Dresden 2020 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 30: Poster: Organic Thin Films and Thin Oxides
DS 30.3: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P1A
Photoelectron spectroscopy on characterisation and phosphonic — •Adriana Salazar1,2, Valentina Rohnacher1,2, Markus Frericks2,4, Wolfram Jaegermann4, and Wolfgang Kowalsky1,2,3 — 1Kirchhoff Institute for Physics, Uni Heidelberg, Germany — 2InnovationLab, Heidelberg, Germany — 3Institute for High-Frequency Technology, TU Braunschweig, Germany — 4Materials Science Department, TU Darmstadt, Germany
Hole and electron transport layers (HTL /ETL) are necessary for stable and efficient perovskite solar cells (PSCs). Tin Oxide (SnOx) is a promising candidate as ETL due to its suiting electron affinity which leads to an excellent interface with the perovskite absorber material. Further, SnOx owns a high electron mobility, high transmittance and high chemical stability, essential criteria for efficient PSCs.
In these studies, solution processed tin oxide thin films were investigated. Using photoelectron spectroscopy different states of the thin film preparation could be investigated. Here, this surface sensitive technique allows for a chemical analysis while also providing information about the electronic structure. To tune the work function and to reduce the surface reactivity, SnOx thin films were modified by self-assembled monolayers (SAMs) of 4'-(Dimethylamino)-3,5-difluoro-[1,1'-biphenyl]-4-yl)phosphonic acid (XFPA). Together with results from contact angle measurement, atomic force microscopy and infrared spectroscopy, a better understanding about the SAM formation and surface modification was achieved.