Hard XAS studies on the Chemistry and Local Structures in Some Applicative Materials

In this talk, I will show the results of X-ray absorption fine structure (XAFS) analyses on three types of condensed matter systems that show peculiar optical or electrical properties desirable for device applications. First, binary oxide + metal hetero-structures having chemically-active interfaces for resistive random access memory application. The chemistry and local structures of newly formed intermediate oxide layers at the interfaces are described [1]. Second, InP/ZnS core-shell nanostructures for solar cell application. The intermixing of core and shell ions and the role of the ZnS shell are discussed [2]. Lastly, lightly-doped (Bi,Sb)₂Te₃ for quantum devices. The structural identification of the dopants (in progress) is addressed [3].

These works have been done in collaborations with

[1] RWTH Aachen (Prof. Rainer Waser, Dr. Ilia Valov).

[2] Nanyang Technol. Univ. (Prof. Yeng Ming Lam)/ FZ Jülich (Prof. Beata Kardynal).

[3] Universität Würzburg (Dr. Thiago Peixoto)