Most solar cells used in homes and industry are made using thick layers of material to absorb sunlight, but have been limited in the past by relatively high costs. Many new, lower cost designs are limited as their layer of light-absorbing material is too thin to extract enough energy.
HTC's warning of hard times ahead, and says it plans to focus on cheaper phones for developing markets.
Apple's reported record iPhone and iPad sales for the quarter - but has disappointed analysts all the same, with its slowest profit growth in a decade.
Microsoft's reported its first ever quarterly loss since floating on the stock market in 1986.
Piracy accounts for almost a quarter of internet traffic worldwide, a new study has found.