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Graphene Field-Effect Transistor as a High-Throughput Platform to Probe Charge Separation at Donor–Acceptor Interfaces

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journal contribution
posted on 13.03.2018, 00:00 by Bhupal Kattel, Liang Qin, Tika R. Kafle, Wai-Lun Chan
In organic and low-dimensional materials, electrons and holes are bound together to form excitons. Effective exciton dissociation at interfaces is essential for applications such as photovoltaics and photosensing. Here, we present an interface-sensitive, time-resolved method that utilizes graphene field effect transistor as an electric-field sensor to measure the charge separation dynamics and yield at donor–acceptor interfaces. Compared to other interface-sensitive spectroscopy techniques, our method has a much reduced measurement time and can be easily adapted to different material interfaces. Hence, it can be used as a high throughput screening tool to evaluate the charge separation efficiency in a large number of systems. By using zinc phthalocyanine/fullerene interface, we demonstrate how this method can be used to quantify the charge separation dynamics and yield at a typical organic donor–acceptor interface.