A power generation tile comprising: a first photovoltaic material ; a first concentrator configured to reflect incident solar radiation towards the first photovoltaic material such that the first photovoltaic material experiences a greater solar flux relative to the case where the first photovoltaic material experiences unaltered solar radiation; a second photovoltaic material; and a second concentrator that is adjacently disposed to the first concentrator ; wherein: each of the first and second concentrators defines a reflective side and a non-reflective side; wherein the first photovoltaic material is disposed on the non-reflective side of the second solar concentrator and the second photovoltaic material is disposed on the non-reflective side of the first solar concentrator ; and wherein each of the non-reflective sides of the first and second solar concentrators are characterised by : a textured surface in thermal communication with the non-reflective surface of each of the first and second solar concentrators , the surface texture being provided by discrete microscale structures disposed on the surface and having characteristic dimensions between 1 μm and 100 μm, thereby operating to increase the thermal emissivity of the first and second solar concentrators . a first photovoltaic material ; a first concentrator configured to reflect incident solar radiation towards the first photovoltaic material such that the first photovoltaic material experiences a greater solar flux relative to the case where the first photovoltaic material experiences unaltered solar radiation; a second photovoltaic material; and a second concentrator that is adjacently disposed to the first concentrator ; wherein: each of the first and second concentrators defines a reflective side and a non-reflective side; wherein the first photovoltaic material is disposed on the non-reflective side of the second solar concentrator and the second photovoltaic material is disposed on the non-reflective side of the first solar concentrator ; and wherein each of the non-reflective sides of the first and second solar concentrators are characterised by : a textured surface in thermal communication with the non-reflective surface of each of the first and second solar concentrators , the surface texture being provided by discrete microscale structures disposed on the surface and having characteristic dimensions between 1 μm and 100 μm, thereby operating to increase the thermal emissivity of the first and second solar concentrators . each of the first and second concentrators defines a reflective side and a non-reflective side; wherein the first photovoltaic material is disposed on the non-reflective side of the second solar concentrator and the second photovoltaic material is disposed on the non-reflective side of the first solar concentrator ; and wherein each of the non-reflective sides of the first and second solar concentrators are characterised by : a textured surface in thermal communication with the non-reflective surface of each of the first and second solar concentrators , the surface texture being provided by discrete microscale structures disposed on the surface and having characteristic dimensions between 1 μm and 100 μm, thereby operating to increase the thermal emissivity of the first and second solar concentrators . <EOS>