Publication Date:
2016-04-16
Description:
Epitaxial Cu 2 O films grown by reactive and ceramic radio frequency magnetron sputtering on single crystalline ZnO (0001) substrates are investigated. The films are grown on both O- and Zn-polar surface of the ZnO substrates. The Cu 2 O films exhibit a columnar growth manner apart from a ∼5 nm thick CuO interfacial layer. In comparison to the reactively sputtered Cu 2 O, the ceramic-sputtered films are less strained and appear to contain nanovoids. Irrespective of polarity, the Cu 2 O grown by reactive sputtering is observed to have (111)Cu 2 O||(0001)ZnO epitaxial relationship, but in the case of ceramic sputtering the films are found to show additional (110)Cu 2 O reflections when grown on O-polar surface. The observed CuO interfacial layer can be detrimental for the performance of Cu 2 O/ZnO heterojunction solar cells reported in the literature.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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