[21p-D903-1~16] 6.4 Thin films and New materials

4:45 PM - 5:00 PM JST(7:45 AM - 8:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[21p-D903-10] Impact of lattice matching on epitaxial CuI thin films grown on fluoride substrates

〇(M1)Ryotaro Yonemushi¹, Masao Nakamura², Takahiro Yasunami¹, Yoshinori Tokura^1,2,3, Masashi Kawasaki^1,2 (1.Univ. of Tokyo, 2.RIKEN-CEMS, 3.Tokyo College)

Keywords:

wide-gap semiconductor,Iodide,mobility

CuI is a wide-bandgap semiconductor with excellent p-type conduction. We reported in the previous meeting that CuI thin films grown on CaF₂ substrate, which has good thermal expansion matching with CuI, exhibit significantly improved transport properties. However, the large lattice mismatch between CuI and CaF₂ limits the improvement of the crystallinity. In this study, we employed SrF₂ and CaF₂ as substrates, which have the same fluorite structure as CaF₂ but smaller lattice mismatch, and investigated the impact of lattice matching on the crystallinity and transport properties of the thin films.