The first light emitting diodes using nitrogen doped ZnO nanoparticles (NPs) coated film on GZO have been demonstrated. This device showed diode characteristics in I ‐V measurement and near band edge UV electroluminescence (EL) was observed at the forward voltage of over 3 V. Only near band edge emission was observed in the EL spectrum while PL spectrum has a defect peak. This indicates the efficient exciton recombination was occurred due to the injection of high concentration holes and electrons into the NPs. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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We have investigated zeta potential measurements in order to estimate the polarization of zinc oxide (ZnO) and found that the sign and time dependence of zeta potential for ZnO{0001} wafers depend on their polarity, which is caused by an accumulation and a chemisorption of H+ or OH− counterions. The −c polarity of ZnO films on both Al2O3 and (0001) substrates was confirmed by zeta potential measurements. X-ray diffraction (XRD) and reflection high energy electron diffraction (RHEED) showed that the zeta measurements do not significantly degrade the film structure and surface morphology. These results should allow for the non-destructive determination of polarity at a lower cost and with a more understandable profile than that determined by conventional physical methods.

ZnO films on Al2O3 (112$\bar2$0) with excellent transport properties were grown using metalorganic chemical vapor deposition (MOCVD) with a high speed rotating disk and a separated showerhead. Diisopropylzinc and tert ‐butanol were used as Zn and O precursors, respectively. Hall‐effect measurements revealed that the ZnO films in this work showed a high mobility of 140 cm2/Vs and a low carrier concentration of 1.5×1017 cm–3, both of which are comparable to those grown by molecular beam epitaxy or pulsed laser deposition. This report should open a way to the mass production of single crystalline ZnO films which should be usable for optoelectronic devices. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)