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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: Organic Electronics and Photovoltaics III (joint session CPP/HL)

CPP 43.6: Vortrag

Donnerstag, 30. März 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.