Regensburg 2019 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 66: Organic Electronics and Photovoltaics V - Semiconducting Properties and Devices

CPP 66.6: Talk

Friday, April 5, 2019, 11:30–11:45, H18

Remote doping at organic heterointerface — •Ilia Lashkov, Kevin Krechan, Katrin Ortstein, Hans Kleemann, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials, Nöthnitzer Str. 61, 01187 Dresden, Germany

Organic and molecular electronics is a novel field of microelectronics that provides the possibility of producing electronic devices onto flexible substrates and at a low process temperature. However, organic thin-film transistors suffer from a low charge carrier mobility which lowers their potential for applications. Both problems have been successfully solved in inorganic electronics by the concept of remote doping. In our work, we investigate remote doping at a junction between two organic semiconductors with a different energy gap. The offset of valence states leads to charge carrier transfer from the wide gap semiconductor. Charge transfer at the interface between the organic semiconductors is investigated by in-situ conductivity measurements during film deposition. We directly monitor the charge transfer by means of the film conductivity which experiences a sudden increase upon the deposition of the first molecular monolayer of the narrow gap material onto the wide gap semiconductor. Additionally, we investigate the transfer by ultra-violet photo-electron spectroscopy (UPS) and present first steps towards the realization of a remotely doped organic thin-film transistor.