Title :
Over 18% Efficient MC-SI Solar Cells from 100% Solar Grade Silicon Feedstock from a Metallurgical Process Route
Author :
Kaes, M. ; Hahn ; Peter, K. ; Enebakk, E.
Author_Institution :
Dept. of Phys., Konstanz Univ.
Abstract :
Based on very promising results for solar cells manufactured in an industrial process reaching 16% efficiency we analyzed if solar grade (SoG) silicon feedstock is capable to match up with electronic grade silicon in high efficiency ranges. Thus we applied a reliable lab-type process on 5times5 cm2 wafers resulting in 2times2 cm2 untextured solar cells with an efficiency limit of 18.5% for floatzone (FZ) references. The 5times5 cm2 wafers were selected out of 12.5times12.5 cm2 phosphorous pregettered SoG-Si wafers characterized by lifetime measurements. The best solar cell out of 100% Elkem SoG-Si reached eta=18.1% stable efficiency certified by FhG-ISE CalLab. This is the highest value for this material reported so far
Keywords :
elemental semiconductors; metallurgy; semiconductor device manufacture; silicon; solar cells; Elkem SoG-Si; FhG-ISE CalLab; MC-Si solar cells; Si; SoG-Si wafers; electronic grade silicon; floatzone reference; industrial process; metallurgical process; phosphorous; reliable lab-type process; solar grade silicon feedstock; untextured solar cells; Costs; Electronics industry; Industrial electronics; Manufacturing industries; Manufacturing processes; Metals industry; Photovoltaic cells; Production; Refining; Silicon;
Conference_Titel :
Photovoltaic Energy Conversion, Conference Record of the 2006 IEEE 4th World Conference on
Conference_Location :
Waikoloa, HI
Print_ISBN :
1-4244-0017-1
Electronic_ISBN :
1-4244-0017-1
DOI :
10.1109/WCPEC.2006.279596
