Abstract: Accordingly, this invention provides a method for constructing a building, the method comprising: (i) providing a supporting framework; (ii)providing at least one power generation member (10), the power generation member (10) comprising, in a discrete unit, a first layer and a second layer, wherein the first layer comprises support material (30, 32, 34) and the second layer comprises at least one energy converter for converting solar energy into heat and/or electricity (12, 14); and (iii) attaching the power generation member (10) to the framework such that the power generation member (10) is substantially self supporting and provides an outer surface of the building.