| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014) | |
| Nanomaterials | Wednesday Sessions |
| Session NM-WeM |
| Session: | Nano Composites |
| Presenter: | Tsuyoshi Yoshitake, Kyushu University, Japan |
| Authors: | T. Yoshitake, Kyushu University, Japan Y. Katamune, Kyushu University, Japan T. Hanada, Kyushu University, Japan S. Takeichi, Kyushu University, Japan S. Ohmagari, National Institute of Advanced Industrial Science and Technology |
| Correspondent: | Click to Email |
Ultrananocrystalline diamond (UNCD)/hydrogenated amorphous carbon (a-C:H) composite (UNCD/a-C:H) films are aggregates consisting of ultrananocrystalline diamond (UNCD) grains of less than 10 nm in diameter and an a-C:H matrix [1]. In our previous study, we have realized the film growth without the pretreatment of substrates using diamond powder by pulsed laser deposition (PLD) and coaxial arc plasma deposition (CAPD), and experimentally proved the formation of p-type and n-type conductions accompanied by enhanced electrical conductivities by the doping of boron and nitrogen, respectively [2,3].
In this work, heterojunctions diodes comprising B-doped UNCD/a-C:H films and n-type Si substrates were fabricated by PLD and CAPD and they were evaluated as photodetectors. The B-doped UNCD/a-C:H showed obvious photoconduction in the UV and visible ranges. Heterojunction diodes exhibited a typical rectifying action. Photocurrent was evidently observed, and the external quantum efficiency was estimated to be more than 70% for UV monochromatic light under negative biases.
[1] T. Yoshitake et al., Jpn. J. Appl. Phys. 48, 020222 (2009).
[2] S. Ohmagari et al., Jpn. J. Appl. Phys. 50, 035101 (2011).
[3] S. Al-Riyami et al., Appl. Phys. Express, 3, 115102 (2010).