Spectroscopic ellipsometry study of Cu2ZnSn(SxSe1-x)4 bulk polycrystals

• Published in: Journal of alloys and compounds Vol. 843; p. 156013
• Main Authors: Levcenko, Sergiu, Hajdeu-Chicarosh, Elena, Serna, Rosalía, Guc, Maxim, Victorov, Ivan A., Nateprov, Alexandr, Bodnar, Ivan V., Caballero, Raquel, Merino, José Manuel, Arushanov, Ernest, León, Máximo
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 30.11.2020; Elsevier BV
• Subjects: Ellipsometry; Kesterites; Optical spectroscopy; Photovoltaic cells; Polycrystals; Raman spectroscopy; Room temperature; Semiconductor compounds; Solar cells; Spectroellipsometry; Sulfur content; Polycrystals; Semiconductor compounds; Optical spectroscopy; Raman spectroscopy; Kesterites; Ellipsometry
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.156013

The pseudo dielectric function of Cu2ZnSn(SxSe1-x)4 [x = 0.35, 0.62, 0.81] bulk polycrystals is determined over the range 1.1–4.6 eV at room temperature from the analysis of spectroscopic ellipsometry data using the Adachi model. From the analysis, the lowest E0 transition and high energy E1A and E1B transitions are clearly identified, and used to follow the evolution of the pseudo dielectric function as a function of the composition. It is shown that the fundamental E0 and high energy E1A transitions can be tuned by increasing the sulfur content over a range of 0.3 eV. These results show the potential of the kesterite compounds for the design of efficient tailored photovoltaic solar cells. •Spectroscopic ellipsometry of Cu2ZnSn(SxSe1-x)4 bulk polycrystals are measured.•Analysis of spectroscopic ellipsometry data is performed using the Adachi model.•Dielectric functions are determined over the range 1.1–4.6 eV at room temperature.•Nonlinear increasing of Eg with increasing S content is obtained.