Effects of annealing on the electro-optical properties of a-Si:H thin films deposited by D.C. and pulsed PECVD

• Main Authors: Seck, Chai Lim, Boon, Tong Goh, Abdul, Rahman Saadah
• Format: Article
• Language: English
• Published: 2004
• Subjects: QC Physics
• Online Access: http://eprints.um.edu.my/7345/1/Effects_of_annealing_on_the_electro-optical_properties_of_a-SiH_thin_films_deposited_by_D.C._and_pulsed_PECVD.pdf; http://eprints.um.edu.my/7345/

Hydrogenated amorphous silicon thin films studied in this work were prepared by d.c. and pulsed PECVD technique at a fixe d silane flow-rates of 10 sc cm and 40 sccm. The deposition temperature, pressure and power were fixed at 200 degree Celsius, 0.45 mbar and 1.4 W respectively. The pulsed PECVD system was developed from a modification of the existing d.c. PECVD system with a modulation frequency of 10 kHz. The ON-time and OFF-time was set at 30 seconds. In this work, the effects of anneal ing on the electro-optical properties of films prepared by both techniques at these flow-rates were investigated. These films were analyzed using optical absorption spectroscopy technique. The results showed that annealing had significant effects on electro-optical properties of these films at annealing temperatures above 300 degree Celsius mainly due the evolution of hydrogen. The silane flow-rate and the deposition technique also influenced the effects of annealing on the electro-optical properties of these films.