2017年3月1日
Application of nitrogen-doped ultrananocrystalline diamond/hydrogenated amorphous carbon composite films for ultraviolet detection
Applied Physics A: Materials Science and Processing
- ,
- ,
- 巻
- 123
- 号
- 3
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s00339-017-0798-4
© 2017, Springer-Verlag Berlin Heidelberg. Nitrogen-doped ultrananocrystalline diamond/hydrogenated amorphous carbon (UNCD/a-C:H) films were grown by coaxial arc plasma deposition in the ambient of nitrogen and hydrogen mixed gases. Synthesized films were structurally investigated by X-ray photoemission and near-edge X-ray absorption fine structure spectroscopies. A heterojunction with p-type Si substrate was fabricated to study the ultraviolet photodetection properties of the film. Capacitance–voltage measurements assure the expansion of a depletion region into the film side. Current–voltage curves in the dark showed a good rectifying behaviour in the bias voltages range between ±5 V. Under 254 nm monochromatic light, the heterojunction shows a capability of deep ultraviolet light detection, which can be attribute to the existence of UNCD grains. As the diode was cooled from 300 K down to 150 K, the detectivity has a notable enhancement from 1.94 × 105 cm Hz1/2 W−1 at 300 K to 5.11 × 1010 cm Hz1/2 W−1 at 150 K, which is mainly due to a remarkable reduction in the leakage current at low temperatures. It was experimentally demonstrated that nitrogen-doped UNCD/a-C:H film works as ultraviolet-range photovoltaic material.
- リンク情報
- ID情報
-
- DOI : 10.1007/s00339-017-0798-4
- ISSN : 0947-8396
- eISSN : 1432-0630
- SCOPUS ID : 85012988723