Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
ZnO exhibits a wurtzite hexagonal structure and its direct optical bandgap of 3.4 eV at RT is wide enough to transmit most of the usegul solar radiation. In our previous work [1], non-doped ZnO films were successfully grown on a polyethylene terephthalate film by a conventional spray pyrolysis at 150 degree C using a diethylzinc (DEZ)-based solution under an air atomosohere. It is well known that the DEZ reacts with water and/or oxygen at low temperature, and ZnO can be generated.
In this work, novel precursor solutions were prepared by the reaction of DEZ and water in some solvent. Diethoxyethane and/or other ether solvents were used for the solution. In sample prepareation, all operations were carried out under inert gas(e.g. nitrogen). The hydrolysis reaction was carried out by addition of water to DEZ in solvent under cooling condition to remove reaction heat and avoide side reactions. Afrer aging the reaction mixture at RT for 2 hours, the novel precursor solution containing Zn-O structure compound was obtained.
A novel precursor for ZnO film deposition with Zn-O structure was synthesized by the reaction of DEZ and water in some ether solvents. Non-doped ZnO films on a glass substrate have been successfully grown by conbventional spin coating using the novel precursor solution. Strong and clear X-ray diffraction peaks of ZnO film grown by the novel precursor solution are observed to those grown by simple DEZ solution. The sample have an optical transmittance of more than 85%, and a porus surface determined from optical transmittance and scanning electron microscopy, respectively.
SEM image
Yoshino, K.; Takemoto, Y.; Oshima, M.; Toyota, K.; Inaba, K.; Haga, K.; Tokudome, K. Jpn. J. Appl. Phys. 2011, 50, 040207-1-4
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