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[交流] 最新Nature nanotechnology上关于 ultraviolet photodetector的文章已有1人参与

A nanocomposite ultraviolet photodetector based
on interfacial trap-controlled charge injection
Ultraviolet photodetectors have applications in fields such as medicine, communications and defence1, and are typically made from single-crystalline silicon, silicon carbide or gallium nitride p–n junction photodiodes. However, such inorganic photodetectors are unsuitable for certain applications because of their high cost and low responsivity (<0.2 A W21)2. Solution-processed photodetectors based on organic materials and/or nanomaterials could be significantly cheaper to manu- facture, but their performance so far has been limited2–7. Here, we show that a solution-processed ultraviolet photo- detector with a nanocomposite active layer composed of ZnO nanoparticles blended with semiconducting polymers can significantly outperform inorganic photodetectors. As a result of interfacial trap-controlled charge injection, the photodetec- tor transitions from a photodiode with a rectifying Schottky contact in the dark, to a photoconductor with an ohmic contact under illumination, and therefore combines the low dark current of a photodiode and the high responsivity of a photoconductor (～721–1,001 AW21). Under a bias of <10 V, our device provides a detectivity of 3.4 3 1015 Jones at 360 nm at room temperature, which is two to three orders of magnitude higher than that of existing inorganic semiconductor ultraviolet photodetectors.

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