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HL: Fachverband Halbleiterphysik

HL 39: Organic Electronics and Photovoltaics III (joint session CPP/HL)

HL 39.5: Vortrag

Donnerstag, 30. März 2023, 10:30–10:45, GÖR 226

Realizing a high-performance, fully thermal-evaporated, blue narrowband organic photodetector — •Tianyi Zhang, Johannes Benduhn, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, Dresden, Germany

Organic photodetector (OPD) boasts of its tunable absorption window, mechanical flexibility, transparency, non-toxicity, facile processing, and cheaper cost. Recent development of high-performing polymers and small molecules further reveals its potential in numerous communication and biomedical applications. To realize visible light communication, commercially available inorganic photodetector usually incorporates additional optical filters, which further increases the complexity and cost of the sensing system. Therein, we demonstrate a blue absorbing organic photodetector with ultrahigh specific detectivity (D^*) approaching 10¹⁴ Jones. By employing a wide bandgap hole transporting layer BF-DPB with Rubrene:C₆₀ active layer, the absorption peaks at 450nm with an external quantum efficiency (EQE) of 50% at zero bias. The parasitic absorption renders the narrowband characteristic of the blends to span merely over the blue wavelength region. Upon BF-DPB incorporation, ultrafast responses are also observed at sub-microseconds. We conclude that the judicious choice of transporting layer is critical for achieving application-tailored properties, namely high speed or high D^*. To date, those values are among the best-reported blue OPDs.