A versatile light-switchable nanorod memory: Wurtzite ZnO on perovskite SrTiO3
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
KAUST Solar Center (KSC)
Laboratory of Nano Oxides for Sustainable Energy
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AbstractIntegrating materials with distinct lattice symmetries and dimensions is an effective design strategy toward realizing novel devices with unprecedented functionalities, but many challenges remain in synthesis and device design. Here, a heterojunction memory made of wurtzite ZnO nanorods grown on perovskite Nb-doped SrTiO3 (NSTO) is reported, the electronic properties of which can be drastically reconfigured by applying a voltage and light. Despite of the distinct lattice structures of ZnO and NSTO, a consistent nature of single crystallinity is achieved in the heterojunctions via the low-temperature solution-based hydrothermal growth. In addition to a high and persistent photoconductivity, the ZnO/NSTO heterojunction diode can be turned into a versatile light-switchable resistive switching memory with highly tunable ON and OFF states. The reversible modification of the effective interfacial energy barrier in the concurrent electronic and ionic processes most likely gives rise to the high susceptibility of the ZnO/NSTO heterojunction to external electric and optical stimuli. Furthermore, this facile synthesis route is promising to be generalized to other novel functional nanodevices integrating materials with diverse structures and properties. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
SponsorsThis work is partially supported by the National Research Foundation of Singapore through the Competitive Research Programme (CRP Award No. NRF-CRP-4-2008-04), the Science and Engineering Research Council, Agency for Science, Technology and Research (A*STAR) of Singapore (project No. 092 151 0088), and the National Natural Science Foundation of China (NSFC) (project Nos. 61006037 and 61076015).
JournalAdvanced Functional Materials