Less than 5% of the world’s solar modules are made using thin film technology, but the novel idea of building integrated PV remains exciting. However, with an ever-increasing number of large corporations upping their renewables promises – it may be worth keeping an eye out for greenwashing as coating windows in solar will only go so far in slashing companies’ emissions. The remaining 95% of the market is dominated by products using either monocrystalline or polycrystalline silicon, with only minor contributions from alternative technologies like solar thermal engines or gallium arsenide. The issue with thin film is whether or not that has the potential to change at scale. Thin film, or amorphous silicon, uses Silane (SiH4) combined with a small…