DOI: https://doi.org/10.29363/nanoge.inform.2019.014
Publication date: 8th January 2019
Organic semiconductors are used in optoelectronic devices, such as organic light-emitting diodes, organic and perovskite solar cells, and organic field-effect transistors. The performance of such devices depends heavily on charge injection and transport. Here, we describe a universal strategy to create Ohmic contacts on organic semiconductors, even with ionization energies of up to 6 eV. The method is based on the use of an interlayer that causes electrostatic decoupling of the electrode from the semiconductor, while establishing alignment of the Fermi level with the energy levels of the organic semiconductor. This interface engineering method to create Ohmic contacts enables us to characterize charge transport in a large range of organic semiconductors. From these measurements we are able to extract important parameters, such as the charge-carrier mobility, energetic disorder and the molecular site spacing. These experimental parameters are then compared to theoretical multiscale simulations, which compute these parameters considering the molecular arrangement and electronic interaction between the molecules. Excellent agreement is found between experiment and theory, which paves the way for predictive charge-transport simulations from the molecular level. Furthermore, the use of this injection startegy will be demonstrated to create efficient organic devices.
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