NOVELTY - Photovoltaic cell module comprises at least two serially connected photovoltaic cells on a common substrate, where cells each comprises a first electrode layer, a first charge selective layer, a light harvesting layer comprising an organic conjugated polymer, and a second charge to the first charge selective layer.    USE - The photovoltaic module is useful in solar power that is an important renewable energy source.    ADVANTAGE - The photovoltaic cell module of serially connected photovoltaic devices has a simple construction which may be adapted to any desired shape, where patterning of the layers is kept to a minimum.    DETAILED DESCRIPTION - Photovoltaic cell module comprises at least two serially connected photovoltaic cells on a common substrate, where cells each comprises a first electrode layer, a first charge selective layer, a light harvesting layer comprising an organic conjugated polymer, and a second charge to the first charge selective layer, where the first electrode layers for each cell is formed such that the first electrode layer of one cell has no direct electrical connection to the first electrode layer of any other cell, and the second charge selective layer is formed such that the second charge selective layer of one cell has no direct electrical connection to the second charge selective of any other cell, and where the light harvesting layer is formed such that it is common to at least one pair of adjacent cells of the modules; where, for at least one pair of adjacent cells to which the light harvesting layer is common, a metal is formed such that an electrical connection is established between the second charge selective layer of a first one of at least one pair of adjacent cells and the first electrode layer of a second cell of the pair, where connection is made through the light harvesting layer common to at least one pair of cells, without forming an electrical connection with the first electrode of the first cell or the second charge selective layer of the second cell. An INDEPENDENT CLAIM is a method of making a photovoltaic cell module comprising at least two serially connected photovoltaic cells on a common substrate, comprising: (a) forming a first electrode layer for each cell on the common substrate, where layer is not in direct electrical contact with the first electrode layer of any other cell; (b) forming a first charge selective layer for each cell; (c) forming a light-harvesting layer for each cell such that the same layer extends between at least one pair of adjacent cells to be serially connected, where light harvesting layer comprises an organic conjugated polymer; (d) forming a second charge selective layer that selects for an opposite charge to the first charge selective layer for each cell, where layer is not in direct electrical contact with the second charge selective layer of any other cell; and (e) forming a metal layer from a metal ink comprising a non-aqueous solvent, where layer extends between each pair of adjacent cells to be serially connected and forms an electrical connection between the second charge selective layer of a first cell of the pair and the first electrode layer of a second cell of the pair through the light harvesting layer extending between the pair of cells, without forming an electrical contact with the second charge selective layer of the second cell of the pair or with the first electrode layer of the first cell of the pair.