Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Molecular Electronics and Photonics

CPP 18.9: Vortrag

Dienstag, 8. März 2016, 11:45–12:00, H42

Conduction mechanisms in polypyrrole (PPy)/pc-ZnO heterojunctions: role of the amount of FeCl3 as oxidizing agent — •Alejandra Castro-Carranza¹, Jairo C. Nolasco², Stephanie Bley¹, Florian Meierhofer³, Lutz Mädler³, Tobias Voss⁴, and Jürgen Gutowski¹ — ¹Institute of Solid State Physics, Semiconductor Optics, University of Bremen, 28359 Bremen — ²Energy and Semiconductor Research Laboratory, Carl von Ossietzky University of Oldenburg, 26129 Oldenburg. — ³Foundation Institute of Material Science (IWT), Department of Production Engineering, University of Bremen, 28359 Bremen. — ⁴Institute of Semiconductor Technology, TU Braunschweig University of Technology, 38092 Braunschweig.

The current-voltage characteristics of p-n hybrid heterojunctions based on polypyrrole (PPy) and polycrystalline ZnO (pc-ZnO) are analyzed by means of an electrical equivalent circuit. PPy is grown by oxidative chemical vapor deposition under three different amounts of FeCl3 used as oxidizing agent. The extracted parameters, together with the observed morphology of the PPy and the turn-on voltage values of the respective devices indicate that thermionic emission of holes occurs at the PPy/pc-ZnO heterojunction. For larger FeCl3 amounts used, an increment of recombination by tunneling of carriers occurs attributed to a narrowing of the depletion region due to an increment of traps states. These physical mechanisms are discussed on a schematic band diagram.