Transfer Processes of Hexagonal Crystal systems Utilizing Dissolution of ZnO/Sr<sub>3</sub>Al<sub>2</sub>O<sub>6</sub> Multilayer

We have investigated a transfer process for fabricating flexible thin films of hexagonal crystal systems. In this report, we proposed a transfer process utilizing the dissolution of ZnO and Sr3Al2O6 (SAO) multilayer, such as hydroxyapatite, on a flexible polymeric sheet. The diffraction peaks of both ZnO and SAO were clearly observed in the fabricated samples, while only the ZnO diffraction peaks were detected in the samples lifted-off from the original substrate. Furthermore, immersing the samples in a mixture of 60 vol.% methanol and 40 vol.% acetylacetone, which dissolves ZnO, resulted in the disappearance of ZnO diffraction peaks. This result indicates that the proposed process of dissolving ZnO/SAO multilayers is practical for the transfer of hexagonal crystal systems.