The work described in this paper includes some aspects of the long-range, high-risk research being conducted at the Solid State Photovoltaic Research Branch at SERI. The areas covered include: amorphous silicon, high efficiency, multifunction solar cells, CdS/CuInSe2 thin films, crystal growth research and solid state theory. In each of these areas specific research projects which have long-range implications are highlighted in this review.
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