SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 4: Perovskite and photovoltaics I (joint session HL/CPP)
HL 4.6: Vortrag
Montag, 27. März 2023, 11:15–11:30, JAN 0027
Employing three-dimension structure analysis: digital twin for studying grain boundary effects in thin film solar cells — •Chang-Yun Song1, Matthias Maiberg1, Heiko Kempa1, Ali Gholinia2, Wolfram Witte3, Dimitrios Hariskos3, Daniel Abou-ras4, and Roland Scheer1 — 1Martin-Luther-University Halle-Wittenberg, Halle, D — 2University of Manchester, Manchester, UK — 3Zentrum für Sonnenenergie- und Wasserstoff-Forschung, Stuttgart, D — 4Helmholtz-Zentrum Berlin, Berlin, D
Grain boundaries (GBs) in polycrystalline Cu(In,Ga)Se2 (CIGSe), are believed to be one of the performance limiting factors of current record efficiency CIGSe solar cells. Numerous simulation studies have been conducted to unveil their effects. Most simulations, however, have been done within two-dimensions (2D), thereby presumably using the simplified GBs shapes. In this study, we thus present a realistic three-dimensional (3D) GB model for a high-efficiency CIGSe layer. To this end, a combination of electron backscatter diffraction and focused ion beam was applied to obtain 3D data of the CIGSe layer, which then allowed the reconstruction of the 3D grain structure into a computer model. By using the computer model as input for 3D optoelectronic simulations, we study the electronic effects of GBs on the high-efficiency solar cell under investigation bulk parameter values for the simulations were obtained through a combination of simulation and experiments, such that the solar cell is consistently described. As an outcome, the 3D simulations confirm that the effect of GB was indeed underestimated in earlier conventional 2D simulations.