Installation of solar photovoltaic panels could go beyond rooftops into other parts of buildings as solar cell technology improves, writes Alissa Walker. The market for building-integrated photovoltaics is growing, beginning with "solar shingles" that employ copper indium gallium selenide solar cells and "thin film" solar technology. The Dow Powerhouse shingles can work on a traditional asphalt roof, while monocrystalline silicon cells and dye-sensitized solar cells allow window panes to glean energy from sunlight, according to this article.

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