Thin-film silicon solar cells are promising candidates for meeting the
requirements of high efficiency combined with low cost. We use liquid
-phase epitaxy to grow thin silicon films on highly doped substrates.
A solar cell made on this material has been measured independently to
have an efficiency of 17.0%. An important step in obtaining these high
cell efficiencies is the removal of most of the heavily doped substra
te on which the epitaxial layer is grown.