We recently spoke to Power Roll, a British startup which has developed proprietary microgroove architecture. This technology makes Power Roll one of the most interesting perovskite companies. Asked if anyone else would start doing the same thing, CEO Neil Spann replied, “We own microgrooves for solar, our patents are absolute because it was such a new field – we own any shape, any size, the materials on either wall and any absorber material. But everyone else is going with the dogma of the sandwich arrangement for now anyway.” Power Roll’s strategy – thin-film single-junction perovskite for distributed energy applications– is familiar from several dozen other perovskite start-ups at this point. Specifically this will mainly involve non-load-bearing rooftops and BIPV, with…