The high sensitivity of the fabricated DPA-OPT (left) was proven by recording spatially resolved current maps using shadow masks (e.g. letter ’C’, right).
Converting light into electrical signals is essential for a number of future applications including imaging, optical communication and 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 detectable electronical current. Phototransistors are important electronic building units enabling to capture light and convert it to electrical signal. 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 headed by Harald Fuchs, have now developed together with collogues 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.
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