Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster I

CPP 17.20: Poster

Montag, 9. März 2026, 19:00–21:00, P5

Narrowband organic Photodetectors with J-Aggregate materials — •Angelina Stoer¹, Jakob Wolansky¹, Matthias Stolte², Frank Würthner², Karl Leo¹, and Johannes Benduhn¹ — ¹Institut für Angewandte Physik und Photonik, TU Dresden — ²Institut für Organische Chemie, Universität Würzburg

With the development of organic photodetectors, new opportunities for narrowband photodetection have emerged. Instead of relying on costly and unwieldy optical filters, the molecular structure of organic materials can be chemically tailored to tune their absorption range. Recently, the material class of merocyanine dyes has been investigated as a promising candidate for this purpose, exhibiting favorable absorption properties. By post-annealing these dyes, the molecules can rearrange and form J-aggregated thin films, resulting in a narrowband absorption spectrum due to the intermolecular interactions.

In this work, the merocyanine dye 1(Hex) is used in fully vapor-deposited organic photodetectors. Narrowband detection with a FWHM as low as 15 nm could be realized at a center wavelength of 755 nm. Through careful optimization of the heating conditions and device structure, a notable external quantum efficiency was achieved, accompanied by very low noise at zero voltage. Based on this, the resulting specific detectivity exceeds 10¹² Jones. The comprehensive photodetector characterization is complemented by an in-depth analysis of changes in the thin film‘s morphology and energetics induced by the J-aggregation formation process.

Keywords: organic electronics; narrowband photodetection; near-infrared sensitivity; J-aggregates; merocyanine dyes