of Science
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2020
Sprache Englisch
Identifikator ISSN: 1094-4087
KITopen-ID: 1000119286
HGF-Programm 43.23.04 (POF III, LK 01) Nanophotonics for Energy Conversion
Erschienen in Optics express
Verlag Optical Society of America (OSA)
Band 28
Heft 10
Seiten 15706-15717
Vorab online veröffentlicht am 08.05.2020
Nachgewiesen in Web of Science
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