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O: Fachverband Oberflächenphysik

O 25: Organic Molecules on Inorganic Substrates III: Adsorption & Growth

O 25.8: Vortrag

Dienstag, 19. März 2024, 12:15–12:30, MA 043

Molecular self-assembly of C60 on CsPbBr3(100) — •Hannah Loh, Andreas Raabgrund, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

CsPbBr3 is a promising alternative to organic-inorganic perovskites in solar cells. Aiming at higher efficiencies, the band alignment of the perovskites and the transport layers within the solar cell are a crucial parameter [1]. Evaporating the single components CsBr and PbBr2 in a 1:1 stoichiometry, thin CsPbBr3 films grow epitaxially in a (2×2) cell with respect to Au(100). For coverages greater than 5 ML two surface reconstructions, (2×2) and (2√2×√2)R45, of the CsPbBr3(100) are found [2].

In this contribution we exploit these films to investigate the self assembly of C60, which is a known electron transport material in solar cells, on CsPbBr3/Au(100) by STM, LEED and DFT. For submonolayer coverage of C60 we find hexagonal closed-packed islands with different alignments with respect to the substrate that are not influenced by the reconstruction. The C60 molecules within the islands show rotational orientation without apparent lateral order. After annealing to 420 K the islands become multilayer structures. STS measurements reveal a bandgap of 2.8±0.1 eV for CsPbBr3 and molecular states at 0.9±0.1 eV (LUMO) and at 2.3±0.1 eV (LUMO+1) in the monolayer C60 configuration.
[1] Schmidt-Mende et al., APL Materials, 9, 109202 (2021)
[2] Rieger J. et al., Phys. Rev. Mat, 7, 035403 (2023)

Keywords: CsPbBr3; C60; Perovskite Solar Cells

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