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p-i interface engineering and i-layer control of hot-wire a-Si:H based p-i-n solar cells using in-situ ellipsometry

DSpace at IIT Bombay

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Title p-i interface engineering and i-layer control of hot-wire a-Si:H based p-i-n solar cells using in-situ ellipsometry
 
Creator BAUER, S
DUSANE, RO
HERBST, W
DIEHL, F
SCHRODER, B
 
Subject amorphous-silicon
deposition method
growth
films
amorphous silicon
conversion efficiency
ellipsometry
i-v characteristics
interfaces
 
Description In this paper we report on the effect of monitoring the i-layer region near the p-i interface with the help of in-situ kinetic and spectroscopic ellipsometry on the performance of hot-wire deposited hydrogenated amorphous silicon p-i-n solar cells. It is very clearly observed that the microstructure at the p-i interface region in terms of the Si-Si bond packing density and surface roughness significantly affects the cell performance. The filament temperature, T-Fil, Was the main parameter varied to control the above mentioned two properties near the p-i interface as well as in the bulk i-layer. In order to achieve significant enhancement in the cell performance we extended the idea of the ''soft start'', earlier employed for the glow discharge deposited solar cells, to the hot-wire deposited i-layer. We were able to control the i-layer properties at the p-i interface and in the bulk independently and correlate these to the cell performance. It is shown that a major increase in cell performance can be achieved by improving the microstructure of the growing film directly at the p-i interface. Most interestingly, no significant deterioration in cell efficiency has been observed if only the p-i interface was properly controlled but the i-layer was of lower quality. These results are also shown to be consistent with model calculations of a numerical simulation. Our results therefore provide a clue to prepare hot-wire a-Si:H based solar cells with high efficiency and in the whole at high growth rates, which is needed for a more economic a-Si:H solar cell production.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-26T01:36:40Z
2011-12-26T12:52:26Z
2011-12-27T05:37:51Z
2011-07-26T01:36:40Z
2011-12-26T12:52:26Z
2011-12-27T05:37:51Z
1996
 
Type Article
 
Identifier SOLAR ENERGY MATERIALS AND SOLAR CELLS, 43(4), 413-424
0927-0248
http://dx.doi.org/10.1016/0927-0248(96)00055-4
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6848
http://hdl.handle.net/10054/6848
 
Language en