Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 45: HL Posters III

HL 45.15: Poster

Donnerstag, 4. April 2019, 18:30–21:00, Poster E

Simulation of electroreflectance spectra of CIGS solar cells — •Ellen Förstner1, Alice Magin1, Fabian Ruf1, Christian Huber1, Wolfram Witte2, Dimitrios Hariskos2, Oliver Kiowski2, Heinz Kalt1, and Michael Hetterich1,31Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70563 Stuttgart, Germany — 3Light Technology Institute, KIT, 76131 Karlsruhe, Germany

Thin-film solar cells such as Cu(In,Ga)Se2 (CIGS) offer an alternative to the widely spread silicon technology. Electroreflectance (ER) spectroscopy is a non-destructive tool enabling the investigation of their electronic properties. For instance, both the bandgap energy of absorber and buffer layer can be determined.

In this contribution, we present a numerical procedure developed to calculate ER spectra based on the model described in [1]. Electronic effects are modelled by SCAPS [2] and subsequently the modulated reflection signal is calculated using a transfer-matrix method. We further improve the simulation to achieve quantitative agreement with measured ER spectra and show applications of the procedure. Comparison of simulations with measured ER spectra allow for a conclusive interpretation of the experimental results.

[1] C. Huber et al., Phys. Rev. B 92, 075201 (2015).

[2] M. Burgelman et al., Thin Solid Films 361-362, 527-532 (2000).

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