NOVELTY - A multi-junction photovoltaic module comprises first and second photovoltaic sub-modules stacked on first photovoltaic sub-module, where first photovoltaic sub-module comprises first photovoltaic sub-cells having first and second electrodes (115, 125), are monolithically integrated on a substrate (103), where second photovoltaic sub-module comprises second photovoltaic sub-cells are monolithically integrated on second substrate; where sub-cells are identical and electrically connected in series; where photovoltaic sub-modules are electrically connected in parallel.    USE - As multi-junction photovoltaic module (claimed), such as organic multi-junction photovoltaic modules.    ADVANTAGE - The multi-junction photovoltaic module provides an (organic) photovoltaic module that is formed by stacking at least two (organic) photovoltaic sub- modules (as opposed to stacking of photovoltaic sub-cells), where problems of prior art solutions related to mismatching of the open-circuit voltage and/or mismatching of the short circuit-current of photovoltaic (sub-) cells are avoided. The photovoltaic module that the (sub-) cells within each sub-module are substantially identical, and thus are substantially current matched and voltage matched. By appropriate and independent selection of the number of (sub-) cells for each sub-module, the output voltages of the different sub-modules are made substantially equal, and thus voltage matching is easily obtained.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for fabricating multi-junction photovoltaic module involving fabricating a first photovoltaic sub-module comprising first photovoltaic sub-cells; fabricating a second photovoltaic sub-module comprising second photovoltaic sub-cells; and stacking the second photovoltaic sub-module on the first photovoltaic sub-module.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an organic photovoltaic module.    Electrical conductors (31)    Electronic device (71)    Substrate (103)    First electrode (115)    Second electrode (125)    Active layer (135)