Retraction to: Journal of Materials Science: Materials in Electronics (2019) 30:832–841 https://doi.org/10.1007/s10854-018-0353-x

The Editor-in-Chief has retracted this article. After publication, concerns were raised about repeated features in the backgrounds of images representing different samples in Fig. 2. The Editor-in-Chief therefore no longer has confidence in the integrity of the data in this article.

Samira Agbolaghi has not responded to any correspondence from the editor or publisher about this retraction notice.