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

Yan, Wensheng; Guo, Yi; Beri, Deski; Dottermusch, Stephan; Chen, Haining; Richards, Bryce S.

Abstract:
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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Verlagsausgabe §
DOI: 10.5445/IR/1000118335
Veröffentlicht am 17.07.2020
Originalveröffentlichung
DOI: 10.1002/pssr.202000070
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1862-6254
KITopen-ID: 1000118335
HGF-Programm 43.23.04 (POF III, LK 01)
Nanophotonics for Energy Conversion
Erschienen in Physica status solidi / Rapid research letters
Band 14
Heft 6
Seiten Art.-Nr.: 2000070
Vorab online veröffentlicht am 30.03.2020
Nachgewiesen in Scopus
Web of Science
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