TITLE:
Pulsed Supermagnetron Plasma CVD of a-CNx:H Electron-Transport Films for Au/a-CNx:H/p-Si Photovoltaic Cells
AUTHORS:
Haruhisa Kinoshita, Hiroyuki Suzuki
KEYWORDS:
a-CNx:H film, Supermagnetron Plasma, Pulsed Plasma, CVD, Photovoltaic Cell
JOURNAL NAME:
Journal of Modern Physics,
Vol.2 No.5,
May
17,
2011
ABSTRACT: Hydrogenated amorphous carbon nitride (a-CNx:H) films were formed on p-Si wafers set on a lower elec-trode by pulsed supermagnetron plasma CVD using i-C4H10 and N2 gases. Lower electrode RF power (LORF) of 13.56 MHz (50 - 800 W) was modulated by a 2.5-kHz pulse at a duty ratio of 12.5%, and upper electrode RF power (UPRF) of 50 - 400 W was supplied continuously. The optical band gap decreased with an increase in LORF at each UPRF. The open circuit voltage of Au/a-CNx:H/p-Si photovoltaic cells (a-CNx:H film thickness: 25 nm) was about 200 mV for each cell, and the short circuit current density and energy conversion efficiency increased with LORF for each UPRF. The highest energy conversion efficiency of 0.81% was obtained at UPRF/LORF of 200/800 W.