Energy efficiency in physics is not measured the way most people think about it. Instead of asking how much heat a process ...

The past five years have seen significant cost reductions in photovoltaics and a correspondingly strong increase in uptake, with photovoltaics now positioned to provide one of the lowest-cost options ...

Humankind is facing an energy challenge: the urgent need to find a clean source of energy that is able to fulfil our growing demands for energy. Solar energy is the most promising such source because ...