Minimally invasive delivery with intercellular andor intracellular localization of nano- and micro-particle solar cells within and among excitable biological cells to controllably regulate membrane polarization of such cells. The shipping label is configured complemental to the packing list whereby the packing list may first be adhered directly to the container and then the shipping label may be placed thereover. The porous film can be formed by a method including the steps of: obtaining a fired material comprising a ceramic from a ceramic precursor; obtaining ceramic particles by mechanically crushing the fired material of the ceramic; obtaining a slurry including the ceramic particles and a binder; and applying the slurry onto the surface of an electrode, followed by drying.