Conference paper
Boron Concentration Measurements at the I/P Interface in Nip a-Si Solar Cells
The p-type Si layer in n-i-p a-Si and μc-Si solar cells on foil has several important requirements with respect to conductivity and optical transmission. We control the optical band gap and activation energy of p-a-SiC by varying the B2H6 and CH4 flows in the process chamber. Modelling shows that the optimum efficiency in n-i-p solar cells is obtained when the p-a-SiC band gap is just above the band gap of the absorber layer.
We have assessed the potential of core-loss electron energy-loss spectroscopy (EELS) for detecting B and C and of low-loss EELS, in a spatially resolved manner, as probe of local variations in bulk plasmon energy. EELS in the transmission electron microscope (TEM) combines the necessary spatial resolution to investigate the boundary between p-a-SiC and i-a-Si with sufficient sensitivity to the boron content.
Language: | English |
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Year: | 2011 |
Pages: | 2637-2640 |
Proceedings: | 26th European Photovoltaic Solar Energy Conference and Exhibition |
ISBN: | 3936338272 and 9783936338270 |
Types: | Conference paper |
DOI: | 10.4229/26thEUPVSEC2011-3AV.2.11 |