Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Organic molecules on inorganic substrates: Adsorption and growth – Poster

O 45.6: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

Tuning molecular self-assembly of BDA on CsPbBr₃(100) — •Hannah Loh, Milan Möller, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

CsPbBr₃ is a promising alternative to organic-inorganic perovskites in solar cells and light emitting diodes [1]. In these devices, organic layers are often used as charge transport layers and hence interface properties are of particular interest. Depending on the termination of the CsPbBr₃ substrate [2] the adsorption properties can be tuned [3].

In this contribution we invesitgate the self assembly of 4-4-biphenyl dicarboxylic acid (BDA) on epitaxial CsPbBr₃ thin films on Au(100). Independent of surface termination the BDA molecules lie flat and form compact islands. On the CsBr-terminated surface, molecules follow a head to tail hydrogen-bridge stabilized arrangement. The interaction with the PbBr terminated surface is stronger causing partially a slight tilt of the molecules to adapt to the substrate unit cell and deprotonation.

[1] Bao C. et al., Organic Electronics, 73, 299-303 (2019)
[2] Rieger J. et al., Phys. Rev. Mat, 7, 035403 (2023)
[3] Loh H. et al., ACS Nano, 19, 10199-10206 (2025)

Keywords: Perovskite; CsPbBr3; carboxylic acid; BDA