Time-resolved plasma measurement in a high-power pulsed ICP source for large area

Abstract

Spatial and temporal evolution of the plasma parameters in a pulsed inductively coupled discharge for plasma source ion implantation (PSII) process was studied experimentally. Langmuir probe current and voltage measurements were performed to determine the plasma parameters. To measure the time-resolved plasma parameters automatically, data acquisition (DAQ) system was designed using a LabVIEW(R) program and interfaced to a computer with data acquisition card. Time-resolved plasma parameters consisted of two regions: RF pulse ON time and OFF time. Experiments revealed that the plasma parameters reached a steady state at about 500 mus after the RF pulse ON and they shrunk gradually after the end of the RE pulse. It was also observed that the radial and axial profiles of plasma density were uniform in large area plasma chamber at peak RF power below 20 kW. (C) 2004 Elsevier B.V. All rights reserved.