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Thermal shields for heat loss reduction in Siemens-type CVD reactors
Ramos Cabal, Alba and Valdehita Torija, Javier and Zamorano Saavedra, Juan Carlos and Cañizo Nadal, Carlos del
Thermal shields for heat loss reduction in Siemens-type CVD reactors.
"Journal of Solid State Science and Technology"
||Thermal shields for heat loss reduction in Siemens-type CVD reactors
Ramos Cabal, Alba
Valdehita Torija, Javier
Zamorano Saavedra, Juan Carlos
Cañizo Nadal, Carlos del
|Título de Revista/Publicación:
||Journal of Solid State Science and Technology
||CVD reactors, Siemens process, Radiation heat loss, Polysilicon, Solar Grade Silicon
||Instituto de Energía Solar (IES) (UPM)
|UPM's Research Group:
||Silicio y Nuevos Conceptos para Células Solares
|Creative Commons Licenses:
The use of thermal shields to reduce radiation heat loss in Siemens-type CVD reactors is analyzed, both
theoretically and experimentally. The potential savings from the use of the thermal shields is first explored
using a radiation heat model that takes emissivity variations with wavelength into account, which is important for materials that do not behave as grey bodies. The theoretical calculations confirm that materials with lower surface emissivity lead to higher radiation savings. Assuming that radiation heat loss is responsible for around 50% of the total power consumption, a reduction of 32.9% and 15.5% is obtained if thermal shields with constant emissivities of 0.3 and 0.7 are considered, respectively. Experiments considering different thermal shields are conducted in a laboratory CVD reactor, confirming that the real materials do not behave as grey bodies, and proving that significant energy savings in the polysilicon deposition process are obtained.
Using silicon as a thermal shield leads to energy savings of between 26.5-28.5%. For wavelength-dependent
emissivities, the model shows that there are significant differences in radiation heat loss, of around 25%,
when compared to that of constant emissivity. The results of the model highlight the importance of having
reliable data on the emissivities within the relevant range of wavelengths, and at deposition temperatures,
which remains a pending issue.
|Government of Spain||IPT 2012-0340-120000||NATRIS||Carlos del Cañizo||Nueva era de reactores productores de triclorosilano y polisilicio para aplicaciones fotovoltaicas|
|Comunidad de Madrid||S2013/MAE-2780||MADRID-PV||Antonio Martí||An integrated program in photovoltaics devoted to promote a new generation of materials, cells and systems through the research, training, dissemination and cooperation|
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