Copper readily forms three oxides, CuO, Cu 4 O 3 and Cu 2 O, widely recognised as the most promising p-type oxides because of their desirable optical and electrical properties and potential use in solar cells, transparent electronics as well as other specialised applications such as electrodes for rechargeable lithium batteries, catalysis and memristors. For largescale implementation of devices, magnetron sputtering is a practical method of producing metal oxides; however, sputtered copper oxides tend to form as a mixture of the oxides, with Cu 2 O being particularly difficult to produce reliably in pure form. Here, nanostructured thin films of copper oxides were prepared by a variation on reactive sputtering known as microwave-activated reactive sputtering under various rates of oxygen flow. Microwaveactivated reactive sputtering was shown to be a suitable technique for the inexpensive production of large areas of copper oxide thin films at near room temperature, facilitating deposition on a wide variety of substrates including polymers. Furthermore, it was demonstrated that the sputtered films develop through CuO, Cu4O3 and Cu2O mixed phases as oxygen flow rate is increased. The preparation of a given stoichiometry for a particular application can be achieved by varying the flow rate of oxygen during the microwave-activated reactive sputtering process.

Description Nomenclature Chemical NamesEthinyloestradiol-3-methyl ether. 1 7 a-Ethnylestradiol-3-methyl ether 3-Plethoxy-19-nor-17 a-pregna-1,3,5(10)-trien-20yn-17-01. 19-Norpregna-1,3,5(1O)-trien-2O-yn-l7-ol,3methoxy-(17a)-17a-Ethynyl-3-methoxy-1,3,5(lO)-estratrien-l7~-01. 17~-Ethynyl-3-methoxyoestra-ly3,5(lO)-trien-l7-ol. 17~t-Ethynyl-1,3,5(10)-estratriene-3, 17B-diol-3methyl ether.

, Characterisation of Cu2O/CuO thin films produced by plasma-assisted DC sputtering for solar cell application, Thin Solid Films (2017),

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