Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 61: Perovskite and photovoltaics III (joint session HL/CPP)

CPP 61.1: Talk

Wednesday, March 18, 2020, 09:30–09:45, POT 251

Efficiency dependence on incident angle for CIGS solar cells — •Lilén Vöhringer¹, Janet Neerken¹, Hippolyte Hirwa¹, Jörg Ohland¹, Alfons Weber², Robert Lechner², Thomas Dalibor², Sascha Schäfer¹, and Stephan Heise¹ — ¹Ultrafast Nanoscale Dynamics, Institute of Physics, University of Oldenburg, D-26111 Oldenburg, Germany — ²Avancis GmbH, Otto-Hahn-Ring 6, D-81739 München, Germany

Facing climate change, renewable energies are becoming more and more relevant. Hence, understanding their mechanisms in detail is important to improve their use. In photovoltaics, solar cells are used to convert solar energy into electrical energy. In general, the efficiency of a solar cell is measured and compared under standard test conditions, which may vary vastly from real conditions. Hence, it is important to investigate the dependence of the efficiency on different parameters, in order to find the best solar cell for each case of non-standard conditions. One of these parameters is the incident angle of light, which varies according to the suns position, but also depends on the orientation of the solar cell. Its influence on the efficiency is being tested in this study for Cu(In,Ga)(S,Se)₂ (CIGS) solar cells using IV-measurements. CIGS solar cells are thin-film solar cells which can reach efficiencies up to 23%. In particular, the role of the front glass for the angular-dependent efficiency is studied by investigating different front glass variations. The measurements show that the efficiency dependence on the incident angle cannot be explained by the reduced photon flux only.