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Title Studies on backside Al-contact formation in Si solar cells [electronic resource] : fundamental mechanisms : preprint / B. Sopori ... [et al.].

Imprint [Golden, Colo.] : National Renewable Energy Laboratory, [2009]


Location Call No. OPAC Message Status
 Axe Federal Documents Online  E 9.17:NREL/CP-520-45001    ---  Available
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

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