C-axis tilted AlN films for vibration energy harvesters

H. H. Nguyen, M. Hara, H. Oguchi, H. Kuwano

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)


In this study, we reported on the sputtering growth of the c-axis tilted AlN films, which may have higher electromechanical coupling coefficient k3i than [0001]-oriented AlN, on the Si (100) substrates in the aim of high output power vibrational energy harvesters (VEHs). We implemented the incident angle deposition in a wide range of temperature from room temperature (RT) to 650°C. At 420°C the c-axis tilted 22°, which is the largest tilt angle reported for the AlN films grown by incident angle deposition. In addition, by changing growth temperature, we succeeded in preparing c-axis tilted AlN films with different tilt angle. Scanning electron spectroscopy (SEM) revealed that the c-axis tilted films have tilted columnar structures which prevents cracks and pinholes going straight through the films. This feature may help avoiding electrical short between electrodes fabricated on top and bottom of the AlN films in VEHs.

Original languageEnglish
Article number012076
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2015 Dec 10
Event15th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2015 - Boston, United States
Duration: 2015 Dec 12015 Dec 4


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