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A high-performance organic phototransistor has been developed

Converting light into electrical signals is essential for a number of future applications, which include for example imaging, optical communication or biomedical sensing. Researchers from the University of Münster have now developed a new molecular device enabling to detect light and translate it with high efficiency to electronic-detectable current. Their work has been published in the latest issue of the journal Nature Communications.

Phototransistors are electronic components, which enable the electric current to flow ”through them” only when one of their three electrodes (called Base) is exposed to illumination of light. This is a very short explanation, although it can give you an idea how this component operates. For future applications, such as foldable electronic devices, organic phototransistors (OPTs) attract a lot of attentions due to their attractive properties including flexibility, low cost, light weight, ease of large-area processing and precise molecular engineering. So far, the development of OPTs has still lagged behind that of inorganic or hybrid materials, mainly because the low mobility of most organic photoresponsive materials limits the efficiency of transporting and collecting charge carriers.

Researchers from the Physical Institute and Center for Nanotechnology (CeNTech) in Münster, led by Prof. Dr. Harald Fuchs, have now developed together with colleagues from China a novel thin-film OPT arrays. Their approach is based on a small molecule (2, 6-diphenylanthracene (DPA), which has a strong fluorescence anthracene as the semiconducting core and phenyl groups at 2 and 6 positions of anthracene to balance the mobility and optoelectronic properties. The fabricated small-molecule OPT device shows high photosensitivity, photoresponsivity and detectivity.

“The reported values are all superior to state-of-the-art OPTs and among the best results of all previously reported phototransistors to date. At the same time, our DPA-based OPTs also show high stability in the air.”, says Dr. Deyang Li. Dr. Saeed Amirjalayer adds “By combining our experimental data with atomistic simulation, we are, in addition, able to explain the high performance of our device, which is important for a rational development of these devices.” The WWU researchers believe that, therefore, DPA offers great opportunity towards high-performance OPTs for both fundamental research and practical applications such as sensor technology or data transfer.

Source: University of Münster

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