Dresden 2014 – scientific programme
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DS: Fachverband Dünne Schichten
DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials
DS 35.28: Poster
Wednesday, April 2, 2014, 17:00–20:00, P1
FDTD Simulations for Optimization of Light-Management in Thin-Film Solar Cells — •Benjamin Fries1,2, Jonathan Lehr1,2, Ruben Hünig2, Heinz Kalt1, Michael Powalla2,3, and Michael Hetterich1 — 1Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Light Technology Institute, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 3Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70565 Stuttgart, Germany
Thin-film solar cells made of Cu(In,Ga)Se2 (CIGS) have reached a high level of both energy conversion efficiency (20.8 %) and commercial cost-effectiveness. Yet a number of aspects remain to be understood and optimized. In this contribution we present a numerical model of a CIGS solar cell being developed in order to investigate the effects of minority carrier collection as well as light-management on the external quantum efficiency (EQE). Experimental data for the latter could be reproduced employing a finite-difference time-domain (FDTD) method. Surface-patterning of a solar cell lead to an experimentally observed increase in short-circuit current which could also be simulated successfully.