Enhanced Photoresponse of Inkjet-Printed ZnO Thin Films Capped with CdS Nanoparticles

• Composite semiconductors provide routes for realizing high-performance electronic devices, but for many applications of such devices, low-cost manufacturing techniques are desirable. We have engineered a 3 orders of magnitude enhancement of the ultraviolet photoresponse of ZnO thin films, fabricated "in situ" by drop-on-demand inkjet printing, and then capped with CdS nanoparticles by dip. coating. As a consequence, the decay time of the photoresponse is. reduced to about 4 ms. Thus, capping with CdS not only suppresses the detrimental passivation layer of ZnO thin films, but also generates an interfacial carrier transport layer to reduce the probability of carrier recombination.

Nyckelord

ZINC-OXIDE

PHOTOCONDUCTIVITY

SEMICONDUCTORS

Teknisk fysik med inriktning mot fasta tillståndets fysik

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