Basic study on the application of ultrananocrystalline diamond/hydrogenated amorphous carbon to photodiodes

Kyushu Synchrotron Light Research Center is a member of the Kyushu Nanotechnology Network, of which the core institution is Kyushu University.

It supports nanoscale measurements and analyses of materials through the use of synchrotron radiation.

Here, we introduce a study on the fabrication and evaluation of ultrananocrystalline diamond/hydrogenated amorphous carbon composite (UNCD/a-C:H) (carried out in the laboratory of Tsuyoshi Yoshitake (associate professor) in Kyushu University), and spectroscopic evaluations performed in the Kyushu Synchrotron Light Research Center using synchrotron radiation.

The structure of the UNCD/a-C:H films fabricated in Yoshitake's laboratory was first analyzed using transmission electron microscopy (TEM), and later X-ray diffraction (XRD) with synchrotron radiation, wherein a damage caused by ion bombardment during the preparation of samples for the TEM observation can be canceled, was employed. This was the start of our collaborative study.

We then came to use X-ray photoelectron spectroscopy and near-edge X-ray absorption fine-structure (NEXAFS) using the radiation in the soft X-ray region to examine the chemical bonding structures. We have proved that these spectroscopic measurements are extremely useful for the evaluation of UNCD/a-C:H.

https://nanonet.nims.go.jp/english/magazine/?Vol.%204%2C%20No.%204%2C%202011-08-24%2FFocus%2026-20