The nascent perovskite photovoltaic sector has an extreme variety of startups and approaches. Some, like Oxford PV, are developing and manufacturing a complete product from start to finish, while others develop only their particular innovation and then look to license it. For example, the UK’s Power Roll has developed a microgroove architecture, but doesn’t make its own perovskite ink – that’s left to the likes of Solaires Enterprises, one of the younger perovskite startups. In contrast to solar-grade polysilicon, perovskites are cheap, both in terms of raw materials and equipment. That doesn’t make it trivial to supply, as there’s still plenty of research to be done on what exact formulae should be used. “Perovskite” in this context refers only to…