DataVXThe Journal of Physical Chemistry CPaper
journal article·2018-01-25Open access

Enhancement of the Sub-Band-Gap Photoconductivity in ZnO Nanowires through Surface Functionalization with Carbon Nanodots

Davide Cammi, Kseniia Zimmermann, René Gorny, Angelina Vogt, Frank Dissinger, Alaaeldin Gad, Nicolai Markiewcz, Andreas Waag, Joan Daniel Prades, Carsten Ronning, Siegfried R. Waldvogel, Tobias Voss

The Journal of Physical Chemistry C· Volume 122· Issue 3
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Source abstract

Abstract

We report on the surface functionalization of ZnO nanowire (NW) arrays by attachment of carbon nanodots (C-dots) stabilized by polyethylenimine. The photoconductive properties of the ZnO NWs/C-dots devices were investigated under photoexcitation with photon energies below and above the ZnO band gap. The results indicate an increased photoresponse of the functionalized devices in the visible spectral range, as well as enhanced UV photoconductivity. This is attributed to the fast injection of photoexcited electrons from the C-dots into the conduction band of the ZnO NWs, and the subsequent slower desorption of molecular species from the NW surface, which reduces the surface depletion region in the NWs. The surface functionalization of the ZnO NWs with carbon nanodots also impacts the dynamics of the photocurrent decay, inducing a slower relaxation of the photogenerated charge carriers.
Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: Carbon and Quantum Dots Applications · ZnO doping and properties · Ga2O3 and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Semiconductor Technology and Laboratory for Emerging Nanometrology (LENA), TU Braunschweig University of Technology, Hans-Sommer-Straße 66, D-38106 Braunschweig, Germany

Institute of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany

Inorganic Chemistry Department, National Research Centre (NRC), Cairo, Egypt

MIND, Department of Electronic & Biomedical Engineering, Universitat de Barcelona, C/Martí i Franquès 1, E-08028 Barcelona, Spain

Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, C/Martí i Franquès 1, E-08028 Barcelona, Spain

Institute of Solid State Physics, Friedrich Schiller University Jena, Max-Wien-Platz 1, D-D-07743 Jena, Germany

Funding

Deutsche Forschungsgemeinschaft · FP7 Ideas: European Research Council · Braunschweig International Graduate School of Metrology, Technische Universität Braunschweig · Serra Húnter Programme

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