ITEM NAME:0.5W 2V Thin Film Flexible Solar Panel Cell Battery Waterproof Power Bank #gib Store Home Promotion Hot Item Add to Fav.0.5W 2V Thin Film Flexible Solar Panel Cell Peel Stick Battery Waterproof Mini Solar Cells Power Bank. Structure type: homogenous junction solar cell. Chemical type: amorphous silicon solar cell. State of use: flat panel solar cells.