Electrochemical cell structure and method of fabrication

The present invention relates to an electrochemical cell and a method of manufacturing the same. The electrochemical cell comprises a first conductive layer; a metal oxide layer formed on the first conductive layer, the metal oxide layer comprising a plurality of adjacent metal oxide cells, spaced from one another; separating means formed on the first conductive layer and surrounding each of the plurality of adjacent metal oxide cells; a functional dye layer formed on the metal oxide layer; a second conductive layer; and an electrolyte between the functional dye layer and the second conductive layer, wherein at least one of the first and second conductive layers is transparent; and the functional dye layer comprises at least two different depths of colour, such that at least some of the plurality of adjacent metal oxide cells have different depths of colour.