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Inkjet Printed Imbedded Graphene Nanoplatelet/Zinc Oxide Bulk Heterojunctions Nanocomposite Films for Ultraviolet Photodetection

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Journal Article - Open Access

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University of Kansas Lawrence

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A ZnO solgel precursor ZnOPr and graphene nanoplatelets GnPs are mixed into a composite ink for inkjet printing photodetectors with bulk heterojunctions of ZnOGnP on a heated SiO2Si substrate. Heating of the SiO2Si wafers at 50 deg C was found optimal to prevent segregated droplets on the hydrophobic surface of the SiO2Si substrate during printing. After printing the ZnOGnP channels, thermal annealing at 350 deg C for 2 h was performed for crystallization of ZnO and formation of the ZnOGnP heterojunctions. The GnP concentration was varied from 0, 5, 20, and 30 mM to evaluate optimal formation of the ZnOGnP bulk heterojunction nanocomposites based on ultraviolet photoresponse performance. The best performance was observed at the 20 mM GnP concentration with the photoresponsivity reaching 2.2 AW at an incident ultraviolet power of 2.2 micro W and a 5 V bias. This photoresponsivity is an order of magnitude better than the previously reported counterparts, including 0.13 mAW for dropcasted ZnO-graphite composites and much higher than 0.5 AW for aerosol printed ZnO. The improved performance is attributed to the ZnOGnP bulk heterojunctions with improved interfaces that enable efficient exciton dissociation and the charge transport. The developed inkjet printing of solgel composite inks approach can be scalable and low cost for practical applications.

Subject Categories:

  • Printing and Graphic Arts
  • Miscellaneous Materials

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