| Description |
6 p. : digital, PDF file |
| Series |
Conference paper ; NREL/CP-520-45001 |
|
Conference paper (National Renewable Energy Laboratory (U.S.)) ; NREL/CP-520-45001.
|
| System Details |
Mode of access via the NREL web site. |
| Note |
Title from title screen (viewed February 27, 2009). |
|
"Presented at the Materials Research Society (MRS), Fall Meeting 2008, Boston, Massachusetts, December 1-5, 2008." |
|
"February 2009." |
| Summary |
We have studied mechanisms of back-contact formation in screen-printed Si solar cells by a fire-through process. An optimum firing temperature profile leads to the formation of a P-Si/P+-Si/ Si-Al eutectic/agglomerated Al at the back contact of a Si solar cell. Variations in the interface properties were found to arise from Al-Si melt instabilities. Experiments were performed to study melt formation. We show that this process is strongly controlled by diffusion of Si into Al. During the ramp-up, a melt is initiated at the Si-Al interface, which subsequently expands into Al and Si. During the ramp-down, the melt freezes, which causes the doped region to grow epitaxially on Si, followed by solidification of the Si-Al eutectic. Any agglomerated (or sintered) Al particles are dispersed with Si. Implications on the performance of the cell are described. |
| Subject |
Photovoltaic cells -- Research.
|
|
Solar cells -- Design and construction.
|
| Added Author |
Sopori, B.
|
|
National Renewable Energy Laboratory (U.S.)
|
| Gpo Item No. |
0430-P-04 (online) |
| Sudoc No. |
E 9.17:NREL/CP-520-45001 |
|
