Nowadays, the PV market is still dominated by solar panels that are based on Silicon technology. The manufacturing process to obtain c-Si solar cells has numerous phases, among which, the casting process is one of the most energy consuming. In PV production the methods of silicon casting which have achieved a strengthened industrial maturity are Czochralski (Cz) technique and Directional Solidification method (DS). Previous works have demonstrated the effectiveness of the induction heating applied to DS processes, mostly in order to improve the control and reduce the process time. In addition, appreciable results have been achieved in producing high quality multi-crystal wafer, mc-wafer, in a prototype of iDSS (induction Directional Solidification System) furnace. In this paper, the application of a magnetic field at lower frequency respect to the actual frequency applied for heating in the furnace is studied in order to analyse the flow motion of the molten Silicon inside the crucible. The goal is to increase the mixing effect and consequently to delay the formation of SiC particles and focusing the impurity concentration in the last phase of solidification. The study has been conducted on numerical models of a G2 iDSS prototype installed at the Laboratory of Electroheat of Padua University.
Effects of Superimpose Low and Medium Frequency Magnetic Fields in Induction Direction Solidification System
DUGHIERO, FABRIZIO;FORZAN, MICHELE;SEMPREBONI, NICOLA;TOLOMIO, ALESSANDRO
2015
Abstract
Nowadays, the PV market is still dominated by solar panels that are based on Silicon technology. The manufacturing process to obtain c-Si solar cells has numerous phases, among which, the casting process is one of the most energy consuming. In PV production the methods of silicon casting which have achieved a strengthened industrial maturity are Czochralski (Cz) technique and Directional Solidification method (DS). Previous works have demonstrated the effectiveness of the induction heating applied to DS processes, mostly in order to improve the control and reduce the process time. In addition, appreciable results have been achieved in producing high quality multi-crystal wafer, mc-wafer, in a prototype of iDSS (induction Directional Solidification System) furnace. In this paper, the application of a magnetic field at lower frequency respect to the actual frequency applied for heating in the furnace is studied in order to analyse the flow motion of the molten Silicon inside the crucible. The goal is to increase the mixing effect and consequently to delay the formation of SiC particles and focusing the impurity concentration in the last phase of solidification. The study has been conducted on numerical models of a G2 iDSS prototype installed at the Laboratory of Electroheat of Padua University.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
