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The need for solar
electricity is clear. It is safe, ecologically sound, efficient, continuously
available, and it has no moving parts. The basic problem with the use of solar
photo-voltaic devices is economic, but until recently very little progress has
been made toward the development of low-cost photo-voltaic devices. The larger
part of the research funding has been devoted to study of single-crystal silicon
solar cells, despite the evidence, including that of the leading manufacturers
of crystalline silicon, that the technique holds little promise. The reason for
this pattern is understandable and historical. Crystalline silicon is the active
element in the very successful semiconductor industry, and virtually all of the
solid state devices contain silicon transistors and diodes. Crystalline silicon,
however, is particularly unsuitable to terrestrial solar cells.
Crystalline silicon solar cells work well
A. increased funding for research on amorphous materials
B. further study of the history of silicon crystals
C. increased reliance on solar energy
D. training more scientists to study energy problems