SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 39: Organic Electronics and Photovoltaics III (joint session CPP/HL)
HL 39.6: Talk
Thursday, March 30, 2023, 10:45–11:00, GÖR 226
Investigation of high performance organic photodetectors based on single component photoactive layer — •Jakob Wolansky1, Cedric Hoffmann2, Felix Talnack3, Michel Panhans4, Donato Spoltore5, Stefan C.B. Mannsfeld3, Frank Ortmann4, Natalie Banerji2, Johannes Benduhn1, and Karl Leo1 — 1IAPP, TU Dresden — 2University of Bern — 3Cfaed, TU Dresden — 4TU Munich — 5University of Parma
In organic semiconductor applications such as organic photovoltaics and photodetectors, an intermolecular interface with an energetic gradient between electron donating and accepting materials is usually required for efficiently generating charges. This driving force facilitates the dissociation of the photogenerated excitons. At the same time, this energy offset reduces the maximum possible open-circuit voltage, and the additional interface can act as a recombination site and increases the dark current. Therefore, single-component devices are extensively researched to overcome these drawbacks.
Here, we report on single-component devices that perform very well as organic photodetectors. By utilizing different device processing parameters and employing different interface layers, we optimized the device characteristics such as external quantum efficiency, dark current, and specific detectivities of more than 1e13 Jones. Investigations of the morphology, combined with ultrafast transient absorption measurements, give insight into the charge generation mechanism in our material system.