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Enabling technologies for making GaAs-based thin-film solar cells on ceramic and polysilicon substrates

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3 Author(s)
Mauk, M.G. ; AstroPower Inc., Newark, DE, USA ; Balliet, J. ; Feyock, B.W.

We present results for the first phase of an effort to develop large-grain (>1-mm), highly-oriented, thin (0.5 to 5 micron) films of germanium on substrates of: 1. fused silica (SiO2), 2. sintered alumina (Al2O3) ceramic, or 3. low-cost polysilicon sheet (Silicon-Film™) material. We use a water-vapor mediated, close-spaced vapor transport (CSVT) process to deposit Ge, followed by a recrystallization step. An alternative chemical vapor transport process using iodine vapor is also being developed for low-cost deposition and epitaxy of Ge and GaAs. Ge films with a highly oriented texture and lateral dimensions of grains in excess of 1-mm have been achieved on fused silica, alumina ceramic, and polysilicon substrates. These structures are ultimately intended for use as Ge (coated) surrogate substrates for epitaxial growth of high-performance GaAs/InGaP solar cells.

Published in:

Photovoltaic Specialists Conference, 2002. Conference Record of the Twenty-Ninth IEEE

Date of Conference:

19-24 May 2002

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