Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 27: Focus Session: Perspectives in Cu(In,Ga)Se 1

Thursday, September 8, 2022, 09:30–11:00, H33

The chalcopyrite Cu(In,Ga)Se2 is currently one of the few photovoltaic materials with an active participation in the market share of thin-film technologies, offering also the advantage of having a low production carbon footprint. After a rapid increase in its record power conversion efficiency during the last decade, the technology seems to have stagnated at 23.4 percent, a record achieved in 2019. Several strategies, which have been partially responsible of the newest record efficiencies, have been developed in order to push Cu(In,Ga)Se2 further by targeting the improvement of the bulk properties and the interfaces: post-deposition treatments with heavy alkali metal fluorides, incorporation of other metals like silver and the mixture with other chalcogens like sulfur, are just some examples. The aim of this focus session is to bring Cu(In,Ga)Se2 experts together in order to discuss the current limitations and propose new routes and concepts that could lead to a further improvement in this technology.

Organized by AK-jDPG (Aubin Prot, Omar Ramirez and Taowen Wang)

	09:30	HL 27.1	Invited Talk: What limits state-of-the-art chalcopyrite solar cells? — •Susanne Siebentritt
	10:00	HL 27.2	Invited Talk: Approaches to improve CIGS absorber quality and the CIGS/buffer interface to reach 24% efficiency and beyond — •Wolfram Witte
	10:30	HL 27.3	Role of Na in interconnection between chemical composition and electrical properties of grain boundaries in Cu(In, Ga)Se2 — •Azam Karami, Marcin Morawski, Heiko Kempa, Roland Scheer, and Oana Cojocaru-Mirédin
	10:45	HL 27.4	Electronic properties of the back contact in Cu(In,Ga)Se2 solar cells — Torsten Hölscher, Thomas Schneider, Merve Demir, Julia Horstmann, Melina Kristen, Heiko Kempa, and •Roland Scheer