Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 4: Perovskite and Photovoltaics: Synthesis and Performance
HL 4.5: Talk
Monday, March 9, 2026, 10:45–11:00, POT/0251
A Materials Perspective on Sequential Inorganic Scaffold Deposition for Hybrid-Processed Perovskite Thin Films — •Ronja Pappenberger1,2, Julian Petry1,2, Alexander Welle3,4, Tonghan Zhao1, Alexander Diercks2, Raphael Pesch1,2, Paul Fassl1,2, and Ulrich W. Paetzold1,2 — 1Institute of Microstructure Technology, KIT, Germany — 2Light Technology Institute, KIT, Germany — 3Institute of Functional Interfaces, KIT, Germany — 4Karlsruhe Nano Micro Facility, KIT, Germany
As perovskite solar cells (PSCs) advance toward industrial-scale production, fabrication processes must combine high-throughput with simple integration. In this regard, the hybrid two-step deposition route has emerged as a promising method, allowing for conformal coatings on micron-scale textures, a critical feature for perovskite/silicon tandem photovoltaics. This work presents a fully sequential route, wherein the inorganic materials CsCl and PbI2 are deposited separately, simplifying industrial implementation compared to co-deposition. Microstructural analysis shows that sequential deposition promotes vertical PbI2 growth with a secondary tilted orientation, unlike the horizontal orientation from co-deposition. Elemental distribution reveals high diffusivity for Cs, formamidinium, and I, yielding a homogeneous distribution in the perovskite absorber, while Pb and Cl remain largely scaffold-bound. PSCs with a 1.69 eV bandgap achieve efficiencies of 19.3% (co-deposition) and 18.7% (sequential), highlighting fully sequential hybrid deposition as a promising route toward industrial PSC production.
Keywords: perovskite solar cell; hybrid route; vacuum deposition; microstructure; crystallinity