Publication date: 8th January 2019
We developed a method to stabilize and transfer organic semiconductor nanofilms. The method is based on crosslinking of the topmost layers of organic films by low energy electron irradiation. The irradiated films, which are deposited on a dissoluble interlayer, are detached from their original substrates and subsequently deposited onto a new substrate [1]. This allows for the fabrication of highly ordered interfaces of organic 3D films and 2D materials. We demonstrate the versatility of this approach by the fabrication of ambipolar MoS2-pentacene field effect transistors. First we study transport properties in order to confirm ambipolar behaviour. Second we apply raster scanning techniques such as photocurrent microscopy and photoluminescence spectroscopy in order to study the local characteristics of such devices with submicron resolution. This technique allowed us previously to identify in unipolar devices injection barriers at contacts and trapping effects in the channel [2]. In ambipolar devices, we can probe also the generation of free carriers by exciton splitting and charge separation at the 2D/3D heterojunction. In order to excite the two materials separately, we have implemented several laser lines which match the respective absorption maxima and minimal of the 3D and 2D materials. Our initial experiments focus on pentacene and MoS2 as 3D and 2D material, however, the transfer method should also be applicable also to C60, which would open a wide range of possible hybrid p/n junctions and related devices.
1) S . J. Noever, M. Eder, F. del Giudice, J. Martin, F. Werkmeister, S. Hallwig, S. Fischer, O. Seeck, N.-E. Weber, C. Liewald, F. Keilmann, A. Turchanin, B. Nickel
Transferable organic semiconductor nanosheets for application in electronic devices
Advanced Materials (2017)
2) C. Liewald, S. Strohmair, H. Hecht, E. D. Głowackic, B. Nickel
Scanning photocurrent microscopy of electrons and holes in the pigment semiconductor epindolidione
Organic Electronics 60, 51 (2018)
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