Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 42: Perovskite and Photovoltaics II (joint session HL/KFM)
HL 42.4: Talk
Thursday, March 21, 2024, 10:15–10:30, EW 203
Impact of different substrates and annealing treatments on the formation of fully evaporated perovskite — •Mohamed Mahmoud1,2, Martin Bivour1, Yashika Gupta1,2, Oussama Er-raji1,2, and Juliane Borchert1,2 — 1Fraunhofer ISE, Freiburg, Germany — 2University of Freiburg, Freiburg, Germany
Perovskite solar cells have the advantages of a strong absorption edge, defect tolerance, and potential cheap production. In the industry, a great interest is shown towards perovskite-silicon tandem solar cells to overcome the single junction limit. Double-sided textured (micro-meter sized pyramid) silicon is commonly produced to decrease reflection losses and improve light trapping. Solution-based processing methods of perovskite on top of the textured silicon showed low conformality, which resulted in shunts and non-working solar cells. To overcome this issue, physical vapor deposition (PVD) is used for the different precursors to conformally coat the perovskite on the silicon pyramids. Therefore, we study distinct vacuum-based methodologies for perovskite processing, specifically the hybrid route and the fully evaporated route. In this study, we investigate the effect of different substrates, that includes different materials and different Si pyramid heights, on the formation of fully evaporated perovskite. The results show that different surfaces (i.e. different materials) affects not only the morphology of the evaporated perovskite, but also the crystal structure. In addition to that, we compare planar Si surfaces to nano structured as well as micro structured on the formation of fully evaporated perovskite.
Keywords: Fully evaporated perovskite; hybrid route; perovskite-silicon tandem solar cells; additives